使用C语言实现交换数组元素

思路：使用头尾下标通过使用三方变量实现交换，注意头尾变量相等时单独进行交换。

1.头交换

int tmp1 = arr1[left];
arr1[left] = arr2[left];
arr2[left] = tmp1;

2.尾交换

int tmp2 = arr1[right];
arr1[right] = arr2[right];
arr2[right] = tmp2;

3.相等时

		if (left == right){tmp1 = arr1[left];arr1[left] = arr2[right];arr2[right] = tmp1;}

总代码

#include <stdio.h>int main()
{int arr1[] = { 0,1,2,3,4 };int arr2[] = { 5,6,7,8,9 };int i = 0, j = 0;int sz = sizeof(arr1) / sizeof(arr1[0]);int left = 0, right = sz - 1;printf("交换前\n");for (i = 0; i < sz; i++){printf("%d ", arr1[i]);}printf("\n");for (i = 0; i < sz; i++){printf("%d ", arr2[i]);}printf("\n");while (left <= right){int tmp1 = arr1[left];arr1[left] = arr2[left];arr2[left] = tmp1;int tmp2 = arr1[right];arr1[right] = arr2[right];arr2[right] = tmp2;if (left == right){tmp1 = arr1[left];arr1[left] = arr2[right];arr2[right] = tmp1;}left++;right--;}printf("交换后\n");for (i = 0; i < sz; i++){printf("%d ", arr1[i]);}printf("\n");for (i = 0; i < sz; i++){printf("%d ", arr2[i]);}printf("\n");return 0;
}