diff --git a/File handling/dat file.c b/File handling/dat file.c
new file mode 100644
index 0000000..ceeed57
--- /dev/null
+++ b/File handling/dat file.c	
@@ -0,0 +1,20 @@
+#include<stdio.h>
+struct bank
+{
+    int bookid;
+    char name[25];
+    float rate;
+};
+main()
+{
+    struct bank b1;
+    FILE *fp;
+    fp=fopen("f5.dat","wb");
+    printf("Enter bookid name and rate:\n");
+    scanf("%d",&b1.bookid);
+    fflush(stdin);
+    gets(b1.name);
+    scanf("%f",&b1.rate);
+    fwrite(&b1,sizeof(b1),1,fp);
+    fclose(fp);
+}
diff --git a/File handling/dat file.exe b/File handling/dat file.exe
new file mode 100644
index 0000000..5970554
Binary files /dev/null and b/File handling/dat file.exe differ
diff --git a/File handling/dat file.o b/File handling/dat file.o
new file mode 100644
index 0000000..c0f0d9f
Binary files /dev/null and b/File handling/dat file.o differ
diff --git a/File handling/f1.c b/File handling/f1.c
new file mode 100644
index 0000000..abb6147
--- /dev/null
+++ b/File handling/f1.c	
@@ -0,0 +1,18 @@
+#include<stdio.h>
+main()
+{
+    int i;
+    FILE *fp;
+    char str[]="Amee Computer class Batch 1 sneh";
+    fp=fopen("f1.txt","w");
+    if(fp==NULL)
+    {
+        printf("File cannot be opened.\n");
+        exit(1);
+    }
+    for(i=0;i<strlen(str);i++)
+    {
+        fputc(str[i],fp);
+    }
+    fclose(fp);
+}
diff --git a/File handling/f1.exe b/File handling/f1.exe
new file mode 100644
index 0000000..53b7f87
Binary files /dev/null and b/File handling/f1.exe differ
diff --git a/File handling/f1.o b/File handling/f1.o
new file mode 100644
index 0000000..8501ba0
Binary files /dev/null and b/File handling/f1.o differ
diff --git a/File handling/f1.txt b/File handling/f1.txt
new file mode 100644
index 0000000..7880286
--- /dev/null
+++ b/File handling/f1.txt	
@@ -0,0 +1 @@
+Amee Computer class Batch 1 sneh
\ No newline at end of file
diff --git a/File handling/f5.dat b/File handling/f5.dat
new file mode 100644
index 0000000..0fdc85b
Binary files /dev/null and b/File handling/f5.dat differ
diff --git a/File handling/fputs.c b/File handling/fputs.c
new file mode 100644
index 0000000..7b74f62
--- /dev/null
+++ b/File handling/fputs.c	
@@ -0,0 +1,16 @@
+#include<stdio.h>
+main()
+{
+    char ch[20];
+    FILE *fp;
+    fp=fopen("juju1.txt","w");
+    if(fp==NULL)
+    {
+        printf("File not found.\n");
+        exit(1);
+    }
+    printf("Enter string:\n");
+    gets(ch);
+    fputs(ch,fp);
+    fclose(fp);
+}
diff --git a/File handling/fputs.exe b/File handling/fputs.exe
new file mode 100644
index 0000000..52d28b4
Binary files /dev/null and b/File handling/fputs.exe differ
diff --git a/File handling/fputs.o b/File handling/fputs.o
new file mode 100644
index 0000000..d0de9d3
Binary files /dev/null and b/File handling/fputs.o differ
diff --git a/File handling/juju.txt b/File handling/juju.txt
new file mode 100644
index 0000000..3d3a8ee
--- /dev/null
+++ b/File handling/juju.txt	
@@ -0,0 +1 @@
+Sneh chauhan
diff --git a/File handling/juju1.txt b/File handling/juju1.txt
new file mode 100644
index 0000000..c9cf76b
--- /dev/null
+++ b/File handling/juju1.txt	
@@ -0,0 +1 @@
+snehchauhan
\ No newline at end of file
diff --git a/File handling/reading from a file using fgets.c b/File handling/reading from a file using fgets.c
new file mode 100644
index 0000000..d590cf3
--- /dev/null
+++ b/File handling/reading from a file using fgets.c	
