C compare string literal with function returning char pointer -

why code:

strcmp(myfunction(0), "ok");

where myfunction defined this:

char *myfunction(int p) {     if (p == 0)     {         return("ok");     } }

give following error:

warning: passing argument 1 of 'strcmp' makes pointer integer without cast

do have prototype above call? function should either prototyped or defined before used. otherwise compiler assume has default return type of int.

// prototype char *myfunction(int p);  int main() {     // use     strcmp(myfunction(0), "ok"); }  // definition char *myfunction(int p) {     ... }

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