/in/foo.c: In function 'isgreater':
/in/foo.c:18:24: warning: comparison of constant '0' with boolean expression is always false [-Wbool-compare]
     if(tmp) return tmp < 0;
                        ^
/in/foo.c:21:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^