Fixed a bug where the character set didn't show numbers

hangman.c

@@ -168,7 +168,7 @@ void initAlphabet(game_state *gs) {
     int hasNumber = 0;
     int i;
     for (i = 0; i < MAXWORDLENGTH; i++) {
-        if (isdigit(gs->guessWord[i]) == 1) {
+        if (isdigit(gs->guessWord[i]) > 0) {
             hasNumber = 1;
             break;
         }