Incorporate functions module into main module.

project0.cpp

@@ -16,6 +16,7 @@ using std::cin;
 #include <getopt.h>
 
 #include "class.h"
+#include "functions.h"
 
 int main() {
     int num_values;
@@ -28,6 +29,8 @@ int main() {
         Class c(x, y);
         c.display();
     }
+    
+    calculate(1800, 17);
 
     return 0;
 }