编辑代码

#include <stdio.h> 
#include <stdlib.h>
int main()
{
   char card_name[3];
   puts("输入牌名：");
   scanf("%2s",card_name);
   int val=0;
   switch(card_name[0]){
   case 'K':
   case 'J':
   case 'Q':
      val=10;
      break;
   case 'A':
      val=11;
      break;
   default:
      val=atoi(card_name);
   } 
   printf("这张牌的点数是：%i\n",val);
   return 0;
}

#include<stdio.h>
int main()
{
    char cards[]="JQK";
    char a_card=cards[2];
    cards[2]=cards[1];
    cards[1]=cards[0];
    cards[0]=cards[2];
    cards[2]=cards[1];
    cards[1]=a_card;
    puts(cards);
    return 0;
}