@@ -0,0 +1,18 @@
+/*To read from a file using fgets() */
+#include<stdio.h>
+main()
+{
+    char ch[20];
+    FILE *fp;
+    fp=fopen("juju.txt","r");
+    if(fp==NULL)
+    {
+        printf("File not found.\n");
+        exit(1);
+    }
+    while(fgets(ch,8,fp)!=NULL)
+    {
+        printf("%s",ch);
+    }
+    fclose(fp);
+}
diff --git a/File handling/reading from a file using fgets.exe b/File handling/reading from a file using fgets.exe
new file mode 100644
index 0000000..f3e3e3a
Binary files /dev/null and b/File handling/reading from a file using fgets.exe differ
diff --git a/File handling/reading from a file using fgets.o b/File handling/reading from a file using fgets.o
new file mode 100644
index 0000000..32e5b67
Binary files /dev/null and b/File handling/reading from a file using fgets.o differ
diff --git a/File handling/sns.c b/File handling/sns.c
new file mode 100644
index 0000000..3b2239e
--- /dev/null
+++ b/File handling/sns.c	
@@ -0,0 +1,19 @@
+#include<stdio.h>
+main()
+{
+    char ch;
+    FILE *fp;
+    fp=fopen("juju.txt","r");
+    if(fp==NULL)
+    {
+        printf("File not found.\n");
+        exit(0);
+    }
+    ch=fgetc(fp);
+    while(!feof(fp))
+    {
+        printf("%c",ch);
+        ch=fgetc(fp);               //Recursion
+    }
+    fclose(fp);
+}
diff --git a/File handling/sns.exe b/File handling/sns.exe
new file mode 100644
index 0000000..e0c2263
Binary files /dev/null and b/File handling/sns.exe differ
diff --git a/File handling/sns.o b/File handling/sns.o
new file mode 100644
index 0000000..11b400f
Binary files /dev/null and b/File handling/sns.o differ
diff --git a/Functions/areaofcircle.c b/Functions/areaofcircle.c
new file mode 100644
index 0000000..7625bc3
--- /dev/null
+++ b/Functions/areaofcircle.c
@@ -0,0 +1,17 @@
+#include<stdio.h>
+#define PI 3.14
+float areac(float);
+int main()
+{
+    float r;
+    printf("Enter the radius of Circle:\n");
+    scanf("%f",&r);
+    printf("The Area of the circle with radius %f is: %f",r,areac(r));
+    return 0;
+}
+float areac(float r)
+{
+    float z;
+    z=PI*r*r;
+    return z;
+}
diff --git a/Functions/areaofcircle.exe b/Functions/areaofcircle.exe
new file mode 100644
index 0000000..137e814
Binary files /dev/null and b/Functions/areaofcircle.exe differ
diff --git a/Functions/areaofcircle.o b/Functions/areaofcircle.o
new file mode 100644
index 0000000..62f5c75
Binary files /dev/null and b/Functions/areaofcircle.o differ
diff --git a/Functions/dectobin.c b/Functions/dectobin.c
new file mode 100644
index 0000000..8a542ed
--- /dev/null
+++ b/Functions/dectobin.c
@@ -0,0 +1,23 @@
+#include<stdio.h>
+int dec(int);
+main()
+{
+    int x,i;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    dec(x);
+}
+int dec(x)
+{
+    int i,bin[15];
+    for(i=0;i<15;i++)
+    {
+        bin[i]=x%2;
+        x=x/2;
+    }
+     printf("The Binary value is:\n");
+    for(i=14;i>=0;i--)
+    {
+         printf("%d",bin[i]);
+    }
+}
diff --git a/Functions/dectobin.exe b/Functions/dectobin.exe
new file mode 100644
index 0000000..7ea176c
Binary files /dev/null and b/Functions/dectobin.exe differ
diff --git a/Functions/dectobin.o b/Functions/dectobin.o
new file mode 100644
index 0000000..069e8ad
Binary files /dev/null and b/Functions/dectobin.o differ
diff --git a/Functions/factorial.c b/Functions/factorial.c
new file mode 100644
index 0000000..4219b3f
--- /dev/null
+++ b/Functions/factorial.c
