int main(int argc,char *argv[])
{
int a=12;
int b=6;
int half;
int min=0;
if(b<a)
min=b;
else
min=a;
half=min/2;
for(int i = 2;i<=half;i++)
if((a % i ) == 0 &&(b % i)==0)printf("%d",i);
return 0;
}

23