/in/foo.cc: In function 'int main()':
/in/foo.cc:11:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   11 |                 if(a%i==0&&b%i==0)
      |                   ^
/in/foo.cc:17:15: warning: 'k' may be used uninitialized [-Wmaybe-uninitialized]
   17 |         cout<<k;
      |               ^
/in/foo.cc:5:21: note: 'k' was declared here
    5 |         int a,b,n,i,k;
      |                     ^