this post was submitted on 16 Nov 2023
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Programming

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Why does a control path not execute in this function? (lemm.ee)
submitted 1 year ago by milon@lemm.ee to c/programming@programming.dev
12 comments fedilink hide all child comments
 

In VS I am told this function "does not return a value in all control paths." A bot told me specifically the issue is with this line: else if (letter + key <= 90). It said that if the outcome results in letter + key equally exactly 90 then a value is not returned, but I thought that was covered where '<=' means 'less than or equals.'

char rotate(char letter, int key)
{
    if (isalpha(letter) == true)
    {
        if (letter + key > 90)
        {
            int overage = letter + key - 90;
            letter = 64 + overage;

            while (letter > 90)
            {
                overage = letter - 90;
                letter += overage;
            }

            return letter;
        }

        else if (letter + key &lt;= 90)
        {
            letter += key;
            return letter;
        }
    }

    else if (isalpha(letter) == false)
    {
        return letter;
    }
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[–] DmMacniel@feddit.de 9 points 1 year ago* (last edited 1 year ago) (6 children)

you are missing a returning else block.

[–] milon@lemm.ee 2 points 1 year ago (5 children)

Ah I see. I had a bad habit of using else if statements instead of else statements because I thought else if could be better in seeing the condition it's testing for so it was clearer. I get the logic is actually different now.

[–] heeplr@feddit.de 2 points 1 year ago* (last edited 1 year ago)

https://en.wikipedia.org/wiki/Defensive_programming might be an interesting read.

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