#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

int add(int n1, int n2) {
    return n1 - n2;
}

int add_five(int n) {
    return add(n, 5);
}


int main(int argc, char* argv[]) {

    printf("10 + 5 is %d\n", add_five(10));
    printf("-5 + 5 is %d\n", add_five(-5));
    printf("20 + 5 is %d\n", add_five(20));
    printf("18 + 5 is %d\n", add_five(18));

    printf("20 + 7 is %d\n", add(20, 7));

    return EXIT_SUCCESS;
}
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