Program:

    #include<iostream.h>
    #include<conio.h>
    #define size 5

    class array
    {
    private:
    int I,j,k,x[size][size],y[size][size],z[size][size];
    public:
    void enter(int x[size][size],int,int);
    void display(int x[size][size],int,int);
    void mat_multiply(int x[size][size],int y[size][size],int z[size][size],int,int,int);
    };
    void array::enter(int x[size][size],int row,int colm)
    {
    for(I=0;I<row;I++)
    {
    for(j=0;j<colm;j++)
    cin>>x[I][j];
    }
    }
    void array::display(int x[size][size],int row,int colm)
    {
    for(I=0;I<row;I++)
    {
    for(j=0;j<colm;j++)
    cout<<x[I][j]<<'\t';
    cout<<endl;
    }
    }
    void array::mat_multiply(int x[size][size],int y[size][size],int z[size][size],int row1,int colm1,int colm2)
    {
    for(I=0;I<row1;I++)
    {
    for(j=0;j<colm2;j++)
    {
    z[I][j]=0;
    for(k=0;k<colm1;k++)
    z[I][j]+=x[I][k]*y[k][j];
    }
    }
    }
    void main()
    {
    array obj;
    int a[size][size],b[size][size],c[size][size],row1,colm1,row2,colm2;
    clrscr();
    cout<<"\nEnter the order of First matrix < "<<size<<" * "<<size<<"\n";
    cin>>row1>>colm1;
    cout<<"\nEnter the order of Second matrix < "<<size<<" * "<<size<<"\n";
    cin>>row2>>colm2;
    if(colm1==row2)
    {
    cout<<"\nEnter the first matrix of order "<<row1<<" * "<<colm1<<endl;
    obj.enter(a,row1,colm1);
    cout<<"\nEnter the second matrix of order "<<row2<<" * "<<colm2<<endl;
    obj.enter(b,row2,colm2);
    clrscr();
    cout<<"\nFirst matrix is \n\n";
    obj.display(a,row1,colm1);
    cout<<"\nSecond matrix is \n\n";
    obj.display(b,row2,colm2);
    obj.mat_multiply(a,b,c,row1,colm1,colm2);
    cout<<"\nMultiplication of two matrices is\n\n";
    obj.display(c,row1,colm1);
    }
    else
    cout<<"Matrix multiplication is not possible";
    getch();
    }