C program to find HCF and LCM using function

C program to find HCF and LCM using function

#include 
long fun(long, long); // function declaration
int main()
{
long a, b, hc, lc;
printf("Enter two numbers: ");
scanf("%ld%ld", &a, &b);

hc = fun(a, b);// Function Calling
lc = (a*b)/hc;

printf(" The highest Common Factor of %ld and %ld = %ld\n", a, b, hc);
printf(" The Least Common Multiple of %ld and %ld = %ld\n", a, b, lc);

return 0;
}

long fun(long a, long b) // Function definition
{
if (a == 0)
{
return b;
}

while (b != 0) {
if (a > b) {
a = a - b;
}
else {
b = b - a;
}
}

return a;
}