@@ -0,0 +1,20 @@
+#include<stdio.h>
+int fact(int x);
+int main()
+{
+    int x;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    //z=fact(x);
+    printf("The factorial of x is :%d",fact(x));
+    return 0;
+}
+int fact(int x)
+{
+    int i,fact=1;
+    for(i=x;i>=1;i--)
+    {
+        fact*=i;
+    }
+    return fact;
+}
diff --git a/Functions/factorial.exe b/Functions/factorial.exe
new file mode 100644
index 0000000..16dd29c
Binary files /dev/null and b/Functions/factorial.exe differ
diff --git a/Functions/factorial.o b/Functions/factorial.o
new file mode 100644
index 0000000..642bb68
Binary files /dev/null and b/Functions/factorial.o differ
diff --git a/Functions/factors.c b/Functions/factors.c
new file mode 100644
index 0000000..54f75ee
--- /dev/null
+++ b/Functions/factors.c
@@ -0,0 +1,21 @@
+#include<stdio.h>
+void factors(int);
+main()
+{
+    int x;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    factors(x);
+}
+void factors(int x)
+{
+    int i;
+    for(i=1;i<=x;i++)
+    {
+        if(x%i==0)
+        {
+            printf("%d",i);
+        }
+
+    }
+}
diff --git a/Functions/factors.exe b/Functions/factors.exe
new file mode 100644
index 0000000..766e367
Binary files /dev/null and b/Functions/factors.exe differ
diff --git a/Functions/factors.o b/Functions/factors.o
new file mode 100644
index 0000000..ec8189d
Binary files /dev/null and b/Functions/factors.o differ
diff --git a/Functions/functions.c b/Functions/functions.c
new file mode 100644
index 0000000..c784936
--- /dev/null
+++ b/Functions/functions.c
@@ -0,0 +1,28 @@
+#include<stdio.h>
+void italy();
+void germany();
+void india();
+
+main()
+{
+    printf("I am in main.\n");
+    italy();
+    printf("I am back in main.\n");
+}
+void italy()
+{
+    printf("I am in  ITALY.\n");
+    germany();
+    printf("I am back in ITALY.\n");
+}
+void germany()
+{
+    printf("I am in GERMANY.\n");
+    india();
+    printf("I am back in GERMANY.\n");
+}
+void india()
+{
+    printf("I am in INDIA.\n");
+}
+
diff --git a/Functions/functions.exe b/Functions/functions.exe
new file mode 100644
index 0000000..d9ebde5
Binary files /dev/null and b/Functions/functions.exe differ
diff --git a/Functions/functions.o b/Functions/functions.o
new file mode 100644
index 0000000..b56b9ca
Binary files /dev/null and b/Functions/functions.o differ
diff --git a/Functions/functions1.c b/Functions/functions1.c
new file mode 100644
index 0000000..9f183f5
--- /dev/null
+++ b/Functions/functions1.c
@@ -0,0 +1,17 @@
+#include<stdio.h>
+main()
+{
+    int sum(int x,int y);
+    int x,y,s;
+    printf("Enter x:\n");
+    scanf("%d",&x);
+    printf("Enter y:\n");
+    scanf("%d",&y);
+    s=sum(x,y);
+    printf("The sum is %d.\n",s);
+}
+sum(a,b)
+{
+    int z;
+    z=a+b;
+}
diff --git a/Functions/functions1.exe b/Functions/functions1.exe
new file mode 100644
index 0000000..3510402
Binary files /dev/null and b/Functions/functions1.exe differ
diff --git a/Functions/functions1.o b/Functions/functions1.o
new file mode 100644
index 0000000..ce0672e
Binary files /dev/null and b/Functions/functions1.o differ
diff --git a/Functions/lcm.c b/Functions/lcm.c
new file mode 100644
index 0000000..fbe54d2
--- /dev/null
+++ b/Functions/lcm.c
@@ -0,0 +1,29 @@
+#include<stdio.h>
+int lcm(int,int);
+main()
+{
+    int x,y;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    printf("Enter the value of y:\n");
