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JavaScript

function func(m,n) {
	var M = m, N = n;
  var to = M > N ? N : M;
  for (var i=2; i<=to; i++) {
  	if (M % i == 0 && N % i == 0){
    	return func(M/i, N/i);
    }
  }
  return "M = " +M+ ", N = " +N;
}

alert(func(12,16))

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JavaScript

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Join the 4+ million users, and keep the JSFiddle dream alive.

Ad-free

Use pre-released features

Fiddle collections

Private collections and fiddles

Console