CODEWITHSUNDEEP
c#
Johnny Depp
Johnny Depp

Reputation: 25

Trying to output letter grades

I am in trying to create a form that converts decimals to a letter grade. The issue is that the letterGrade does not exist in that current context of the method but how do I essentially get it to "return". I am new to C#. I will appreciate any help I can get.

    private void txtNumberGrade_TextChanged(object sender, EventArgs e)
    {
        txtNumberGrade.Focus();
    }

    private void txtLetterGrade_TextChanged(object sender, EventArgs e)
    {

//error at this line below

    txtLetterGrade.Text = letterGrade;

//error at this line above

    }

    private void btnCalculate_Click(object sender, EventArgs e)
    {
        decimal score = Convert.ToDecimal(txtNumberGrade.Text);
        string letterGrade = "";
        if (score >= 90)
        {
            letterGrade = "A";
        }
        else if (score >= 80)
        {
            letterGrade = "B";
        }
        else if (score >= 70)
        {
            letterGrade = "C";
        }
        else if (score >= 60)
        {
            letterGrade = "D";
        }
        else if (score >= 0)
        {
            letterGrade = "F";
        }
        else {
            letterGrade = "Z";
        }


    }
}

Upvotes: 1

Views: 212

Answers (1)

Trevor
Trevor

Reputation: 8004

What you could do is create a function to return the grade you need. Below I am using the Decimal.TryParse Method which converts the string representation of a number to its Decimal equivalent and a return value indicates whether the conversion succeeded or failed. If it did succeed, then score would have this value.

 private static string GetGrade(string decGrade)
 {
    if (decimal.TryParse(decGrade, out decimal score))
    {
        if (score >= 90)
        {
           return "A";
        }
        else if (score >= 80)
        {
           return "B";
        }
        else if (score >= 70)
        {
           return "C";
        }
        else if (score >= 60)
        {
           return "D";
        }
        else if (score >= 0)
        {
           return "F";
        }
        else 
        {
           return "Z";
        }
    }
    else { return "NA"; }
 }

Now you can call this in the TextChanged event as such:

private void txtNumberGrade_TextChanged(object sender, EventArgs e)
{
   txtLetterGrade.Text = GetGrade(txtNumberGrade.Text);      
}

References:

Decimal.TryParse Method - https://learn.microsoft.com/en-us/dotnet/api/system.decimal.tryparse?view=netcore-3.1

Upvotes: 1

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