Flowgorithm - Change a character in a string

Question

Flowgorithm - Change a character in a string

110 Views Asked by Snap At 17 December 2023 at 07:45

Is there a way to change a single character in a String? In C programming you could do:

char s[4] = "abc";
s[0]='c';

Is there a way to manipulate a string in flowgorithm? I get an error if I try it:

enter image description here

There is always the error that the string is not an array. Maybe there is someone who got a hint to solve it.

Original Q&A

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**Costantino Grana** · Answer 1 · 2023-12-29T17:39:41.553000

Flowgorithm is often lacking in many aspects. Strings are not Arrays and cannot be indexed for writing. No idea why! But you can use Char() to get the i-th character in a string (whose type is a String with length 1). You can convert a 1 character long String into its ASCII code with ToCode() and you can move back from ASCII code to 1 character long String with ToChar(). Additionally Arrays (also parameters) are mutable, while Strings are immutable. We can then make a StringToArray() function:

then a ArrayToString() function:

Then put them together in a SetChar() function:

You can use it like this:

The XML version:

    <function name="Main" type="None" variable="">
        <parameters/>
        <body>
            <declare name="x" type="String" array="False" size=""/>
            <assign variable="x" expression="&quot;Test 123&quot;"/>
            <assign variable="x" expression="SetChar(x, 4, &quot;0&quot;)"/>
            <output expression="x" newline="True"/>
        </body>
    </function>
    <function name="ArrayToString" type="String" variable="s">
        <parameters>
            <parameter name="a" type="Integer" array="True"/>
        </parameters>
        <body>
            <declare name="s" type="String" array="False" size=""/>
            <declare name="j" type="Integer" array="False" size=""/>
            <assign variable="s" expression="&quot;&quot;"/>
            <for variable="j" start="0" end="Size(a)-1" direction="inc" step="1">
                <assign variable="s" expression="s &amp; ToChar(a[j])"/>
            </for>
        </body>
    </function>
    <function name="SetChar" type="String" variable="s">
        <parameters>
            <parameter name="s" type="String" array="False"/>
            <parameter name="i" type="Integer" array="False"/>
            <parameter name="c" type="String" array="False"/>
        </parameters>
        <body>
            <declare name="a" type="Integer" array="True" size="Len(s)"/>
            <call expression="StringToArray(s,a)"/>
            <assign variable="a[i]" expression="ToCode(c)"/>
            <assign variable="s" expression="ArrayToString(a)"/>
        </body>
    </function>
    <function name="StringToArray" type="None" variable="">
        <parameters>
            <parameter name="s" type="String" array="False"/>
            <parameter name="a" type="Integer" array="True"/>
        </parameters>
        <body>
            <declare name="j" type="Integer" array="False" size=""/>
            <for variable="j" start="0" end="Len(s)-1" direction="inc" step="1">
                <assign variable="a[j]" expression="ToCode(Char(s,j))"/>
            </for>
        </body>
    </function>

Flowgorithm - Change a character in a string

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