How to Resolve the C# Compiler Error: 'Not All Code Paths Return a Value'?

Solving the C#compiler error: "Not all code path returns the value"

When using C#conditional statements, the common error message is "not all code path returns." This error occurs when the compiler detects the code execution path that may not be returned.

Question example:

Considering the following aimed to determine whether the integer is divided by all integers between 1 and 20:

Error reason:

<code class="language-c#">public static bool isTwenty(int num)
{
    for(int j = 1; j <= 20; j++)
    {
        if(num % j != 0)
        {
            return false;
        }
    }
}</code>

The reason why the error occurs is a Return statement that lacks the code in the process of processing the process without any conditions. This omissions mean that there is a potential code path, and the path will not return the value.

Solution:

In order to solve this problem, a Return statement is added after the cycle to handle the case without any conditions to check. This ensures that no matter which execution path is taken, the value will always return:

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