refactoring: Extracted all the operations from the programmingMode and move them into performOperation

src/main/c/programmingMode.c

@@ -5,6 +5,27 @@
 
 #include "taschenrechner.h"
 
+// Calculation
+int performOperation(int num1, char operator, int num2) {
+    switch (operator) {
+        case '+':
+            return num1 + num2;
+        case '-':
+            return num1 - num2;
+        case '*':
+            return num1 * num2;
+        case '/':
+            if (num2 != 0) {
+                return num1 / num2;
+            } else {
+                printf("Error: Division by zero\n");
+                return 0;
+            }
+        default:
+            printf("Invalid operator\n");
+            return 0;
+    }
+}
 
 void programmingMode() {
     int num1, num2, result;
@@ -19,30 +40,9 @@ void programmingMode() {
     printf("Enter second integer: ");
     scanf("%d", &num2);
 
-    // Calculation
-    switch (operator) {
-        case '+':
-            result = num1 + num2;
-            break;
-        case '-':
-            result = num1 - num2;
-            break;
-        case '*':
-            result = num1 * num2;
-            break;
-        case '/':
-            if (num2 != 0) {
-                result = num1 / num2;
-            } else {
-                printf("Error: Division by zero\n");
-                result = 0;
-            }
-            break;
-        default:
-            printf("Invalid operator\n");
-            result = 0;
-    }
+    // Calculation + Display the result
 
-    // Display the result
+    result = performOperation(num1, operator, num2);
+   
     printf("Result: %d\n", result);
 }