C++ : matrix display using class

#include<iostream>
#include<conio.h>

using namespace std;

class matrix
{
int a;
int b;
int A[3][3];
public:
void readmatrix();
void displaymatrix();
};

void matrix::readmatrix()
{
for(int i=1;i<=3;i++)
{
for(int j=1;j<=3;j++)
{
cout<<"A["<<i<<"]["<<j<<"] : ";
cin>>A[i][j];
}
}
}
void matrix::displaymatrix()
{
for(int i=1;i<=3;i++)
{
for(int j=1;j<=3;j++)
{
cout<<" "<<A[i][j];
}
cout<<endl;
}

}



int main()
{

matrix m;
m.readmatrix();
m.displaymatrix();
getch();
return(0);
}