dsa-practice/string_reverse.c at main · alanaj77/dsa-practice · GitHub

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//string reverse using stack
#include<stdio.h>
#include <string.h>
#define MAX 15
int top1 = -1,top2=-1;
 int stack[MAX] ;
  int minStack[MAX];

void push2(int ch){
   if(top2 == MAX - 1){
    printf("Stack Overflow");
    return;
   }
   minStack[++top2] = ch;

}
void push1(int ch){
   if(top1 == MAX - 1){
    printf("Stack Overflow");
    return;
   }
   if(top1 == -1){
     push2(ch);
     //push1(ch);
      stack[++top1] = ch;
     //top1++;
   }
   else{
      stack[++top1] = ch;
      if(minStack[top2]>ch){
        push2(ch);
      }
   }


}
int pop1(){
    if(top1 == -1){
        return '\0';
    }
    else{
        return stack[top1--];
    }
}
int pop2(){
    if(top2 == -1){
        return '\0';
    }
    else{
        return minStack[top2--];
    }
}
int main()
{  //char str[MAX];
    //stack[MAX] = ;


//   while(top1 != -1 && top2 != -1){
//       temp = pop1();
//      if(temp < minStack[top2]){
//         push2(temp);
//      }
//   }
 //printf("%d ",minStack[top2]);
  push1(69);
  push1(12);
  push1(20);
  push1(1);
  printf("%d",minStack[top2]);


}