#include <stdio.h>
#include <string.h>
int main(void)
{
 int num = 15 ;
 //26個(gè)字母 
 const char str[] = "abcdefghijklmnopqlstuvwxyz" ;
 //這個(gè)做法是將num這個(gè)十進(jìn)制數(shù)通過(guò)取模轉(zhuǎn)換為字母并輸出，從程序看，即可知道是輸出p 
 char a = str[num%26] ;
 printf("a=%c\n",a);
 return 0 ; 
} 

#include <stdio.h>
#include <string.h>
int main(void)
{
 int num = 15 ;
 char *str = "abcdefghijklmnopqlstuvwxyz" ;
 char a = str[num%26] ;
 printf("a=%c\n",a);
 return 0 ; 
} 

#include <stdio.h>
#include <string.h>
int main(void)
{
 int num = 15 ;
 //char *str = "abcdefghijklmnopqlstuvwxyz" ;
 char a = "abcdefghijklmnopqlstuvwxyz"[num%26] ;
 printf("a=%c\n",a);
 return 0 ; 
} 

#include <stdio.h>
int main(void)
{
 char *p = "0123456789abcdef" ;
 putchar(p[3]);
 //換行 
 putchar('\n');
 putchar(*(p + 3));
 putchar('\n');
 putchar("0123456789abcdef"[3]);
 putchar('\n');
 putchar(*("0123456780abcdef"+3));
 putchar('\n');
 return 0 ; 
}