求助答案， 十万火急，请大哥大姐帮帮忙。。谢谢啦

// Note:Your choice is C++ IDE
#include <iostream>
using namespace std;

void Fun(int N, int M)
{
    int k = 0;
    for(int i = 1; i <= N; i++)
    {
        k = (k + M)%i;     //每次提走一个元素
    }
    cout<<k+1<<endl;
}

void Change(char a[], int b[], int n)  //n为字符串长度
{
    for(int i = 0; i != n-1; i++)
    {
        b[i] = (int)a[i];   //强制类型装换
        cout<<a[i]<<" to "<<b[i]<<endl;
    }
}

void Secret(char a[], char b[], int n, int N)  //n为字符串长度，N为移动个数
{
    for(int i = 0; i != n-1; i++)
    {
        if((a[i]>'a' && a[i]<='z'-N) || (a[i]>'A' && a[i]<='Z'-N))   //控制为字母
        {
            b[i] = a[i] + N;      
        }
        if((a[i]<='z' && a[i]>'z'-N) || (a[i]<='Z' && a[i]>'Z'-N))
        {
            b[i] = a[i] + N - 32;     //最后的N个字符往前N个字符换
        }
    }
}

void Menu()
{
    int n;
    cin>>n;
    while(1)
    {
        switch(n)
        {
            case 1:  功能函数........break;
            case 2:
            .............
        }
    }
}