/in/foo.cc: In function 'int main()':
/in/foo.cc:20:23: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    printf("%0.2lf\n",c);
                       ^
/in/foo.cc:24:23: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    printf("%0.2lf\n",b);
                       ^