ch19-6.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include <conio.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#define  N 81

void chg(char *s)
{
   while(*s)
   if(*s=='z'||*s=='Z') {*s-=25; s++;}
   else if(*s>='a'&&*s<='y') {*s+=1;s++;}
       else if(*s>='A'&&*s<='Y') {*s+=1;s++;}
            else s++;
}

main( )
{
   char a[N];
   printf("Enter a string : "); gets(a);
   printf("The original string is : "); puts(a);
   chg(a);
   printf("The string after modified : ");
   puts (a);
}