怎样把圈2的规则添加进去？

你题目的解答代码如下：

#include <stdio.h>

char fp(char c)
{
    if (c >= 'A' && c <= 'Z')
        c = (c - 'A' + 4) % 26 + 'A';
    if (c >= 'a' && c <= 'z')
        c = (c - 'a' + 4) % 26 + 'a';
    return c;
}

int main()
{
    char c1 = 'T';
    char c2 = 'o';
    char c3 = 'd';
    char c4 = 'a';
    char c5 = 'y';
    c1 = fp(c1);
    c2 = fp(c2);
    c3 = fp(c3);
    c4 = fp(c4);
    c5 = fp(c5);
    putchar(c1);
    putchar(c2);
    putchar(c3);
    putchar(c4);
    putchar(c5);
    putchar('\n');
    printf("%c%c%c%c%c\n",c1,c2,c3,c4,c5 );
    return 0;
}

如有帮助，望采纳！谢谢!

代码如下：

#include <stdio.h>
//定义这个函数来统一转换
char fun(char c1)
{
    if( (c1>='a' && c1 < 'w')  || (c1>='A' && c1 < 'W') )
        c1 = c1+4;
    else if( c1>='w' && c1 <= 'z')
        c1 = 'a' + c1+4-'z'-1;
    else if( c1>='W' && c1 <= 'Z' )
        c1 = 'A' + c1+4-'Z'-1;
    return c1;
}


int main()
{
    char c1='T',c2='o',c3='d',c4='a',c5='y';
    c1 = fun(c1);
    c2 = fun(c2);
    c3 = fun(c3);
    c4 = fun(c4);
    c5 = fun(c5);

    printf("%c%c%c%c%c",c1,c2,c3,c4,c5);
    return 0;
}