MultiplyTwoMatrices

#include<iostream>
using namespace std;
int main()
{
    int a[10][10], b[10][10], c[10][10], r1, c1, r2, c2, i, j, k;

    cout << "Enter rows and columns for first matrix: ";
    cin >> r1 >> c1;
    cout << "Enter rows and columns for second matrix: ";
    cin >> r2 >> c2;

 
    while (c1!=r2)
    {
        cout << "Error! column of first matrix not equal to row of second.";

        cout << "Enter rows and columns for first matrix: ";
        cin >> r1 >> c1;

        cout << "Enter rows and columns for second matrix: ";
        cin >> r2 >> c2;
    }

  
    cout << endl << "Enter elements of matrix 1:" << endl;
    for(i = 0; i < r1; ++i)
        for(j = 0; j < c1; ++j)
        {
            cout << "Enter element a" << i + 1 << j + 1 << " : ";
            cin >> a[i][j];
        }

    cout << endl << "Enter elements of matrix 2:" << endl;
    for(i = 0; i < r2; ++i)
        for(j = 0; j < c2; ++j)
        {
            cout << "Enter element b" << i + 1 << j + 1 << " : ";
            cin >> b[i][j];
        }
        cout<<"\n\n Multiplication of Two Matrices : \n";
        for(i=0; i<r1; i++)
        {
                for(j=0; j<c2; j++)
                {
                        sum=0;
                        for(k=0; k<c1; k++)
                        {
                                sum = sum + a[i][k] * b[k][j];
                        }
                        c[i][j] = sum;
                }
        }
        for(i=0; i<r1; i++)
        {
                for(j=0; j<c2; j++)
                {
                        cout<<" ";
                        cout<<c[i][j]<<"\t";
                }
                cout<<"\n";
        }
        return 0;
}