Ruby Float round() 方法与示例

round()是一个浮点类方法，它返回一个浮点值，它以 n 位十进制数字精度四舍五入到最接近的值。

Syntax: float.round()

Parameter: float value as argument

Return: Float value rounded to nearest precision
If precision is -ve : integer with at least ndigits.abs trailing zeros
If ndigits is +ve : a floating-point number, otherwise integer

示例 #1：

# Ruby code for round() method
  
# declaring float value
a = 0.767
  
# declaring float value
b = 2999.011
  
# rounding the float value
puts "rounding a : #{a.round}\n\n"
  
# rounding the float value
puts "rounding b : #{b.round}\n\n"

输出 ：

rounding a : 1

rounding b : 2999

示例 #2：

# Ruby code for round() method
  
# declaring float value
a = 0.767
  
# declaring float value
b = 2999.011
  
# declaring float value
c = 2.0000
  
# rounding the float value
puts "round a : #{a.round(2)}\n\n"
  
# rounding the float value
puts "round b : #{b.round(-2)}\n\n"
  
# rounding the float value
puts "round c : #{c.round(0)}\n\n"

输出 ：

round a : 0.77

round b : 3000

round c : 2