Question

How to calculate the determinant of a 2X2 matrix in C++

Answer 1

// determinant is a scalar-valued of the entries of a square matrix

#include <iostream>

#define SIZE 2
 
int main()
{
    float arr[SIZE][SIZE] = { { 3, 8 },{ 4, 6 } };
 
    /*
    *       a b
    * arr =
    *       c d
    *
    * determinant = a*d - b*c
    *
    */
 
    float determinant = (arr[0][0] * arr[1][1]) - (arr[0][1] * arr[1][0]);
 
    std::cout << determinant << "\n";
}

 
 
/*
run:
 
-14
 
*/

 

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