请问我这段代码有什么问题

#include

int main() {
switch ( type ) {
case 1:
case 2:
printf("hello\n");
break;
case 3:
printf("nice\n");
break;
case 4:
printf("hello4\n");
break;
default;
printf("你好\n");
break;
}
return 0;
}

default 后加的是；错了
type 没有定义

试试看

#include <stdio.h>

int main() {
switch ( 1 ) {
case 1:
case 2:
printf("hello\n");
break;
case 3:
printf("nice\n");
break;
case 4:
printf("hello4\n");
break;
default:
printf("你好\n");
break;
}
return 0;
}