题目：
出现问题：


程序：#include<stdio.h>
#include<math.h>
#include<conio.h>

void main()
{
    int i;
    char c;
    printf("输入原文请按1，输入密码请按2！\n");
    scanf("%d",i);
    switch(i)
    {
    case 1:
        {
            printf("请输入原文：\n");
            c=getch();
            if(('a'<=c&&c<'w')||('A'<=c&&c<'W'))
            {
                printf("%c",c+4);
            }
            else if(('w'<=c&&c<='z')||('W'<=c&&c<='Z'))
            {
                printf("%c",c-22);
            }
            else
            {
                printf("%c",c);
            }
        };break;
    case 2:
        {
            printf("请输入密码：\n");
            c=getch();
            if(('e'<=c&&c<='z')||('E'<=c&&c<='Z'))
            {
                printf("%c",c-4);
            }
            else if(('a'<=c&&c<='d')||('A'<=c&&c<='D'))
            {
                printf("%c",c+22);
            }
            else
            {
                printf("%c",c);
            }
        };break;
    default :break;
    }
}



初学，请多多指教

其实这个程序还是有点用不了，麻烦您再看看行吗？

还没有学数组，不太了解，谢谢你啦