sa4103.c

来自「学习C语言必备的好书」· C语言 代码 · 共 25 行

#include "stdio.h"
#include "string.h"     /*包含字符串库函数说明的头文件 */

void forward_and_backwards(char line_of_char[],int index);

void main()
{
   char line_of_char[80];
   int index = 0;

   strcpy(line_of_char,"This is a string.");
   forward_and_backwards(line_of_char,index);
}

void forward_and_backwards(char line_of_char[],int index)
{
   if (line_of_char[index]) 
   {
      printf("%c",line_of_char[index]);
      
      forward_and_backwards(line_of_char,index+1);

      printf("%c",line_of_char[index]);
   }
}