# Answered Essay: [C++]I need to write a class that solves 3×3 systems of equations (3 equations with 3 u

[C++]I need to write a class that solves 3×3 systems of equations (3 equations with 3 unknowns). (This is about Matrices reduced to row echelon form or Gaus Jordan Elimination Process).

If you do don’t know how to do this, please, don’t answer this question! If anything is unclear just comment, and I will try to clear up the confusion.

Also, I will report blatantly wrong answers.

SOURCE CODE-

#include <iostream>
#include <cstdlib>
#include <iomanip>

using namespace std;
class Solver{
public:

void printmat(float mat[][4]);
void RowRed(float mat[][4]);
};

int main()
{
Solver ob;
float mat[3][4] = {{5, -6, -7, 7},
{3, -2, 5, -17},
{2, 4, -3, 29}}; //answer should be {2, 4, -3}

ob.printmat(mat);
ob.RowRed(mat);
}

void Solver:: printmat(float mat[][4]) // Outputs the matrix
{
int p=3;
int q=4;

for (int i=0; i<p; i++) {
for (int j=0; j<q; j++) {
cout << setw(7) << setprecision(4) << mat[i][j] << ” “;
}
cout << endl;
}

cout << endl;
}

void Solver:: RowRed(float mat[][4])
{
const int nrows = 3; // number of rows
const int ncols = 4; // number of columns

float d, m;

for (int r = 0; r < nrows; r++) { // for each row …
/* calculate divisor and multiplier */

for (int c = 0; c < ncols; c++) { // for each column …
mat[r][c] /= d; // make pivot = 1
else
mat[r][c] -= mat[lead][c] * m; // make other = 0
}
}

printmat(mat);
}
}

OUTPUT-

Pages (550 words)
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