make and makefile

//Add: 
#include "mymath.h"
int add(int a, int b) {
return a + b;
}
//Subtract:
#include "mymath.h"
int subtract(int a, int b) {
return a - b;
}
//Multiply:
#include "mymath.h"
int multiply(int a, int b) {
return a * b;
}
//Divide:
#include "mymath.h"
int divide(int a, int b) {
return a / b;
}