building an identity matrix

t13e03.identityMat.cpp

// t13e03.identityMat.cpp
// juanfc 2023-11-23
// 

#include <iostream>
#include <array>
using namespace std;

const int N = 3;
typedef array<array<int, N>,N> TSqMat;

void print(TSqMat m);
TSqMat identMat();

int main()
{
    print(identMat());

    return 0;
}

TSqMat identMat()
{
    TSqMat m;
    for (int row = 0; row < N; ++row)
        for (int col = 0; col < N; ++col)
            m[row][col] = (row==col)? 1: 0;
    return m;
}

void print(TSqMat m)
{
    for (int row = 0; row < N; ++row) {
        for (int col = 0; col < N; ++col) {
            cout << m[row][col] << " ";
        }
        cout << endl;
    }
}