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Finding Greatest Common Divisor recursively E-mail
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In mathematics, the greatest common divisor (gcd), sometimes known as the greatest common factor (gcf) or highest common factor (hcf), of two non-zero integers, is the largest positive integer that divides both numbers.

The greatest common divisor of a and b is written as gcd(a, b), or sometimes simply as (a, b). For example, gcd(12, 18) = 6, gcd(−4, 14) = 2 and gcd(5, 0) = 5. Two numbers are called coprime or relatively prime if their greatest common divisor equals 1. For example, 9 and 28 are relatively prime.

The code below shows how to implement gcd function recursively.

/**
 * Return the greatest common divisor
 */
 
 public static long gcd(long a, long b) {
 
   if (b==0
     return a;
   else
     return gcd(b, a % b);
 

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