ADCChannel Constructor Validation

#include <iostream>
using namespace std;

// Write your ADCChannel class here

class ADCChannel{

 private:
 int channel;
 int resolution;

 static int valid_channel(int x)
 {
    if(x < 0)  x =0;
    else if(x>15) x =15;
    return x;
 }
 static int  valid_resolution( int r)
 {
    switch(r)
    {
        case 8:
        r =8;
        break;
        case  10:
        r =10;
        break;
        case 12:
        r = 12;
        default:
        r=12;

    }
    return r;
 }
 public:
 ADCChannel(int ch , int res):channel(valid_channel(ch)),resolution(valid_resolution(res))
 { }

 void print()
 {
    cout<<"CH="<<channel<<" "<<"RES="<<resolution;
 }

};


int main() {
    int ch, res;
    cin >> ch >> res;

    ADCChannel adc(ch, res);
    adc.print();

    return 0;
}