switch hack on C

hack version.c

void switch_func(int n) {
    char *s;
    switch(n) {
        case 0:
            s = "Sun";
            if(0)
        case 1:
            { s = "Mon"; }
            if(0)
        case 2:
            { s = "Tue"; }
            if(0)
        case 3:
            { s = "Wed"; }
            if(0)
        case 4:
            { s = "Thu"; }
            if(0)
        case 5:
            { s = "Fri"; }
            if(0)
        case 6:
            { s = "Sat"; }
            printf("Today is %s\n", s);
            break;
        default:
            printf("invalid number\n");
            break;
    }
}

normal version.c

void print_day(char *s) {
    printf("Today is %s\n", s);
}

void switch_func(int n) {
    char *s;
    switch(n) {
        case 0: s = "Sun"; print_day(s); break;
        case 1: s = "Mon"; print_day(s); break;
        case 2: s = "Tue"; print_day(s); break;
        case 3: s = "Wed"; print_day(s); break;
        case 4: s = "Thu"; print_day(s); break;
        case 5: s = "Fri"; print_day(s); break;
        case 6: s = "Sat"; print_day(s); break;
        default: printf("invalid number\n"); break;
    }
}