Question

C语言的前驱后继问题

输入一个字母字符，输出该字母字符的前驱和后继字符并输出（如，c的前驱和后继分别是b和d，a的前驱和后继分别是z和b，z的前驱和后继分别是y和a）。

#include <stdio.h>
void main()
{
char c1,c2,c3;
printf("input a letter\n");
scanf("%c",&c1);
c2=c1-1;
c3=c1+1;
if
(c1='a')
c2='z';
else
c2=c1-1;
c3=c1+1;
if
(c1='z')
c3='a';
else
c3=c1+1;
c2=c1-1;
printf("%c,%c\n",c2,c3);

}

谁能告诉我怎么做呀

Answer 1

#include <stdio.h>

void main()
{
char c1, c2, c3;
printf("input a letter\n");
scanf("%c",&c1);
c2 = c1 - 1;
c3 = c1 + 1;
if (c1 == 'a')
c2 = 'z';
if (c1 == 'z')
c3 = 'a';
printf("%c,%c\n",c2,c3);
}

不谢

Answer 2

#include <stdio.h>
#include "map_func.h"
void main()
{
char c1,c2,c3;
printf("input a letter\n");
scanf("%c",&c1);
if(c1=='a') //楼主注意：是 == 而不是 = 号
c2='z';
else
c2=c1-1;
if(c1=='z')
c3='a';
else
c3=c1+1;
printf("%c,%c\n",c2,c3);
}