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 11 months ago by milon@lemm.ee to c/programming@programming.dev
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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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[–] ShaunaTheDead@kbin.social 10 points 11 months ago* (last edited 11 months ago)

It's not at all necessary, but I find it makes much easier to read code if you instead only use if statements and just return early when you're in a function. For example, you could check isalpha(letter) == true is true then check letter + key &lt;= 90 do the letter += key; return letter; then since letter + key must be > 90 if it didn't already return a value, then you can do the while statement and return letter without needing an if statement at all. Then the isalpha(letter) == false is also unncessary, just return letter at the end.

Like this:

char rotate(char letter, int key)
{
  if (isalpha(letter)
  {
    if (letter  + key &lt;= 90)
    {
        letter += key;
        return letter;
    }

    do the while loop here
  }

  return letter;
}