/in/foo.cc: In function 'int main()':
/in/foo.cc:9:17: error: 'z' was not declared in this scope
    9 |                 z=n%10;
      |                 ^
/in/foo.cc:5:19: warning: unused variable 'x' [-Wunused-variable]
    5 |         int n,y=0,x;
      |                   ^