Question

(CODEBLOCKS)
Write a program that takes as input two 3x3 2-D arrays and write the following two functions:
a. getInpt(.): this functions takes input from the user and fills the matrix (or a 2D
array).
b. print(.): this function takes a 2-D arrays as the formal parameter and prints the
results on the screen.
c. addMat( , , ): this function takes two 2-D arrays (or matrices) and finds the sum
of the two matrices and stores the results in the third formal parameter.
d. multMat( , , ): this function takes two 2-D arrays( or matrices) and finds the
product of the two matrices and stores the results in the third formal parameter.
You can use the following main method.
int main( ) {
int mat1[rows][cols], mat2[rows][cols], res[rows][cols];
cout<<"Please enter a 3x3 matrix: "; getInput(mat1);
cout<<"Please enter a 3x3 matrix: "; getInput(mat2);
addMat( mat1, mat2, res);
cout<<"\nSum of matrices: ";
print(res);
multMat( mat1, mat2, res);
cout<<"\nProduct of matrices: ";
print(res);
return 0;

Answer 1

Answer on Question#49934 - <programming> - <c++>

Program

#include <iostream>
#define N 3
#define M 3
using namespace std;
void getInput(int **mass)
{
    int i, j;
    for(i=0; i<N; i++)
        for(j=0; j<M; j++)
            cin >> mass[i][j];
}
void print(int **mass)
{
    int i, j;
    for(i=0; i<N; i++)
    {
        for(j=0; j<M; j++)
            cout << mass[i][j] << " ";
        cout << endl;
    }
}
void addMat(int **mas1, int **mas2, int **res)
{
    int i, j;
    for(i=0; i<N; i++)
        for(j=0; j<M; j++)
            res[i][j] = mas1[i][j] + mas2[i][j];
}
void multMat(int **mas1, int **mas2, int **res)
{
    int i, j, k;
    for(i=0; i<N; i++)
        for(j=0; j<M; j++)
        {
            res[i][j] = 0;
            for(k=0; k<N; k++)
                res[i][j] += mas1[i][k] * mas2[k][j];
        }
}
int main()
{
    int **mat1 = new int*[N], **mat2 = new int*[N], **res = new int*[N];
    int i;
    for(i=0; i<N; i++)
    {
        mat1[i] = new int[M];
        mat2[i] = new int[M];
        res[i] = new int[M];
    }
    cout << "Please enter a 3x3 matrix: ";
    getInput(mat1);
    cout << "Please enter a 3x3 matrix: ";
    getInput(mat2);
    addMat(mat1, mat2, res);
    cout << "\nSum of matrices: " << endl;
    print(res);
    multMat(mat1, mat2, res);
    cout << "\nProduct of matrices: " << endl;
    print(res);
    return 0;
}

Example of execute program:

Please enter a 3x3 matrix: Input element [0][0]: 1

Input element [0][1]: 2

Input element [0][2]: 3

Input element [1][0]: 4

Input element [1][1]: 5

Input element [1][2]: 6

Input element [2][0]: 7

Input element [2][1]: 8

Input element [2][2]: 9

Please enter a 3x3 matrix: Input element [0][0]: 1

Input element [0][1]: 0

Input element [0][2]: 0

Input element [1][0]: 0

Input element [1][1]: 1

Input element [1][2]: 0

Input element [2][0]: 0

Input element [2][1]: 0

Input element [2][2]: 1

Sum of matrices:

2 2 3

4 6 6

7 8 10

Product of matrices:

1 2 3

4 5 6

7 8 9

Process returned 0 (0x0) execution time : 191.484 s

Press any key to continue.