Question

Develop a program in c++ (name it AddMatrices) that adds two matrices that a user inputs. The matrices must of the same size. The program defines method Addition() that takes two two-dimensional arrays of integers and returns their addition as a two-dimensional array. The program main method defines two 3-by-3 arrays of type integer. The method prompts the user to initialize the arrays. Then it calls method Addition(). Finally, it prints out the array retuned by method Addition(). Document your code, and organize and space the outputs properly as shown below.

Sample run :

Matrix A:

2 1 2

7 1 8

3 20 3

Matrix B:

1 1 1

1 1 1

1 1 1

A + B:

3 2 3

8 2 9

4 21 4

Answer 1

#include<iostream>

using namespace std;

int** Addition(int a[3][3], int b[3][3]) {

int **c;

c = new int*[3];

for (int i=0; i<3; i++) {

c[i] = new int[3];

for (int j=0; j<3; j++) {

c[i][j] = a[i][j] + b[i][j];

}

}

return c;

}

int main ()

{

int i, j, A[3][3], B[3][3];

int **C;

cout << "Enter elements of matrix A : ";

for (i = 0; i < 3; i++)

for (j = 0; j < 3; j++)

cin >> A[i][j];

   cout << "Enter elements of matrix B : ";

for (i = 0; i < 3; i++)

for (j = 0; j < 3; j++)

cin >> B[i][j];   

C = Addition(A, B);

cout << "Sum of matrices\n";

for (i = 0; i < 3; i++)

{ for (j = 0; j < 3; j++)

cout << C[i][j] << " ";  

cout << "\n";

}

return 0;

}