How to find LCM of two Numbers in C ?

#include <stdio.h> 
// Recursive function to return gcd of a and b
int gcd(int a, int b)
{
// Everything divides 0
    if (a == 0 || b == 0)
        return 0;
// Base case
    if (a == b)
        return a;
// a is greater
    if (a > b)
        return gcd(a-b, b);
    return gcd(a, b-a);
}
// Function to return LCM of two numbers
int lcm(int a, int b)
{
    return (a*b)/gcd(a, b);
}
// Driver program to test above function
int main()
{
    int a = 10, b = 28;
    printf("LCM of %d and %d is %d ", a, b, lcm(a, b));
    return 0;
}