Question

我正在尝试使用qsort（）对结构中的价格进行排序。排序后，结构中的一个元素（测试）变为0.你能告诉我为什么以及如何解决它？

谢谢！

#include <stdio.h>
#include <stdlib.h>

typedef struct {
    int price;
    int test;
    int id;
} order;
order list[10];
int i = 0;

int compare (const void * a, const void * b)
{

  order *orderA = (order *)a;
  order *orderB = (order *)b;

  return ( orderA->price - orderB->price );
}

int main ()
{
    srand ( time(NULL) );

    printf("Before sorting\n");
    for(i=0; i<10; i++){ 
        list[i].price = rand()%10;
        list[i].test = rand()%10;
        list[i].id = i; 
        printf ("Order id = %d Price = %d Test = %d\n",list[i].id, list[i].price, list[i].test);           
    }
    printf("AFTER sorting\n");
    int n;
    qsort (list, 6, sizeof(order), compare);
    for (n=0; n<10; n++)
         printf ("Order id = %d Price = %d Test = %d\n",list[n].id, list[n].price, list[i].test);          
    return 0;
}

输出为：

在分拣之前   订单ID = 0价格= 4测试= 2
  订单ID = 1价格= 9测试= 3
  订单ID = 2价格= 5测试= 0
  订单ID = 3价格= 2测试= 8
  订单ID = 4价格= 8测试= 5
  订单ID = 5价格= 7测试= 4
  订单ID = 6价格= 9测试= 3
  订单ID = 7价格= 1测试= 1
  订单ID = 8价格= 8测试= 4
  订单ID = 9价格= 3测试= 3
  分拣后   订单ID = 3价格= 2测试= 0
  订单ID = 0价格= 4测试= 0
  订单ID = 2价格= 5测试= 0
  订单ID = 5价格= 7测试= 0
  订单ID = 4价格= 8测试= 0
  订单ID = 1价格= 9测试= 0
  订单ID = 6价格= 9测试= 0
  订单ID = 7价格= 1测试= 0
  订单ID = 8价格= 8测试= 0
  订单ID = 9价格= 3测试= 0

Answer 1

排序后，更改

printf ("Order id = %d Price = %d Test = %d\n",list[n].id, list[n].price, list[i].test);

到

printf ("Order id = %d Price = %d Test = %d\n",list[n].id, list[n].price, list[n].test);

如何在C语言

1 个答案: