a转换为b, b转换为c, z转换为a，大写字母规律相同，其它字符不变

Question

13. 函数fun的功能是: 将s所指字符串中的字母转换为按字母序列的后续字母，其它字符不变。 给定源程序： #include <stdio.h> void fun (char *s) { } void main( ) { char s[80]; printf("\n Enter a string with length < 80. :\n\n "); gets(s); printf("\n The string : \n\n "); puts(s); fun ( s ); printf ("\n\n The Cords :\n\n "); puts(s); }

Answer 1

#include <stdio.h> 
#include<string.h>
void fun (char *s) 
{ 
int i,l;
l=strlen(s);
for(i=0;i<l;i++)
if(s[i]>='a'&&s[i]<'z'||s[i]>='A'&&s[i]<'Z')
s[i]=s[i]+1;
else if(s[i]=='z')
s[i]='a';
else if(s[i]=='Z')
s[i]='A';

} 
void main( ) 
{ char s[80]; 
printf("\n Enter a string with length < 80. :\n\n "); gets(s); 
printf("\n The string : \n\n ");  
puts(s); 
fun ( s ); 
printf ("\n\n The Cords :\n\n ");  
puts(s); 
}

Answer 2

void fun (char *s) 
{ int i;
for(i=0;s[i]!='\0';i++)
if(s[i]=='z'||s[i]=='z')s[i]='a';else if(s[i]>='a'&&s[i]<='z')s[i]=s[i]+1;else if(s[i]>='A'&&s[i]<='Z')s[i]=s[i]+1;

}