So I recently had a practical exam in which I was told to execute a function of a menu oriented matrix operation program using classes. The code I made was supposedly wrong as I hadn't used classes the way they have to be used. Can anybody help me rectify the error here. I'm a noob (less than 2 months into C++) so please pardon any nooby mistakes. #include <iostream>    using namespace std;    class matrix3    {        int a[10][10],b[10][10],c[10][10],d[10][10],e[10][10],f[10][10],x,y,i,j;        public :            void values();            void transpose();            void sum();            void diff();    };    void matrix3::values()    {        cout << Enter the rows   ; cin >> x;        cout << Enter the columns   ; cin >> y;        cout << Enter elements of first matrix\n\n;        for (i=1; i<=x; i++)        {            for ( j=1; j<=y; j++)            {                cin >> a[i][j];            }        }        cout << Enter elements of second matrix\n\n;        for (i=1; i<=x; i++)        {            for (j=1; j<=y; j++)            {                cin >> c[i][j];            }        }    }    void matrix3::sum()    {        cout << Sum of Matrices 1 and 2 is\n;        for (i=1; i<=x; i++)        {            for ( j=1; j<=y; j++)            {                e[i][j]=a[i][j]+c[i][j];                cout << e[i][j] << ;            }            cout << endl;        }    }    void matrix3::diff()    {    cout << Difference of Matrices 1 and 2 (1-2) is\n;        for (i=1; i<=x; i++)        {            for ( j=1; j<=y; j++)            {                f[i][j] = a[i][j]-c[i][j];                cout << f[i][j] << ;            }            cout << endl;        }       }    void matrix3::transpose()    {        cout << transpose of the matrix is\n;        for ( i=1; i<=x; i++)        {            for ( j=1; j<=y; j++)            {                b[i][j] = a[j][i];                cout << b[i][j] << ;            }            cout << endl;        }        cout << Transpose of the second matrix is\n;        for ( i=1; i<=x; i++)        {            for ( j=1; j<=y; j++)            {                d[i][j] = c[j][i];                cout << b[i][j] << ;            }            cout << endl;        }    }    int main()    {        int input;        char ch;            matrix3 m;        m.values();        do         {        cout << Enter your choice\n;        cout <<  1. Sum of 1 and 2\n <<  2. Difference of 1 and 2\n <<  3. Transpose of both 1 amd 2\n;        cin >> input;        switch (input)        {            case 1:                m.sum();                break;            case 2:                m.diff();                break;            case 3:                m.transpose();                break;        }        cout << \nDo another y/n?;        cin >> ch;        }        while (ch!= 'n');        cout << \n;        system (pause);    return 0;    }
Matrix operations using classes
c++;object oriented;matrix