Question

*****In C++***** Exercise #3: Develop a program (name it AddMatrices) that adds two matrices. 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 1: 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 Sample run 2: Matrix A: 2 2 2 2 2 2 2 2 2 Matrix B: 2 2 2 2 2 2 2 2 2 A + B: 4 4 4 4 4 4 4 4 4

Answer 1

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Here to return a two dimensional array i have used double pointer

SOLUTION:

#include <bits/stdc++.h>
using namespace std;
#define N 3
int** addition(int A[][N], int B[][N]);
// This function adds A[][] and B[][], and stores its resukt into a double pointer
//and return that
int** addition(int A[][N], int B[][N])
{
int i, j;
//create a double pointer
   int** C=0;
   C=new int*[3];
   //create its array in one dimesional i.e rows
for (i = 0; i < N; i++) {
   //create array into two dimensional based on the columns
   C[i]=new int[3];
for (j = 0; j < N; j++)
//add and store data into the C
C[i][j] = A[i][j] + B[i][j];
       }
return C;//return the pointer
}
  
// main function
int main()
{
int i, j,A[3][3],B[3][3];
//create two arrays
cout<<"Matrix A: ";
//read data to A matrix
for (i = 0; i < N; i++)
for (j = 0; j < N; j++)
{
   cin>>A[i][j];
       }
   cout<<"Matrix B :";
   //read data to B matrix
   for (i = 0; i < N; i++)
for (j = 0; j < N; j++)
{
   cin>>B[i][j];
       }
   //call the addition function and store it into a pointer
   int** C=addition(A,B);
   cout<<"A+B: ";
   //print data
   for (i = 0; i < N; i++) {
for (j = 0; j < N; j++)
{
   cout<<C[i][j]<<" ";
       }
}
}

CODE IMAGE:

OUTPUT: