二维数组的主次对角线输出与逆置

#include "stdafx.h"


int _tmain(int argc, _TCHAR* argv[])
{
	int a[4][4] = { 5, 1, 1, 1, 2, 50, 2, 2, 3, 3, 500, 3, 4, 4, 4, 5000 };
	/*for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
			scanf("%d", &a[i][j]);    //scanf输入多个数据时 数据之间需要用空格或者回车隔开
		}
	}*/

	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
			printf("%d	", a[i][j]);
		}
		putchar(10);
	}

	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
			if (i == j)
			{
				printf("%d", a[i][j]);
			}
		}
		putchar(10);
	}

	for (int i = 0; i < 4; i++)
	{
		printf("%d
", a[i][i]);
	}
	printf("-----------------------------
");

	//主对角线简便输入
	for (int i = 0; i < 4; i++)
	{
		int t = i;
		while (t--) //此处逻辑用来判断打印空格的个数
			putchar("	"); // printf("	");
		printf("%d
", a[i][i]);
	}

	printf("-----------------------------
");
	//次对角线简便输入  i+j=3
	for (int i = 0; i < 4; i++)
	{
		int t = 3 - i;
		while (t--)
			putchar("	");
		printf("%d
",a[i][3-i]);
	}

	return 0;
}

#include "stdafx.h"


int _tmain(int argc, _TCHAR* argv[])
{
	char a[4][4] = {
		"c", "a", "a", "a",
		"b", "c", "a", "a",
		"b", "b", "c", "a",
		"b", "b", "b", "c"
	};

	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
				printf("%d%d	",i,j);
		}
		putchar(10);
	}

	//逆置
	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
			if (i > j)   //逆置原理是 数组对角线下方的数的行号都大于列号，上方的数的行号都小于列号
			{            //并且对角线俩边数据的行号和列号正好颠倒，交换即可
				a[i][j] = a[i][j] ^ a[j][i];
				a[j][i] = a[i][j] ^ a[j][i];   
				a[i][j] = a[i][j] ^ a[j][i];
			}
		}
		putchar(10);
	}

	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
			printf("%c	", a[i][j]);
		}
		putchar(10);
	}

	return 0;
}