Library with tests

#include<stdio.h>
#include "mymath.h"

int main() {
    int x = add(2, 4);
    int y = multiply(2, 2);

    printf("Result of add: %d\n", x);
    printf("Result of multiply: %d\n", y);

    return 0;
}

calc: calc.c
	gcc -Wall -ansi -pedantic calc.c mymath.c -o calc


test: test.c
	gcc -Wall -ansi -pedantic test.c mymath.c -o test
	./test

int add(int x, int y) {
    return x + y;
}

int multiply(int x, int y) {
    return x + y;
}

int add(int x, int y);
int multiply(int x, int y);

#include<stdio.h>
#include<assert.h>
#include "mymath.h"

int main() {
    int result;
    result = add(1, 1);

    assert(2 == result);
    assert(4 == multiply(2, 2));
    assert(6 == multiply(2, 3));

    return 0;
}