C++ Exercises: Produce a square matrix with 0's down the main diagonal

C++ For Loop: Exercise-69 with Solution

Write a program in C++ to produce a square matrix with 0's down the main diagonal, 1's in the entries just above and below the main diagonal, 2's above and below that, etc.
0 1 2 3 4
1 0 1 2 3
2 1 0 1 2
3 2 1 0 1
4 3 2 1 0

Pictorial Presentation:

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;
int main()
{
    int n, i, j, k, m = 0;
    cout << "\n\n Print patern........:\n";
    cout << "-----------------------------------\n";
    cout << " Input number or rows: ";
    cin >> n;
    for (i = 1; i <= n; i++) {
        if (i == 1) {
            for (j = 1; j <= i; j++) {
                cout << m << "  ";
            }
            for (k = 1; k <= n - i; k++) {
                cout << k << "  ";
            }
        }
        else {
            for (k = i - 1; k >= 1; k--) {
                cout << k << "  ";
            }
            cout << m << "  ";
            for (j = 1; j <= n - i; j++) {
                cout << j << "  ";
            }
        }
        cout << endl;
    }
    cout << endl;
}

Sample Output:

 Print patern........:                                                 
-----------------------------------                                    
 Input number or rows: 8                                               
0  1  2  3  4  5  6  7                                                 
1  0  1  2  3  4  5  6                                                 
2  1  0  1  2  3  4  5                                                 
3  2  1  0  1  2  3  4                                                 
4  3  2  1  0  1  2  3                                                 
5  4  3  2  1  0  1  2                                                 
6  5  4  3  2  1  0  1                                                 
7  6  5  4  3  2  1  0

Flowchart:

C++ Code Editor:

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