Determine the greatest common divisor (GCD) of two integers, m & n. The algorithm for GCD might be defined as follows:
While m is greater than zero:
If n is greater than m, swap m and n.
Subtract n from m.
n is the GCD
Code in C
int gcd(int m, int n)
/* The precondition are following: m>0 & n>0. Let g = gcd(m,n). */
{
while( m > 0 )
{
if( n > m )
{ int t = m; m = n; n = t; } /* swap m & n*/
/* m >= n > 0 */
m - = n;
}
return n;
}