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Ruby中數字的冪 (Power of a number in Ruby)

The task to develop a program that prints power of a number in Ruby programming language.

開發可以用Ruby編程語言打印數字冪的程序的任務。

If we want to calculate the power of a number manually then we have to multiply the base to itself by exponent times which means that if the base is 3 and the exponent is 4, then power will be calculated as

如果要手動計算數字的冪，則必須將底數乘以自身乘以指數時間，這意味著如果底數為3且指數為4 ，則冪將計算為

power = 3*3*3*3, which will result in 81.

power = 3 * 3 * 3 * 3 ，結果為81。

Let us put the above logic into codes. We have used two methods to calculate power, one is by using user-defined function “pow” and one is with the help of ** operator. If you want to write code from scratch then the first method is appropriate for you.

讓我們將以上邏輯放入代碼中。 我們使用了兩種方法來計算功率，一種方法是使用用戶定義的函數“ pow”，另一種方法是借助**運算符。 如果您想從頭開始編寫代碼，則第一種方法適合您。

Methods used:

使用的方法：

• puts: This is used to create an interaction with the user by putting some message on the console.

  puts ：用于通過在控制臺上放置一些消息來與用戶進行交互。

• gets: This is used to take input from the user in the form of string.

  gets ：用于接收用戶以字符串形式的輸入。

• to_i: This method is used to convert any type into an integer type.

  to_i ：此方法用于將任何類型轉換為整數類型。

• pow: This is a user-defined function which takes two arguments and returns an integer value. It is defined purposefully for calculating power by taking base and exponent as an argument.

  pow ：這是一個用戶定義的函數，它帶有兩個參數并返回一個整數值。 它的定義是有目的的，以底數和指數為參數來計算功效。

Ruby代碼來計算數字的冪 (Ruby code to calculate power of a number)

=begin Ruby program to calculate power of a number. =enddef pow(a,b)power=1for i in 1..bpower=power*aendreturn power endputs "Enter Base:-" base=gets.chomp.to_iputs "Enter exponent:-" expo=gets.chomp.to_iputs "The power is #{pow(base,expo)}"

Output

輸出量

RUN 1: Enter Base:- 3 Enter exponent:- 5 The power is 243RUN 2: Enter Base:- 2 Enter exponent:- 3 The power is 8

Method 2:

方法2：

=begin Ruby program to calculate power of a number using ** operator. =endputs "Enter Base:-" base=gets.chomp.to_iputs "Enter exponent:-" expo=gets.chomp.to_ipower=base**expo puts "The power is #{power}"

Output

輸出量

RUN 1: Enter Base:- 5 Enter exponent:- 5 The power is 3125RUN 2: Enter Base:- 9 Enter exponent:- 2 The power is 81

翻譯自: https://www.includehelp.com/ruby/print-power-of-a-number.aspx

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