求一个菜单命令的代码

根据LZ的要求，我做了个菜单DIY：

#include<stdio.h>
int main()
{
    int i;
return1:
    printf("菜单:\n");
    printf("1-number01 \n2-number02 \n3-number03\n");
    printf("\n");
    printf("请选择有效序号：");
    scanf("%d",&i);
    switch(i)
    {
        case 1 :
            printf("选项1");
            break;
        
        case 2 :
            printf("选项2");
            break;
            
        case 3 :
            printf("选项3");
            break;
        default :
            printf("\a");
            system("CLS");
            printf("输入错误！\n");
            system("PAUSE");
            system("CLS");
            goto return1;
            break;
            
    }
    return 0;
}//已经测试成功！