+    scanf("%d",&y);
+    if(x<y)
+    {
+        x=x+y;
+        y=x-y;
+        x=x-y;
+
+    }
+    printf("The lcm of x and y is %d.\n",lcm(x,y));
+}
+int lcm(int x,int y)
+{
+    int i;
+    for(i=x;;i++)
+    {
+        if(i%x==0&&i%y==0)
+        {
+            return i;
+        }
+    }
+}
diff --git a/Functions/lcm.exe b/Functions/lcm.exe
new file mode 100644
index 0000000..23d416a
Binary files /dev/null and b/Functions/lcm.exe differ
diff --git a/Functions/lcm.o b/Functions/lcm.o
new file mode 100644
index 0000000..520f5c0
Binary files /dev/null and b/Functions/lcm.o differ
diff --git a/Functions/multiply2values.c b/Functions/multiply2values.c
new file mode 100644
index 0000000..f803bef
--- /dev/null
+++ b/Functions/multiply2values.c
@@ -0,0 +1,19 @@
+/*Use of functions*/
+#include<stdio.h>
+int sum(int,int);
+main()
+{
+    int x,y,a;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    printf("Enter the value of y:\n");
+    scanf("%d",&y);
+    a=sum(x,y);
+    printf("The sum of x and y is %d.\n",a);
+}
+ int sum(int x,int y)
+{
+    int z;
+    z=x*y;
+    return z;
+}
diff --git a/Functions/multiply2values.exe b/Functions/multiply2values.exe
new file mode 100644
index 0000000..996d71c
Binary files /dev/null and b/Functions/multiply2values.exe differ
diff --git a/Functions/multiply2values.o b/Functions/multiply2values.o
new file mode 100644
index 0000000..eae93cd
Binary files /dev/null and b/Functions/multiply2values.o differ
diff --git a/Functions/oddoreven.c b/Functions/oddoreven.c
new file mode 100644
index 0000000..364ef79
--- /dev/null
+++ b/Functions/oddoreven.c
@@ -0,0 +1,17 @@
+#include<stdio.h>
+int check(int);
+int main()
+{
+    int x;
+    printf("Enter the number:\n");
+    scanf("%d",&x);
+    return check(x);
+}
+int check(int x)
+{
+    int i;
+    if(x%2==0)
+        return 1;
+    else
+        return 0;
+}
diff --git a/Functions/oddoreven.exe b/Functions/oddoreven.exe
new file mode 100644
index 0000000..719c683
Binary files /dev/null and b/Functions/oddoreven.exe differ
diff --git a/Functions/oddoreven.o b/Functions/oddoreven.o
new file mode 100644
index 0000000..23eef43
Binary files /dev/null and b/Functions/oddoreven.o differ
diff --git a/Functions/primeornot.c b/Functions/primeornot.c
new file mode 100644
index 0000000..8856cf9
--- /dev/null
+++ b/Functions/primeornot.c
@@ -0,0 +1,24 @@
+#include<stdio.h>
+int prime(int);
+main()
+{
+    int x,z;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    z=prime(x);
+    if(z==1)
+        printf("The number is not a prime number.\n");
+    else
+        printf("The number is a prime number.\n");
+}
+int prime(int x)
+{
+    int num;
+    for(int i=2;i<=x-1;i++)
+    {
+        if(x%i==0)
+            return 1;
+        else
+            return 0;
+    }
+}
diff --git a/Functions/primeornot.exe b/Functions/primeornot.exe
new file mode 100644
index 0000000..3490b03
Binary files /dev/null and b/Functions/primeornot.exe differ
diff --git a/Functions/primeornot.o b/Functions/primeornot.o
new file mode 100644
index 0000000..1fcdc45
Binary files /dev/null and b/Functions/primeornot.o differ
diff --git a/Functions/printnaturalnos.c b/Functions/printnaturalnos.c
new file mode 100644
index 0000000..de7306c
--- /dev/null
+++ b/Functions/printnaturalnos.c
@@ -0,0 +1,16 @@
+#include<stdio.h>
+int numbers(int);
+int main()
+{
+    int x;
