C#

days = entries[index].dateTime.Day;

average = sum of samples / number of samples

Aveg = total / days;

average = sum of samples / number of samples

Quote:

days = entries[index].dateTime.Day;

++days;

int index = entries.Count();

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Abdalla Ben Omran wrote:

does make that difference ?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

public static TheWeather GetAverageForMonth(List<TheWeather> entries, int year, int month)
{
    if (entries == null || entries.Count < 1)
    {
        return null;
    }
    int days = 0;
    int index = entries.Count();
    double total = 0.0;
    double Aveg = 0.0;

    for (index = 0; index < entries.Count; index++)
    {
        // this is your fix
        if (entries[index].dateTime.Year == year 
            && entries[index].dateTime.Month == month 
            // add this line so that it won't include an item without a value
            && entries[index].Actual_mean_temp > 0)
        {
            total += entries[index].Actual_mean_temp;
            // add the "+" to your operator, and only add 1
            days += 1;
        }
    }

    Aveg = total / days;
    return entries[index];
}

days += 1;    // it's just a count of the valid temperature entries

days++;

days = days + 1;