Question

matrix multiplication in c++??

Answer 1

use two dimensional array

Answer 2

#include<iostream>

using namespace std;

class matrix
{

public:
int a[3][3];

matrix()//default constructor
{
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
a[i][j]=0;
}
}
}
void set()// to set matrix elements
{
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
cout<<"\n Enter "<<i<<","<<j<<" element=";
cin>>a[i][j];
}
}
}
void show()// to show matrix elements
{
cout<<"\n Matrix is=\n";
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{

cout<<a[i][j]<<",";
}
cout<<"\n";
}
}

matrix operator*(matrix x)// overloading * for multiplication
{
matrix c;// this will hold our result
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
c.a[i][j]=0;
for(int k=0;k<3;k++)
{
c.a[i][j]=c.a[i][j]+a[i][k]*x.a[k][j];
}
}
}
return(c);

}
};

int main()
{
matrix a,b,c;
a.set();
b.set();
c=a*b;
/*
note that compiler will break this statement as
c=a.operator*(b);
this is how 2nd arg is passed.
and this is how object "a" acts as the calling object
*/

a.show();
b.show();
c.show();
}

Answer 3

thanks