+    printf("Enter the number upto which you want to print the numbers from 1:\n");
+    scanf("%d",&x);
+    numbers(x);
+    return 0;
+}
+int numbers(int x)
+{
+    int i;
+    for(i=1;i<=x;i++)
+        printf("%d\t",i);
+}
diff --git a/Functions/printnaturalnos.exe b/Functions/printnaturalnos.exe
new file mode 100644
index 0000000..9e68ae1
Binary files /dev/null and b/Functions/printnaturalnos.exe differ
diff --git a/Functions/printnaturalnos.o b/Functions/printnaturalnos.o
new file mode 100644
index 0000000..e5f1245
Binary files /dev/null and b/Functions/printnaturalnos.o differ
diff --git a/Functions/sumof2numbers.c b/Functions/sumof2numbers.c
new file mode 100644
index 0000000..3054dd5
--- /dev/null
+++ b/Functions/sumof2numbers.c
@@ -0,0 +1,20 @@
+/*Use of functions*/
+#include<stdio.h>
+main()
+{
+    float sum(float,float);
+    float x,y,a;
+    printf("Enter the value of x:\n");
+    scanf("%f",&x);
+    printf("Enter the value of y:\n");
+    scanf("%f",&y);
+     a=x+y;
+    a=sum(x,y);
+    printf("The sum of x and y is %f.\n",a);
+}
+float sum(float x,float y)
+{
+    float z;
+    z=x+y;
+    return z;
+}
diff --git a/Functions/sumof2numbers.exe b/Functions/sumof2numbers.exe
new file mode 100644
index 0000000..0be5028
Binary files /dev/null and b/Functions/sumof2numbers.exe differ
diff --git a/Recursion/factorial.c b/Recursion/factorial.c
new file mode 100644
index 0000000..5a97099
--- /dev/null
+++ b/Recursion/factorial.c
@@ -0,0 +1,19 @@
+#include<stdio.h>
+int sum(int);
+main()
+{
+   int x,z;
+   printf("Enter the value of x:\n");
+   scanf("%d",&x);
+   z=sum(x);
+   printf("The sum of %d numbers is %d.\n",x,z);
+}
+int sum(int a)
+{
+    int s;
+    if(a==1)
+        return(a);
+    s=a*sum(a-1);
+    return(s);
+}
+
diff --git a/Recursion/factorial.exe b/Recursion/factorial.exe
new file mode 100644
index 0000000..569e13b
Binary files /dev/null and b/Recursion/factorial.exe differ
diff --git a/Recursion/factorial.o b/Recursion/factorial.o
new file mode 100644
index 0000000..79c55bc
Binary files /dev/null and b/Recursion/factorial.o differ
diff --git a/Recursion/gcd.c b/Recursion/gcd.c
new file mode 100644
index 0000000..054f16a
--- /dev/null
+++ b/Recursion/gcd.c
@@ -0,0 +1,22 @@
+#include<stdio.h>
+int gcd(int,int);
+int min;
+main()
+{
+    int x,y;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    printf("Enter the value of y:\n");
+    scanf("%d",&y);
+    min=x>y?y:x;
+    printf("The GCD of %d and %d is %d.\n",x,y,gcd(x,y));
+}
+int gcd(int a,int b)
+{
+    if(a%min==0&&b%min==0)
+    {
+        return min;
+    }
+    min--;
+    gcd(a,b);
+}
diff --git a/Recursion/gcd.exe b/Recursion/gcd.exe
new file mode 100644
index 0000000..66203cb
Binary files /dev/null and b/Recursion/gcd.exe differ
diff --git a/Recursion/gcd.o b/Recursion/gcd.o
new file mode 100644
index 0000000..c32152f
Binary files /dev/null and b/Recursion/gcd.o differ
diff --git a/Recursion/lcm.c b/Recursion/lcm.c
new file mode 100644
index 0000000..208301e
--- /dev/null
+++ b/Recursion/lcm.c
@@ -0,0 +1,22 @@
+#include<stdio.h>
+int  lcm(int,int);
+main()
+{
+    int x,y,ans;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    printf("Enter the value of y:\n");
+    scanf("%d",&y);
+    ans=lcm(x,y);
+    printf("The lcm of %d and %d is %d.\n",x,y,ans);
+}
+int lcm(int a,int b)
+{
+    static int comm=1;//value of comm remains present till the end of programs i.e it doesn't get overwrite.
