Euclid’s Algorithm C code

Euclid’s algorithm calculates the GCD (Greatest Common Divisor) for two numbers a and b. The following C program uses recursion to get the GCD.

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The code is also available on GitHub.

#include <stdio.h>
 
int euclid(int a, int b) {
 if (b == 0) {
  return a;
 } else {
  return euclid(b, a % b);
 }
}
 
int main(int argc, char* argv[]) {
 int a = 30, b = 21;
 printf("GCD is %d\n", euclid(a, b));
 return 0;
}
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