3x3 matrix multiplication in c 2b 2b

1#include <iostream>
2using namespace std;
3
4int main()
5{
6    int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;
7
8    cout << "Enter rows and columns for first matrix: ";
9    cin >> r1 >> c1;
10    cout << "Enter rows and columns for second matrix: ";
11    cin >> r2 >> c2;
12
13    // If column of first matrix in not equal to row of second matrix,
14    // ask the user to enter the size of matrix again.
15    while (c1!=r2)
16    {
17        cout << "Error! column of first matrix not equal to row of second.";
18
19        cout << "Enter rows and columns for first matrix: ";
20        cin >> r1 >> c1;
21
22        cout << "Enter rows and columns for second matrix: ";
23        cin >> r2 >> c2;
24    }
25
26    // Storing elements of first matrix.
27    cout << endl << "Enter elements of matrix 1:" << endl;
28    for(i = 0; i < r1; ++i)
29        for(j = 0; j < c1; ++j)
30        {
31            cout << "Enter element a" << i + 1 << j + 1 << " : ";
32            cin >> a[i][j];
33        }
34
35    // Storing elements of second matrix.
36    cout << endl << "Enter elements of matrix 2:" << endl;
37    for(i = 0; i < r2; ++i)
38        for(j = 0; j < c2; ++j)
39        {
40            cout << "Enter element b" << i + 1 << j + 1 << " : ";
41            cin >> b[i][j];
42        }
43
44    // Initializing elements of matrix mult to 0.
45    for(i = 0; i < r1; ++i)
46        for(j = 0; j < c2; ++j)
47        {
48            mult[i][j]=0;
49        }
50
51    // Multiplying matrix a and b and storing in array mult.
52    for(i = 0; i < r1; ++i)
53        for(j = 0; j < c2; ++j)
54            for(k = 0; k < c1; ++k)
55            {
56                mult[i][j] += a[i][k] * b[k][j];
57            }
58
59    // Displaying the multiplication of two matrix.
60    cout << endl << "Output Matrix: " << endl;
61    for(i = 0; i < r1; ++i)
62    for(j = 0; j < c2; ++j)
63    {
64        cout << " " << mult[i][j];
65        if(j == c2-1)
66            cout << endl;
67    }
68
69    return 0;
70}
71

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