小编Kua*_*Yao的帖子

我是红宝石的新手.我试着做一个简单的方法(带参数)调用.

class MeowEncoder
    def method(c)
        puts c
        end
    end

print "please enter the thing you want"
s = gets.chomp()
MeowEncoder.method(s)

它只传递参数并将其打印出来.但终端一直给我错误

:MeowEncoder.rb:9: undefined method `toBinary' for MeowEncoder:Class (NoMethodError)

这里发生了什么？

我做了一些改进.

class MeowEncoder
        def encode(n)
            toBianry(?n)
            puts ""
        end

        def toBinary(n)
            if n < 2
                print n
            else
                toBinary(n / 2)
                print n % 2
            end
        end
    end

    o = MeowEncoder.new


    print "please enter the thing you want: "
    s = gets.chomp()
    s.each_char{|c| o.encode(c)} #this doesn't work
    o.toBinary(212)  # this works …

我只是尝试使用ruby从project-euler解决问题#45.我知道这个方法.但我写了代码,它没有运行.我是ruby的新手,我不知道为什么后面会有这么多"结束"关键字(否则终端会抱怨)

这是代码:

class Test
    def initialize()

    end

    def Triangle(n)
        if 1 + 8*n < 0 then
            return false
        else
            i1 = 0.5 * (-1 + Math.sqrt(1 + 8*n))
            i2 = 0.5 * (-1 - Math.sqrt(1 + 8*n))
            cut_i1 = i1.to_i
            cut_i2 = i2.to_i
            if (cut_i1 == i1) & (i1 > 0)
                return true
            else if (cut_i2 == i1) & (i2 > 0)
                return true
            else
                return false
            end
        end
    end

    def Pentagonal(n)
        delta = 1 + 24*n
        if delta < …

我在PHP编码,这个奇怪的错误弹出.

if(isset($_GET["failauth"])){ ?>
    <div>Sorry, your user name or password is not correct. Please re-enter. </div>
    <form id="loginform" action="login.php" method="post">
<?php } 
else if(isset($_GET("usernotexist"))){ ?>
    <div>Sorry, the username is not found</div>
    <form id="signupform" action="login.php?signup=true" method="get">
<?php }     
else { ?>
    <form id="loginform" action="login.php" method="post">
<?php } ?>
        <div><input name="name" type="text" size="8" autofocus="autofocus" pattern="/^.{3,8}$/" /> <strong>User Name</strong></div>
        <div><input name="password" type="password" size="8" pattern="/^[0-9].{4,10}[^a-zA-Z0-9]$/" /> <strong>Password</strong></div>
        <div><input type="submit" value="Log in" /></div>
    </form>

第36行引用"else if"语句.我很好奇为什么它会超过第一个,但如果没有通过其他部分？它是否与语法原因有关因为我之前从未使用过if语句...