foo.cc: In function 'int main()':
foo.cc:12:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int j=0; j<=i; j++)
   ^~~
foo.cc:13:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   cout<<setw(3)<<k<<" ";k++;
                         ^