**program:-**

#include<stdio.h>

int gcd(int a,int b)

{

if(a==b)

return (a);

if(a%b==0)

return (b);

if(b%a==0)

return (a);

if(a>b)

return (gcd(a%b,b));

else

return (gcd(a,b%a));

}

void main()

{

int a,b,g;

printf("Enter two number");

scanf("%d%d",&a,&b);

g=gcd(a,b);

printf("gcd is %d",g);

}

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