C语言，数组逆置

原理：把第一个和最后一个互换，第二个和倒数第二个互换...........

while类型：

#include<stdio.h>
int main() {
	int temp = 0;
	int arr[10] = { 1,2,3,4,5,6,7,8,9,10 };
	int i = 0;
	int j = sizeof(arr) / sizeof(arr[0]) - 1;
    //int字节为4，所以sizeof(arr)=44,sizeof(arr[0])=4
	while (i < j) {
		temp = arr[i];
		arr[i] = arr[j];
		arr[j] = temp;
		i++;
		j--;
	}
	for (int i = 0; i <10; i++)
	{
		printf("%2d", arr[i]);
	}
	return 0;
}

for类型：

int main() {
	int temp = 0;
	int arr[11] = { 1,2,3,4,5,6,7,8,9,10 ,11};
	int i = 0;
	int j = sizeof(arr) / sizeof(arr[0]) - 1;//可改为11-1
	for (int i = 0; i < j; i++) {
		temp = arr[i];
		arr[i] = arr[j];
		arr[j] = temp;
		j--;

	}
	for (int i = 0; i < 11; i++)
	{
		printf("%3d", arr[i]);
	}
	return 0;
}

结果：