+    if(comm%a==0&&comm%b==0)
+   {
+      return comm;
+   }
+   comm++;
+   lcm(a,b);
+}
diff --git a/Recursion/lcm.exe b/Recursion/lcm.exe
new file mode 100644
index 0000000..6935139
Binary files /dev/null and b/Recursion/lcm.exe differ
diff --git a/Recursion/lcm.o b/Recursion/lcm.o
new file mode 100644
index 0000000..7ce0fe7
Binary files /dev/null and b/Recursion/lcm.o differ
diff --git a/Recursion/lcm1.c b/Recursion/lcm1.c
new file mode 100644
index 0000000..6303d29
--- /dev/null
+++ b/Recursion/lcm1.c
@@ -0,0 +1,23 @@
+#include<stdio.h>
+int lcm(int,int);
+int max;
+main()
+{
+    int x,y,z;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    printf("Enter the value of y:\n");
+    scanf("%d",&y);
+    max=x>y?x:y;
+    z=lcm(x,y);
+    printf("The lcm of %d and %d is %d.\n",x,y,z);
+}
+int lcm(int a,int b)
+{
+    if(max%a==0&&max%b==0)
+    {
+        return max;
+    }
+    max++;
+    lcm(a,b);
+}
diff --git a/Recursion/lcm1.exe b/Recursion/lcm1.exe
new file mode 100644
index 0000000..50a2e25
Binary files /dev/null and b/Recursion/lcm1.exe differ
diff --git a/Recursion/lcm1.o b/Recursion/lcm1.o
new file mode 100644
index 0000000..537d885
Binary files /dev/null and b/Recursion/lcm1.o differ
diff --git a/Recursion/power.c b/Recursion/power.c
new file mode 100644
index 0000000..a54ae53
--- /dev/null
+++ b/Recursion/power.c
@@ -0,0 +1,21 @@
+#include<stdio.h>
+int power(int,int);
+main()
+{
+    int x,y,z;
+    printf("Enter the value of x:\n");
+    scanf("%d",&x);
+    printf("Enter the value of y:\n");
+    scanf("%d",&y);
+    z=power(x,y);
+    printf("The answer is %d.",z);
+}
+int power(int a,int b)
+{
+    int s;
+    if(b==1)
+        return a;
+    s=a*power(a,b-1);
+    return s;
+}
+
diff --git a/Recursion/power.exe b/Recursion/power.exe
new file mode 100644
index 0000000..e2b1c0c
Binary files /dev/null and b/Recursion/power.exe differ
diff --git a/Recursion/power.o b/Recursion/power.o
new file mode 100644
index 0000000..f0dc484
Binary files /dev/null and b/Recursion/power.o differ
diff --git a/Recursion/sumofn.c b/Recursion/sumofn.c
new file mode 100644
index 0000000..a81b61b
--- /dev/null
+++ b/Recursion/sumofn.c
@@ -0,0 +1,18 @@
+#include<stdio.h>
+int sum(int);
+main()
+{
+   int x,z;
+   printf("Enter the value of x:\n");
+   scanf("%d",&x);
+   z=sum(x);
+   printf("The sum of %d numbers is %d.\n",x,z);
+}
+int sum(int a)
+{
+    int s;
+    if(a==1)
+        return(a);
+    s=a+sum(a-1);
+    return(s);
+}
diff --git a/Recursion/sumofn.exe b/Recursion/sumofn.exe
new file mode 100644
index 0000000..f61fc76
Binary files /dev/null and b/Recursion/sumofn.exe differ
diff --git a/Recursion/sumofn.o b/Recursion/sumofn.o
new file mode 100644
index 0000000..13bd5b9
Binary files /dev/null and b/Recursion/sumofn.o differ
diff --git a/Stringfunctions/strcat.c b/Stringfunctions/strcat.c
new file mode 100644
index 0000000..7792375
--- /dev/null
+++ b/Stringfunctions/strcat.c
@@ -0,0 +1,12 @@
+#include<stdio.h>
+main()
+{
+    int i;
+    char c[20],s[20];
+    printf("Enter the string 1:\n");
+    gets(c);
+    printf("Enter the string 2:\n");
+    gets(s);
+    printf("The new combined string is %s.\n",strcat(c,s));
+}
+
diff --git a/Stringfunctions/strcat.exe b/Stringfunctions/strcat.exe
new file mode 100644
index 0000000..71bdf94
Binary files /dev/null and b/Stringfunctions/strcat.exe differ
diff --git a/Stringfunctions/strcat.o b/Stringfunctions/strcat.o
new file mode 100644
index 0000000..59e89d7
