main structure

src/main/c/Calculator/calculator.c

@@ -4,4 +4,11 @@
 void displayMenu();
 int add(int num1, int num2);
 int subtract(int num1, int num2);
-int multiply(int num1, int num2);
+int multiply(int num1, int num2);
+int divide(int num1, int num2);
+
+int main() {
+    int choice, num1, num2, result;
+
+    do {
+        displayMenu();