how to multiply two matrix

[sidhusaurabh]

how to multiply two matrix in c++?

[ndhamecha]

@sidhusaurabh
hi
i had made one program for matrix multiplication in c++.its definitely very helpful to you.
the code is as under.i hope you will get proper understanding from this program.

#include<iostream.h>
#include<conio.h>
 
void main()
{
    int a[10][10],b[10][10],c[10][10]={0};
    int i,j,k,r1,r2,c1,c2;
    clrscr();
 
    cout<<"\n Enter No Of Rows Of 1st Matrix:";
    cin>>r1; 
    cout<<"\n Enter No Of Columns Of 1st Matrix:";
    cin>>c1; 
 
    cout<<"\n Enter No Of Rows Of 2nd Matrix:";
    cin>>r2;
    cout<<"\n Enter No Of Columns Of 2nd Matrix:";
    cin>>c2;
 
    if(r1!=c2 ||c1!=r2)
    {
        cout<<"\n Matrix Multiplication Is Not Possible:";
        getch();
    }
    cout<<"\n Enter Element Of 1st Matrix:";
    for(i=0;i<r1;i++)
    {
        for(j=0;j<c1;j++)
        {
            cout<<"\n Enter Value Of a["<<i<<"]"<<"["<<j<<"]";
            cin>>a[i][j];
        }
    }
 
    cout<<"\n Enter Element Of 2nd Matrix:";
    for(i=0;i<r2;i++)
    {
        for(j=0;j<c2;j++)
        {
            cout<<"\n Enter Value Of b["<<i<<"]"<<"["<<j<<"]";
            cin>>b[i][j];
        }
    }
    cout<<"\n 1st Matrix is:";
    for(i=0;i<r1;i++)
    {
        for(j=0;j<c1;j++)
        {
        cout<<"\t"<<a[i][j];
        }
    cout<<"\n";
    }
 
    cout<<"\n 2nd Matrix is:";
    for(i=0;i<r2;i++)
    {
        for(j=0;j<c2;j++)
        {
        cout<<"\t"<<b[i][j];
        }
    cout<<"\n";
    }
 
 
    for(i=0;i<r1;i++)
    {
        for(j=0;j<c2;j++)
        {
            for(k=0;k<r2;k++)
            {
                c[i][j]=c[i][j]+(a[i][k] * b[k][j]);
            }
        }
    }
    cout<<"\n Result Matrix:";
    for(i=0;i<r1;i++)
    {
        for(j=0;j<c2;j++)
        {
            cout<<"\t"<<c[i][j];
        }
    cout<<"\n";
    }
getch();
}
 
 

- ndhamecha

[dkorchak79]

ndhamecha did you test your program when matrix size is greater than 10x10 ?
If you get the size of the matrix as an input please be so kind to allocate the memory dynamically