round() 函数把一个数字舍入为最接近的整数。
round()
n = Float.round(x)
var a = Float.round(3.5);var b = Float.round(3.4);
var a = Float.round(3.5);
var b = Float.round(3.4);
a = 4b = 3
a = 4
b = 3