about c language

Question

what is function in c pragramming  to take mod of number in c ie. |-15|=15

Answer 1

abs function

SYNOPSIS
        
#include <stdlib.h>
int abs(int j);
long int labs(long int j);
long long int llabs(long long int j);

Answer 2

You can always design your own, 

int mod(int num){
    if(num<0) return -num;
    else return num;
}