Question

有人能告诉我为什么我想出的Ruby on Rails解决方案是返回IF语句的输出而不管控制台中写的是什么？（如果你用“西班牙语”回答问题，你仍然得到一个“Bonjour！”作为回报......

作业2：全球问候

询问用户他们将如何做喜欢受到欢迎。

如果他们说“用法语”，请回复与“卓悦！”

如果他们说“用西班牙语”，请回复与“Hola！”

如果他们说“在南非荷兰语”，请回复与“你好！”

用“呃，嗨？”处理所有其他输入

    for blocks in cave_block1S_pos:
        screen.blit(cave_block,blocks)
        if move_playerR==True:
            cave_block1S_pos[0]-=5

    for blocks in cave_block2S_pos:
        screen.blit(cave_block,blocks)
    for blocks in cave_block3S_pos:
        screen.blit(cave_block,blocks)

#cave.append([random.randint(player_imgS_pos[0]-512,player_imgS_pos[1]+684), random.randint(player_imgS_pos[0]-512,player_imgS_pos[0]+384)])
    #for rocks in cave:
        #screen.blit(cave_block, rocks)
        #if move_playerR==True:
            #rocks[0]+=5

    if backgrounS_pos[0]>=32:
        backgrounS_pos[0]=32

    if backgrounS_pos[0]<=-905:
        backgrounS_pos[0]=-905

    if backgrounS_pos[1]>=32:
        backgrounS_pos[1]=32

    if backgrounS_pos[1]<=-470:
        backgrounS_pos[1]=-470

    if move_playerR==True:
        backgrounS_pos[0]-=5

    if move_playerL==True:
        backgrounS_pos[0]+=5

    if move_playerD==True:
        backgrounS_pos[1]-=5

    if move_playerU==True:
        backgrounS_pos[1]+=5

    print(backgrounS_pos)

    for event in pygame.event.get():
        if event.type == pygame.KEYDOWN:
            if event.key==K_ESCAPE:
                pygame.quit()
                exit(0)

            if event.key==K_w:
                move_playerU=True

            if event.key==K_a:
                move_playerL=True

            if event.key==K_s:
                move_playerD=True

            if event.key==K_d:
                move_playerR=True

        if event.type==pygame.KEYUP:
            if event.key==K_w:
                move_playerU=False

            if event.key==K_a:
                move_playerL=False

            if event.key==K_s:
                move_playerD=False

            if event.key==K_d:
                move_playerR=False

        if event.type==pygame.QUIT:
            pygame.quit
            exit(0)
    pygame.display.update()

Answer 1

使用=进行作业。

您需要==，例如：

puts "How would you like to be greated?"
greet = gets.chomp

if greet == "in French"
    puts "Bonjour!"
elsif greet == "in Spanish"
    puts "Hola!"
elsif greet == "in Afrikaans"
    puts "Hallo!"
else
    puts "Uh, hi?"
end

您还可以使用case声明：

puts "How would you like to be greated?"
greet = gets.chomp

case greet 
when "in French"
    puts "Bonjour!"
when "in Spanish"
    puts "Hola!"
when "in Afrikaans"
    puts "Hallo!"
else
    puts "Uh, hi?"
end

如果您将它与正则表达式结合使用，您还可以捕捉不同的拼写或句子：

puts "How would you like to be greated?"
greet = gets.chomp

case greet 
when /French/i
    puts "Bonjour!"
when /Spanish/i
    puts "Hola!"
when /Afrikaans/i
    puts "Hallo!"
else
    puts "Uh, hi?"
end

Answer 2

=是一个赋值运算符，==用于比较

if "in French" == "in French"  // returns true
    puts "Bonjour"
else
    puts "Uh, hi?"

value = 10 // assign 10 to the variable value
puts value //print 10

if / elsif / else Ruby错误

2 个答案: