What's the difference between char and int in a switch case?

Question

I started C++ recently and while learning switch case, I got this doubt.
What\'s the difference if I use int or char in the following code :
int Fav_Car;

Answer 1

Why does it happen? Because in your switch case, you use a char, not int.

What is the difference between them?

1 //int
'1' // char 1
"1" // string 1

To use int

int a;
switch(a){
    case 1 :
}