TV operations

#include <iostream>
#include <string>
using namespace std;
class TV {

    int height;
    int width;
    int screen_size;
    int channel;
    int volume;
    bool power = false;


public:
    TV(int _height, int _width, int _screen_size, int _channel) {

        height = _height;
        width = _width;
        screen_size = _screen_size;
        channel = _channel;
        volume = 0;
        power = 0;
    }

    void SetPower(int a) {
        if (a == 1) {
            power = true;
            cout << "TV is on" <<endl;
        }
        else if (a == 0) {

            power = false;
            cout << "TV is off" << endl;
        }
        else {
            cout << "ERROR 404 Command Not Found" << endl;
        }
    }
    void SetChannel(int b) {

        if (b < 7 ) {

            cout << "You are on channel" <<"  "<<b << endl;

        }
        else {

            cout << "Channel doesn't exist" << endl;

        }
        }
    void SetVolume(int c) {

        if (c == 1) {

            volume++;
            cout << volume << endl;

        }
        else if (c = 0, volume > 0) {
            volume--;
            cout << volume << endl;
        }

    }

};
int main(){
    int a;
    cin >> a;
    int b;
    cin >> b;
    int c;
    cin >> c;

    TV TV1(28,15,30,b);
    TV1.SetPower(a);
    TV1.SetVolume(c);
    TV1.SetChannel(b);

system("pause");
return 0;
}