/in/foo.cc: In function 'int main()':
/in/foo.cc:30:14: error: 'i$b' was not declared in this scope
   if(i%a==0&&i$b==0)
              ^~~
/in/foo.cc:30:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(i%a==0&&i$b==0)
   ^~
/in/foo.cc:32:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    break;
    ^~~~~