Binary files /dev/null and b/Stringfunctions/strcat.o differ
diff --git a/Stringfunctions/strcmp.c b/Stringfunctions/strcmp.c
new file mode 100644
index 0000000..5dc0b6a
--- /dev/null
+++ b/Stringfunctions/strcmp.c
@@ -0,0 +1,15 @@
+#include<stdio.h>
+main()
+{
+    int i;
+    char c[20],s[20];
+    printf("Enter the string 1:\n");
+    gets(c);
+    printf("Enter the string 2:\n");
+    gets(s);
+    i=strcmp(s,c);
+    if(i==0)
+        printf("The strings are same.\n");
+    else
+        printf("The strings are different.\n");
+}
diff --git a/Stringfunctions/strcmp.exe b/Stringfunctions/strcmp.exe
new file mode 100644
index 0000000..165ec3a
Binary files /dev/null and b/Stringfunctions/strcmp.exe differ
diff --git a/Stringfunctions/strcmp.o b/Stringfunctions/strcmp.o
new file mode 100644
index 0000000..2f023c1
Binary files /dev/null and b/Stringfunctions/strcmp.o differ
diff --git a/Stringfunctions/strcpy.c b/Stringfunctions/strcpy.c
new file mode 100644
index 0000000..1b0ada3
--- /dev/null
+++ b/Stringfunctions/strcpy.c
@@ -0,0 +1,8 @@
+#include<stdio.h>
+main()
+{
+    char c[20],s[20];
+    printf("Enter the string:\n");
+    gets(c);
+    printf("The string is %s.",strcpy(s,c));
+}
diff --git a/Stringfunctions/strcpy.exe b/Stringfunctions/strcpy.exe
new file mode 100644
index 0000000..4323a62
Binary files /dev/null and b/Stringfunctions/strcpy.exe differ
diff --git a/Stringfunctions/strcpy.o b/Stringfunctions/strcpy.o
new file mode 100644
index 0000000..3424133
Binary files /dev/null and b/Stringfunctions/strcpy.o differ
diff --git a/Stringfunctions/strlen.c b/Stringfunctions/strlen.c
new file mode 100644
index 0000000..1a2b77d
--- /dev/null
+++ b/Stringfunctions/strlen.c
@@ -0,0 +1,8 @@
+#include<stdio.h>
+main()
+{
+    char c[20];
+    printf("Enter the String:\n");
+    gets(c);
+    printf("The length of the Inputted String is %d.\n",strlen(c));
+}
diff --git a/Stringfunctions/strlen.exe b/Stringfunctions/strlen.exe
new file mode 100644
index 0000000..246d962
Binary files /dev/null and b/Stringfunctions/strlen.exe differ
diff --git a/Stringfunctions/strlen.o b/Stringfunctions/strlen.o
new file mode 100644
index 0000000..6792572
Binary files /dev/null and b/Stringfunctions/strlen.o differ
diff --git a/Stringfunctions/strlwr.c b/Stringfunctions/strlwr.c
new file mode 100644
index 0000000..72bd264
--- /dev/null
+++ b/Stringfunctions/strlwr.c
@@ -0,0 +1,8 @@
+#include<stdio.h>
+main()
+{
+    char c[20];
+    printf("Enter the string:\n");
+    gets(c);
+    printf("The string in lower case is: %s\n",strlwr(c));
+}
diff --git a/Stringfunctions/strlwr.exe b/Stringfunctions/strlwr.exe
new file mode 100644
index 0000000..7a9ac7e
Binary files /dev/null and b/Stringfunctions/strlwr.exe differ
diff --git a/Stringfunctions/strlwr.o b/Stringfunctions/strlwr.o
new file mode 100644
index 0000000..9d5cb6d
Binary files /dev/null and b/Stringfunctions/strlwr.o differ
diff --git a/Stringfunctions/strrev.c b/Stringfunctions/strrev.c
new file mode 100644
index 0000000..530c1be
--- /dev/null
+++ b/Stringfunctions/strrev.c
@@ -0,0 +1,8 @@
+#include<stdio.h>
+main()
+{
+    char c[20];
+    printf("Enter the string:\n");
+    gets(c);
+    printf("The reverse is %s.",strrev(c));
+}
diff --git a/Stringfunctions/strrev.exe b/Stringfunctions/strrev.exe
new file mode 100644
index 0000000..0ffdb40
Binary files /dev/null and b/Stringfunctions/strrev.exe differ
diff --git a/Stringfunctions/strrev.o b/Stringfunctions/strrev.o
new file mode 100644
index 0000000..8e08d59
