冒泡排序

总结：不可以在for循环初始化中定义变量；

#include<stdio.h>  
int main()
{
  int a[3];
  int temp = 0, i, x, y;
  for (i = 0; i < 3; i++)  scanf("%d", &a[i]);
  /*冒泡排序*/
  for (x = 0; x < 3; x++)
  {
    for (y = x + 1; y < 3; y++)
    {
      if (a[x] < a[y])
      {
        temp = a[x];
        a[x] = a[y];
        a[y] = temp;
      }
    }
  }
  for (i = 0; i < 3; i++)  printf("%d ", a[i]);
  system("pause");
}