由键盘输入一个3*4的矩阵，要求输出它的转置矩阵

#include <iostream>
using namespace std;
int main()
{
	int a[3][4];
	for (int i=0;i<3;i++)
	for (int j=0;j<4;j++)
	{
		cout<<"输入a["<<i<<"]["<<j<<"]:";
		cin>>a[i][j];
	}
		cout<<"矩阵为："<<endl;
	for (int i=0;i<3;i++)
	{
		for (int j=0;j<4;j++)
		{
		cout<<"a["<<i<<"]["<<j<<"]:"<<a[i][j]<<" ";
		}
		cout<<endl;
	}
		cout<<"转置矩阵为："<<endl;
	for (int j=0;j<4;j++)
	{
		for (int i=0;i<3;i++)
		{
		cout<<"a["<<i<<"]["<<j<<"]:"<<a[i][j]<<" ";
		}
		cout<<endl;
	}

	return 0;
}