在Scratch中将大小写从低到高更改

问题描述

我的侄女正试图从头开始做学校作业，并寻求帮助。她的任务是创建一个脚本，该脚本使用混合了数字和小写字母的密码，并且必须将字母从小写改为大写。我以前从未使用过刮擦。.我已尽力而为，但不确定在哪里出错。我将evengroup设置为包含密码的变量。我创建了一个新功能，该功能基于在网上找到的内容，并将其合并到左侧密码的迭代中。有什么想法吗？

解决方法

尝试一下：

当字符串中包含不停止的数字时出现了问题，因此我将其修复。

并查看discussion on scratch

,

我定义了两个自定义块：

位置

将变量position$设置为character中text的位置。 0 表示在给定文本中找不到给定字符。我们将使用该块根据一组小写字母检查密码的每个字符。

大写

将密码的每个字符传递给 position 块。如果 position$ 不是 0，则当前字符是小写字母，并在大写字母集中查找相应的字符。否则保留当前字符。 uppercase$ 变量累积这些检查的结果。

define position [character] [text]
    set [position$ v] to []
    set [pos_i v] to [0]
    repeat until <<(position$) > [0]> or <(pos_i) > (length of (text))>>
        if <(letter (pos_i) of (text)) = (character)> then
            set [position$ v] to (pos_i)
        end
        change [pos_i v] by [1]
    end
    
define uppercase [text]
    set [uppercase$ v] to []
    set [upp_i v] to [1]
    repeat (length of (text))
        position (letter (upp_i) of (text)) [abcdefghijklmnopqrstuvwxyz]
        if <(position$) > [0]> then
            set [uppercase$ v] to (join (uppercase$) (letter (position$) of [ABCDEFGHIJKLMNOPQRSTUVWXYZ])
        else
            set [uppercase$ v] to (join (uppercase$) (letter (upp_i) of (text))
        end
        change [upp_i v] by [1]
    end
    
when green flag clicked
ask [Enter your password] and wait
uppercase (answer)
say (uppercase$)

---

如果你想看看这在 Scratch3 中的样子，下面有一个片段：

<script src="https://github.com/scratchblocks/scratchblocks/releases/download/v3.5.2/scratchblocks-v3.5.2-min.js"></script>
<pre class="blocks">
define position [character] [text]
    set [position$ v] to []
    set [pos_i v] to [0]
    repeat until <<(position$) > [0]> or <(pos_i) > (length of (text))>>
        if <(letter (pos_i) of (text)) = (character)> then
            set [position$ v] to (pos_i)
        end
        change [pos_i v] by [1]
    end
    
define uppercase [text]
    set [uppercase$ v] to []
    set [upp_i v] to [1]
    repeat (length of (text))
        position (letter (upp_i) of (text)) [abcdefghijklmnopqrstuvwxyz]
        if <(position$) > [0]> then
            set [uppercase$ v] to (join (uppercase$) (letter (position$) of [ABCDEFGHIJKLMNOPQRSTUVWXYZ])
        else
            set [uppercase$ v] to (join (uppercase$) (letter (upp_i) of (text))
        end
        change [upp_i v] by [1]
    end
    
when green flag clicked
ask [Enter your password] and wait
uppercase (answer)
say (uppercase$)
</pre>
<script>
scratchblocks.renderMatching('pre.blocks',{style: 'scratch3'});
</script>