Binary files /dev/null and b/Stringfunctions/strrev.o differ
diff --git a/Stringfunctions/strupr.c b/Stringfunctions/strupr.c
new file mode 100644
index 0000000..8ee87a5
--- /dev/null
+++ b/Stringfunctions/strupr.c
@@ -0,0 +1,9 @@
+#include<stdio.h>
+main()
+{
+    char c[20];
+    printf("Enter the string:\n");
+    gets(c);
+    printf("The string in upper case is: %s\n",strupr(c));
+}
+
diff --git a/Stringfunctions/strupr.exe b/Stringfunctions/strupr.exe
new file mode 100644
index 0000000..9d1871d
Binary files /dev/null and b/Stringfunctions/strupr.exe differ
diff --git a/Stringfunctions/strupr.o b/Stringfunctions/strupr.o
new file mode 100644
index 0000000..e1a563a
Binary files /dev/null and b/Stringfunctions/strupr.o differ
diff --git a/stringwithoutfunctions/comparestring.c b/stringwithoutfunctions/comparestring.c
new file mode 100644
index 0000000..d24ce8d
--- /dev/null
+++ b/stringwithoutfunctions/comparestring.c
@@ -0,0 +1,30 @@
+#include<stdio.h>
+main()
+{
+    int i,flag=0,m,n;
+    char c[20],s[20];
+    printf("Enter string 1:\n");
+    gets(c);
+    printf("Enter string 2:\n");
+    gets(s);
+    m=strlen(c);
+    n=strlen(s);
+    if(m==n)
+    {
+          for(i=0;s[i]!='\0';i++)
+          {
+              if(s[i]==c[i])
+              {
+                flag=1;
+              }
+              else
+               {
+                break;
+               }
+          }
+    }
+    if(flag==0)
+        printf("The strings are not equal.\n");
+    else
+        printf("The strings are equal.\n");
+}
diff --git a/stringwithoutfunctions/comparestring.exe b/stringwithoutfunctions/comparestring.exe
new file mode 100644
index 0000000..66b1d16
Binary files /dev/null and b/stringwithoutfunctions/comparestring.exe differ
diff --git a/stringwithoutfunctions/comparestring.o b/stringwithoutfunctions/comparestring.o
new file mode 100644
index 0000000..d358197
Binary files /dev/null and b/stringwithoutfunctions/comparestring.o differ
diff --git a/stringwithoutfunctions/copystring.c b/stringwithoutfunctions/copystring.c
new file mode 100644
index 0000000..8f1f755
--- /dev/null
+++ b/stringwithoutfunctions/copystring.c
@@ -0,0 +1,16 @@
+#include<stdio.h>
+main()
+{
+    int i;
+    char c[20],s[20];
+    printf("Enter the string 1:\n");
+    gets(c);
+    for(i=0;c[i]!='\0';i++)
+    {
+        s[i]=c[i];
+    }
+    s[i]='\0';
+    puts(s);
+
+}
+
diff --git a/stringwithoutfunctions/copystring.exe b/stringwithoutfunctions/copystring.exe
new file mode 100644
index 0000000..c8065aa
Binary files /dev/null and b/stringwithoutfunctions/copystring.exe differ
diff --git a/stringwithoutfunctions/copystring.o b/stringwithoutfunctions/copystring.o
new file mode 100644
index 0000000..ec4d881
Binary files /dev/null and b/stringwithoutfunctions/copystring.o differ
diff --git a/stringwithoutfunctions/copystring2.c b/stringwithoutfunctions/copystring2.c
new file mode 100644
index 0000000..7971046
--- /dev/null
+++ b/stringwithoutfunctions/copystring2.c
@@ -0,0 +1,21 @@
+#include<stdio.h>
+main()
+{
+    int i;
+    char c[20],s[20];
+    printf("Enter the string 1:\n");
+    gets(c);
+    for(i=0;c[i]!='\0';i++)
+    {
+        s[i]=c[i];
+    }
+    s[i]='\0';
+    for(i=0;s[i]!='\0';i++)                                 //method1
+    {
+        printf("%c",s[i]);
+    }
+    printf("\n");
+    printf("%s\n",s);                                       //method 2
+
+    puts(s);                                                //method 3
+}