如何在计算器程序中添加循环

我在ruby中创建了一个计算器。 我想知道如何把它放在一个循环中，所以我不必经常运行它。 我是编程新手，所以请理解我只是想学习。 我将不胜感激任何帮助。

puts "Hello, My name is Calvin The Calculator and I am a calculator that can do basic functions such as Adding, Subtracting, Multiplying and Dividing" puts "Press a and enter to enable my services" enable = gets.chomp if enable == "a" puts "Choose which operation you want to do. + for adding, - for subtraction, * for multiplication and / for division" else "Puts Im Waiting..." end which_operation = gets.chomp if which_operation == "+" puts "What is the first number you want to add" adding_first_number = gets.chomp.to_i puts "What is the second number you want to add to #{adding_first_number}" adding_second_number = gets.chomp.to_i puts "#{adding_first_number} + #{adding_second_number} is #{adding_first_number + adding_second_number}" else end if which_operation == "-" puts "What is the first number you want to subtract" subtracting_first_number = gets.chomp.to_i puts "What is the number you want to subtract from #{subtracting_first_number}" subtracting_second_number = gets.chomp.to_i puts "#{subtracting_first_number} - #{subtracting_second_number} is #{subtracting_first_number - subtracting_second_number}" else end if which_operation == "*" puts "What is the first number you want to multiple" multiplying_first_number = gets.chomp.to_i puts "What is the number you want to multiple #{multiplying_first_number} by" multiplying_second_number = gets.chomp.to_i puts "#{multiplying_first_number} * by #{multiplying_second_number} is #{multiplying_first_number * multiplying_second_number}" else end if which_operation == "/" puts "What is the first number to your divison question?" dividing_first_number = gets.chomp.to_i puts "What is the divisor?" dividing_second_number = gets.chomp.to_i puts "#{dividing_first_number} divided by #{dividing_second_number} is #{dividing_first_number / dividing_second_number}" else end 

Answer 1

例如：
until (which_operation = gets.chomp).empty? if which_operation == "+" ... end if which_operation == "-" ... end if which_operation == "*" ... end if which_operation == "/" ... end end
此循环将一直有效，直到您按Enter键而不输入任何文本。

PS：更好的用例运算符而不是多个if 。

PPS：所有代码，在循环添加和没有大小写操作符之后，将是：

 把“你好，我的名字是加尔文计算器，我是一个计算器，可以做基本的function，如添加，减去，乘法和除法”
把“按a然后输入以启用我的服务”

直到gets.chomp ==“a”
  把“我在等......”
结束
 puts“选择你想要做的操作。+用于添加， - 用于减法，*用于乘法和/用于除法”

直到（which_operation = gets.chomp）.empty？
   if which_operation ==“+”
    把“你想要添加的第一个数字是什么”
     adding_first_number = gets.chomp.to_i
    将“你要添加的第二个数字添加到＃{adding_first_number}”
     adding_second_number = gets.chomp.to_i
     put“＃{adding_first_number} +＃{adding_second_number}是＃{adding_first_number + adding_second_number}”
   elsif which_operation ==“ - ”
    把“你要减去的第一个数字是什么”
     subtracting_first_number = gets.chomp.to_i
    把“你要减去的数字是多少来减去＃{subtracting_first_number}”
     subtracting_second_number = gets.chomp.to_i
     puts“＃{subtracting_first_number}  - ＃{subtracting_second_number} is＃{subtracting_first_number  -  subtracting_second_number}”
   elsif which_operation ==“*”
    把“你想要的第一个数字是多少”
     multiplying_first_number = gets.chomp.to_i
    把“你想要的数字是多少＃{multiplying_first_number}”
     multiplying_second_number = gets.chomp.to_i
    把＃{multiplying_first_number} *乘＃{multiplying_second_number}是＃{multiplying_first_number * multiplying_second_number}“
   elsif which_operation ==“/”
    把“你的分歧问题的第一个数字是什么？”
     divide_first_number = gets.chomp.to_i
    提出“什么是除数？”
     divide_second_number = gets.chomp.to_i
     put“＃{divide_first_number}除以＃{divide_second_number}是＃{dividing_first_number / dividing_second_number}”
  结束
  把“\ n再试一次：”
结束