C++ Program to Print Upperhalf and Lowerhalf Triangle of Square Matrix

Here is the C++ program to print upperhalf and lowerhalf triangle of a square matrix.

#include<iostream>

using namespace std;

int main()
{
	int a[10][10],i,j,m;
	cout<<"Enter size of the Matrix(min:3,max:5):";
	cin>>m;
	cout<<"\nEnter the Matrix row wise:\n";
	
	for(i=0;i<m;i++)
		for(j=0;j<m;++j)
			cin>>a[i][j];
	
	cout<<"\n\n";
	
	for(i=0;i<m;++i)
	{
		for(j=0;j<m;++j)
		{
			if(i<j)
				cout<<a[i][j]<<" ";
			else
				cout<<"  ";
		}
		
		cout<<"\n";
	}
	
	cout<<"\n\n";
	
	for(i=0;i<m;++i)
	{
		for(j=0;j<m;++j)
		{
			if(j<i)
				cout<<a[i][j]<<" ";
			else
				cout<<" ";
		}
		cout<<"\n";
	}

	return 0;
}

Output

Enter size of the Matrix(min:3,max:5):3

Enter the Matrix row wise:
1 2 3
4 5 6
7 8 9

2 3
  6

4
7 8