Example: Determinant of a 2x2 Matrix in C++

// Determinant of a 2x2 Matrix
#include <iostream>
using namespace std;

int main() {
    // Step 1: Declare variables for the four elements of the 2x2 matrix
    // Using 'double' for flexibility, allowing both integer and decimal inputs.
    double a, b, c, d;

    // Step 2: Prompt the user to enter each element of the matrix
    cout << "Enter the elements of the 2x2 matrix:" << endl;
    cout << "  a b" << endl;
    cout << "  c d" << endl;

    cout << "Enter element a: ";
    cin >> a;
    cout << "Enter element b: ";
    cin >> b;
    cout << "Enter element c: ";
    cin >> c;
    cout << "Enter element d: ";
    cin >> d;

    // Step 3: Calculate the determinant using the formula (ad - bc)
    double determinant = (a * d) - (b * c);

    // Step 4: Display the entered matrix and its calculated determinant
    cout << "\nThe entered 2x2 matrix is:" << endl;
    cout << "| " << a << " " << b << " |" << endl;
    cout << "| " << c << " " << d << " |" << endl;
    cout << "The determinant of the matrix is: " << determinant << endl;

    return 0; // Indicate successful execution
}