Calculate Determinant of a 4×4 Matrix in C++ – Programming Code Examples
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Calculate Determinant of a 4×4 Matrix in C++1 min read

12 months ago
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C++ program to find determinant of a 4×4 matrix.

C++ Code:

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
#define d 4  //4x4
 
double det (double A[d][d], int N)
{
    double c, r=1;
    for(int i = 0; i < N; i++) {
        for(int k = i+1; k < N; k++) {
            c = A[k][i] / A[i][i];
            for(int j = i; j < N; j++)
                A[k][j]= A[k][j] - c*A[i][j];
        }
    }
    for (int i = 0; i < N; i++)
        r *=A[i][i];
    return r;
}
 
int main()
{
      double M[d][d];
 
      for(int i=0; i<d; i++)
      {
for(int j=0; j<d; j++)
{
M[i][j] = rand() % 20;
}
      }
      printf("Det(M) = %f\n",det(M,d));
      return 0;
}
 




Output:

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