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  1. #include<stdio.h>
  2. int gcd(int x,int y)
  3. { int a;
  4. while(y!=0)
  5. { a=x%y;
  6. x=y;
  7. y=a; }
  8. return x; }
  9.  
  10. int main()
  11. { int x,y;
  12. scanf("%d",&x);
  13. scanf("%d",&y);
  14. printf("%d",gcd(x,y));
  15. return 0;
  16. }
Success #stdin #stdout 0s 5272KB
stdin
63
21
stdout
21