A4-流程控制-選擇結構

int a = Convert.ToInt32(textBox1.Text);

switch (a)

{

case int n when (n <= 520000):

break;

case int n when (n >= 520000 && n <=1170000 ):

break;

case int n when (n >= 520000 && n<=2350000):

break;

case int n when (n <= 520000):

break;

case int n when (n <= 520000):

break;

default:

break;

}