Ruby：语法错误，意外的keyword_when，期待输入结束

Question

我想修改一个脚本来包含一个case块，但是每当我这样做，我似乎得到这个错误。我最初认为这是因为我错过了某个地方的结局，但我检查了我的整个代码，看起来好像很好。

工作（前加入的情况下）：

def determine_grade 
Console_Screen.cls #Clear the display area 
#To pass the test the player must correctly retype 3 sentences 
if $noRight >= 6 then 
#Inform the player of the good news 
print "You retyped " + $noRight.to_s + " sentence(s)" + 
"correctly. " 
puts "You have passed the typing test!\n\nPress Enter" + 
"to continue." 
else #The player has failed the test 
#Inform the player of the bad news 
print "You retyped " + $noRight.to_s + " sentence(s)" + 
"correctly. " 
puts "You have failed the typing test!\n\nPress Enter 
to continue." 
end 
end 
end 

后：

def determine_grade 
Console_Screen.cls #Clear the display area 
#To pass the test the player must correctly retype 6 sentences 
case $noRight 
when 9 || 10 
    print "You get an A!" 
    end 
when 8 
    print "You get a B!" 
    end 
when 7 
    print "You get a C." 
    end 
when 6 
    print "You get a D." 
    end 
when <= 5 
    print "You get an F." 
    end 
else 
    print "Error" 
    end 
end 
end 
end 

任何想法？

Answer 1

您不需要when块中的end语句。这就是抛弃解释器的原因。此外，您的多值when是错误的;它应该是when 9, 10而不是when 9 || 10，因为这将评估为真值。

删除这些和您的新代码应该等同于您的原始代码。

Answer 2

def determine_grade 
    Console_Screen.cls #Clear the display area 
    #To pass the test the player must correctly retype 6 sentences 
    print case $noRight 
     when 9..10 then "You get an A!" 
     when 8 then "You get a B!" 
     when 7 then "You get a C." 
     when 6 then "You get a D." 
     when -Float::INFINITY..5 then "You get an F." 
     else "Error" 
     end 
end