CODEWITHSUNDEEP
c#windows-8
user3814247
user3814247

Reputation: 49

C# String.Format to One Decimal Place

I'm trying to format a toString to one decimal place but it keeps going to something like 21.0445445454. Here's the line of code please let me know what I'm doing wrong

 double heightInchToFoot = (12 * Convert.ToDouble(heightFtBox.Text)) +Convert.ToDouble(heightInchBox.Text);
        double bmi = (Convert.ToDouble(weightBox.Text) * 703) / (heightInchToFoot * heightInchToFoot);
        bmiDisplay.Text = String.Format("{0:0.0}", bmi.ToString());//This is the line of code I'm referring to

Upvotes: 0

Views: 3245

Answers (1)

user2864740
user2864740

Reputation: 61975

The problem is the use of bmi.ToString() which converts the double to a string using the default Double.ToString format/rules1. Because of that, the actual Format deals with a string (which doesn't understand decimal formatting) and not the actual double value.

Instead, it should be

String.Format("{0:0.0}", bmi)

or 

bmi.ToString("0.0")

1 From the documentation:

The Double.ToString() method formats a Double value in the default ("G", or general) format of the current culture.

Upvotes: 5

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