/in/foo.cc: In function 'int main()':
/in/foo.cc:18:9: warning: unused variable 'i' [-Wunused-variable]
     int i,j,k,m,n,a,b,x,y;
         ^
/in/foo.cc:18:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,k,m,n,a,b,x,y;
           ^
/in/foo.cc:18:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k,m,n,a,b,x,y;
             ^
/in/foo.cc:18:15: warning: unused variable 'm' [-Wunused-variable]
     int i,j,k,m,n,a,b,x,y;
               ^
/in/foo.cc:18:17: warning: unused variable 'n' [-Wunused-variable]
     int i,j,k,m,n,a,b,x,y;
                 ^