C# compiler error: “not all code paths return a value”

You’re missing a return statement.

When the compiler looks at your code, it’s sees a third path (the else you didn’t code for) that could occur but doesn’t return a value. Hence not all code paths return a value.

For my suggested fix, I put a return after your loop ends. The other obvious spot – adding an else that had a return value to the if-else-if – would break the for loop.

public static bool isTwenty(int num)
{
    for(int j = 1; j <= 20; j++)
    {
        if(num % j != 0)
        {
            return false;
        }
        else if(num % j == 0 && num == 20)
        {
            return true;
        }
    }
    return false;  //This is your missing statement
}