关于数组，指针及字符串的使用。。急，各位大侠帮帮忙

#include<iostream.h>
void main()
{
    char m,c[26]={'a','b','c','d','e','f','g','h','i','j','k','l','m',
        'n','o','p','q','r','s','t','u','v','w','x','y','z'};
    cout<<"请输入一个字符:"<<endl;
    cin>>m;
    for(int i=0;i<26;i++)
    {
        if(m==*(c+i))
        {
            cout<<"转换后为:"<<*(c+(i+3)%26)<<endl;
            break;
        }
    }
 
}//数组和指针都用到了