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#include "iostream"
#include "stdio.h"
#include "stdlib.h"

using namespace std;

//c++中函数不能直接返回一个二维数组
//当需要函数的返回值为一个二维数组，可采用typedef
typedef int(*R)[3];
R transpose(int arr[][3], int rows, int cols) //不能写成int ** transpose(int **a ,int...)
{
	for (int i = 0; i < rows; i++) {
		for (int j = i + 1; j < cols; j++)
		{
			int temp = arr[i][j];
			arr[i][j] = arr[j][i];
			arr[j][i] = temp;
		}
	}
	return arr;
}

int main()
{
	int ret = 0;
	int arr[3][3] = { { 1, 2, 3 },{ 4, 5, 6 },{ 7, 8, 9 } };

	transpose(arr, 3, 3);
	for (int i = 0; i < 3; i++) {
		for (int j = 0; j < 3; j++)
		{
			printf("%d ", arr[i][j]);
		}
		printf("\n");
	}
	
	return ret;
	
}