打印「輸入字符」a =如果（a =='b'）放「b被按下」結束

Question

我是Ruby的新學習者。我也試過

print "Enter a character " 
a = gets 
if (a == "b") 
    puts "b was pressed" 
end 

而這也

print "Enter a character " 
a = gets.to_s 
if (a == 'b') 
    puts "b was pressed" 
end 

Answer 1

你錯過了方法String#chomp。如下更改代碼：

print "Enter a character " 
a = gets.chomp 
if (a == "b") 
    puts "b was pressed" 
end 

現在運行代碼：

kirti@kirti-Aspire-5733Z:~/Ruby$ ruby so.rb 
Enter a character b 
b was pressed 
kirti@kirti-Aspire-5733Z:~/Ruby$ 

注：您的代碼不能正常工作，因爲a = gets實際上是分配"b\n"給變量a，這當然不等於"b"。但是使用#chomp會從字符串中刪除\n，您只需從命令提示符輸入並且會產生預期的輸出。