不管是整数，还是浮点数，都可以使用下划线来分隔数字。
|
|
value2 = 1_000_000.000_000_1
var
value3:
Int
= 1_0_0_0_1
|
|
|
value2 = 1_000_000.000_000_1
var
value3:
Int
= 1_0_0_0_1
|
