Switch: Multiple values in one case?

Question

I have the following piece of code, but yet when I enter "12" I still get "You an old person". Isn't 9 - 15 the numbers 9 UNTIL 15? How else do I handle multiple values with one case?

  int age = Convert.ToInt32(txtBoxAge.Text);    switch (age)     {     case 1 - 8:   MessageBox.Show("You are only " + age + " years old\n You must be kidding right.\nPlease fill in your *real* age.");     break;     case 9 - 15:   MessageBox.Show("You are only " + age + " years old\n That's too young!");     break;     case 16-100:   MessageBox.Show("You are " + age + " years old\n Perfect.");     break;     default:   MessageBox.Show("You an old person.");     break;   } 

Answer 1

1 - 8 = -7

9 - 15 = -6

16 - 100 = -84

You have:

case -7:     ...     break; case -6:     ...     break; case -84:     ...     break; 

Either use:

case 1: case 2:  case 3: 

etc, or (perhaps more readable) use:

if(age >= 1 && age <= 8) {      ... } else if (age >= 9 && age <= 15) {      ... } else if (age >= 16 && age <= 100) {      ... } else {      ... } 

etc