ruby 生成隨機字符串

產生隨機數 (Generating random number)

The task is to generate and print random number.

任務是生成并打印隨機數。

Generating random numbers means that any number can be provided to you which is not dependent on any pre-specified condition. It can be anything but must be within a range or limit. Ruby provides you the method for meeting the purpose.

生成隨機數意味著可以為您提供任何數字，而不依賴于任何預先指定的條件。 它可以是任何東西，但必須在范圍或限制之內。 Ruby為您提供了達到目的的方法。

Methods used:

使用的方法：

• puts: This method is used to put strings as messages on the screen for creating a better interaction with the user.

  puts ：此方法用于將字符串作為消息放在屏幕上，以與用戶建立更好的交互。

• gets: This method is used to take input from the user.

  gets ：此方法用于接收用戶的輸入。

• rand: This method is a pre-defined method in Ruby library which Is specifically defined for generating a random number. It can be invoked with parameters only otherwise it will give decimal results which are most of the times less than 0. The examples are:

  rand ：此方法是Ruby庫中的預定義方法，專門為生成隨機數而定義。 只能使用參數調用它，否則它將給出十進制結果，大多數情況下小于10。示例包括：

      rand(6)
  rand(0..6)
  rand(9..24)
  

Variables used:

使用的變量：

• up: It is used to store the upper limit.

  up ：用于存儲上限。

• lm: It is used to store the lower limit.

  lm ：用于存儲下限。

Ruby代碼生成隨機數 (Ruby code to generate random numbers)

=begin 
Ruby program to pick a random number from a range
=end
#input upper and lower limits
puts "Enter upper limit"
up=gets.chomp.to_i
puts "Enter lower limit"
lm=gets.chomp.to_i
#generate and print the random numbers
#between the given lower and upper limit
puts "The random numbers are..."
puts rand(lm..up)
puts rand(lm..up)
puts rand(lm..up)
puts rand(lm..up)
puts rand(lm..up)

Output

輸出量

Enter upper limit
100
Enter lower limit
50
The random numbers are...
91
98
96
95
84

Additional program:

附加程序：

The same concept can be applied to create a lucky draw program in which user will enter his/her name and they will get to know what they have won based on the random number generated by the program.

可以將相同的概念應用于創建幸運抽獎程序，在該程序中，用戶將輸入他/她的名字，并且他們將基于該程序生成的隨機數來知道自己贏了什么。

=begin 
Ruby program for Lucky draw.
=end
puts "Lucky Draw"
#input the name
puts "Enter your name"
name=gets.chomp
#generate a random number 
#pick a lucky number
chk=rand(8) #For getting a random value
#print the result based on the random
#generated lucky number
case chk
when 0
puts "#{name} got Maruti 800"
when 3
puts "#{name} won iphone X"
when 8
puts "#{name} won Rs 10"
when 6
puts "#{name} won Samsung A50"
else
puts "#{name}, Better luck next time"
end

Output

輸出量

RUN 1 : 
Lucky Draw
Enter your name
Sunaina
Sunaina, Better luck next time
RUN 2: 
Lucky Draw
Enter your name
Hargun
Hargun, Better luck next time
RUN 3 :
Lucky Draw
Enter your name
Kajal
Kajal won iphone X
RUN 4: 
Lucky Draw
Enter your name
Shivang
Shivang got Maruti 800

翻譯自: https://www.includehelp.com/ruby/generate-random-numbers.aspx

ruby 生成隨機字符串