Add Two Matrix Using Multi-dimensional Arrays using C++

On this program user to enter the size of the matrix (rows and column) then, it asks the user to enter the elements of two matrices and finally it adds two matrix and displays the result.

Source Code to Add Two Matrix in C++ programming

#include <iostream>
using namespace std;
int main(){
    int r,c,a[100][100],b[100][100],sum[100][100],i,j;
    cout << "Enter number of rows (between 1 and 100): ";
    cin >> r;
    cout << "Enter number of columns (between 1 and 100): ";
    cin >> c;
    cout << endl << "Enter elements of 1st matrix: " << endl;

/* Storing elements of first matrix entered by user. */

    for(i=0;i<r;++i)
       for(j=0;j<c;++j)
       {
           cout << "Enter element a" << i+1 << j+1 << " : ";
           cin >> a[i][j];
       }

/* Storing elements of second matrix entered by user. */

    cout << endl << "Enter elements of 2nd matrix: " << endl;
    for(i=0;i<r;++i)
       for(j=0;j<c;++j)
       {
           cout << "Enter element b" << i+1 << j+1 << " : ";
           cin >> b[i][j];
       }

/*Adding Two matrices */

   for(i=0;i<r;++i)
       for(j=0;j<c;++j)
           sum[i][j]=a[i][j]+b[i][j];

/* Displaying the resultant sum matrix. */

    cout << endl << "Sum of two matrix is: " << endl;
    for(i=0;i<r;++i)
       for(j=0;j<c;++j)
       {
           cout << sum[i][j] << "  ";
           if(j==c-1)
               cout << endl;
       }

    return 0;
}

Output

Enter number of rows (between 1 and 100): 2
Enter number of columns (between 1 and 100): 2

Enter elements of 1st matrix:
Enter element a11: -4
Enter element a12: 5
Enter element a21: 6
Enter element a22: 8

Enter elements of 2nd matrix:
Enter element b11: 3
Enter element b12: -9
Enter element b21: 7
Enter element b22: 2

Sum of two matrix is:
-1   -4
13   6