MATRIX MULTIPLICATION SOURCE CODE

/*MATRIX MULTIPLICATION.CPP*/
#include "calculator.h"
#include <iostream>
using namespace std;
void ScientificCalculator::matrix_multiplication()
{
 int a[10][10], b[10][10], mul[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;
/* If colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix again. */
    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;
    }
/* Storing elements of first matrix. */
    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];
    }
/* Storing elements of second matrix. */
    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];
    }
/* Initializing elements of matrix mul to 0.*/
    for(i=0; i<r1; ++i)
    for(j=0; j<c2; ++j)
    {
       mul[i][j]=0;
    }
/* Multiplying matrix a and b and storing in array mul. */
    for(i=0; i<r1; ++i)
    for(j=0; j<c2; ++j)
    for(k=0; k<c1; ++k)
    {
        mul[i][j] = mul[i][j] + a[i][k] * b[k][j];
    }
/* Displaying the multiplication of two matrix. */
    cout<<endl<<"Output Matrix: "<<endl;
    for(i=0; i<r1; ++i)
    for(j=0; j<c2; ++j)
    {
        cout<<" "<<mul[i][j];
        if(j==c2-1)
            cout<<endl;
    }
}