【C言語】
switch文の中でreturn直後にbreakは必要か？

typedef enum { R, G, B } Color;
char    *f1(Color c) {
    switch (c) {
    case R:     return "赤";
    case G:     return "緑";
    case B:     return "青";
    default:    return "未知の色";
    }
}

char    *f2(Color c) {
    switch (c) {
    case R: return "赤";    break;
    case G: return "緑";    break;
    case B: return "青";    break;
    default:    
        return "未知の色";  break;
    }
}

char    *f3(Color c) {
    char    *ret ;
    switch (c) {
    case R: 
        ret = "赤";         
        break;
    case G: 
        ret = "緑";         
        break;
    case B: 
        ret = "青";         
        break;
    default:
        ret = "未知の色";   
        break;
    }
    return  ret ;
}