diff --git a/src/PrintfFormat.java b/src/PrintfFormat.java
new file mode 100644
index 0000000..9dddeeb
--- /dev/null
+++ b/src/PrintfFormat.java
@@ -0,0 +1,13 @@
+/**
+ * @author Trevor Hartman
+ * @author Alexei Iachkov
+ * @version 1
+ * @date 1-3-24
+ */
+//identifying errors
+public class PrintfFormat {
+    public static void main(String[] args) {
+        double yarbles = 1400;
+                System.out.printf("printf %f, %d", yarbles);
+    }
+}
diff --git a/src/TempConvert.java b/src/TempConvert.java
new file mode 100644
index 0000000..e12b8b8
--- /dev/null
+++ b/src/TempConvert.java
@@ -0,0 +1,26 @@
+/**
+ * @author Trevor Hartman
+ * @author Alexei Iachkov
+ * @version 1
+ * @date 1-3-24
+ */
+//import scanner
+import java.util.Scanner;
+public class TempConvert {
+    public static void main(String[] args) {
+
+        //prompt user for input
+        System.out.print("Enter a temperature in celsius:");
+
+        //read input
+        Scanner in = new Scanner(System.in);
+
+        //convert celsius to fahrenheit
+        double celsius = in.nextDouble();
+        double fahrenheit = celsius * 9/5 + 32;
+
+        //print converted result
+        System.out.printf("%.1f C = %.1f F", celsius, fahrenheit);
+
+    }
+}
diff --git a/src/TimeConvert.java b/src/TimeConvert.java
new file mode 100644
index 0000000..4278768
--- /dev/null
+++ b/src/TimeConvert.java
@@ -0,0 +1,30 @@
+/**
+ * @author Trevor Hartman
+ * @author Alexei Iachkov
+ * @version 1
+ * @date 1-3-24
+ */
+//import scanner
+import java.util.Scanner;
+public class TimeConvert {
+    public static void main(String[] args) {
+
+        //prompt user for input
+        System.out.println("Enter a total number of seconds:");
+
+        //read input
+        Scanner in = new Scanner(System.in);
+        int total = in.nextInt();
+
+        //conversions
+        int totaltime = in.nextInt();
+        int hours = totaltime / (60*60);
+        int minutes = totaltime % (60*60) / 60;
+        int seconds = totaltime % 60;
+
+        //print converted result
+        System.out.printf("%d seconds = %d hours, %d minutes, and %d seconds", totaltime, hours, minutes, seconds);
+
+
+    }
+}
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