/in/foo.cc: In function 'int main()':
/in/foo.cc:11:3: error: expected ',' or ';' before 'for'
   for(int j=0;j<i;j++)
   ^~~
/in/foo.cc:11:15: error: 'j' was not declared in this scope
   for(int j=0;j<i;j++)
               ^
/in/foo.cc:18:8: warning: statement has no effect [-Wunused-value]
    step;
        ^