C语言问题，程序代码运行报错，但不理解报错提示

Question

#include "final.h"
int main()
{
    int n,w=1;
    do
    {
        system("cls");
        printf("\n\n\t\t*********************MENU***********************\n\n");
        printf("\t\t\t\t1.以管理员身份登录(password 1)\n");
        printf("\t\t\t\t2.以学生身份登录\n");
        printf("\t\t\t\t3.关于\n");
        printf("\t\t\t\t4.帮助\n");
        printf("\t\t\t\t5.退出");
        prinyf("\n\n\t\t************************************************\n");
        printf("Choose your number(1-5):");
        scanf("%d",&n);
        switch(n)
        {
            case 1:
                    Mangers();
                    break;  
            case 2:
                    Students();
                    break;
            case 3:
                    About();
                    break;
            case 4:
                    Help();
                    break;
            case 5:
                    w=0;
                    break;
            default:   //语句n+1
        }
    }
    while(w==1);
    return 0;
}

Answer 1

default你得写点东西啊，或者直接break;