/in/foo.cc: In function 'int main()':
/in/foo.cc:9:23: error: 'i' was not declared in this scope
    9 |         for(int num=1;i<=m;i++)
      |                       ^
/in/foo.cc:9:17: warning: unused variable 'num' [-Wunused-variable]
    9 |         for(int num=1;i<=m;i++)
      |                 ^~~