How do I round a variable answer to a string? (C#)

Question

1.33/5 (2 votes)

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I have a text box that is displaying an answer but the rounding is to several decimal places (~10). How can I have this set to 2 decimal places?

string answer = Convert.ToString(potentialEnergy);
     txtAns.Text = answer;

What I have tried:

string answer = Convert.ToString(potentialEnergy);
string answer = String.Format("%.2f", 5);
txtAns.Text = answer;

Posted 27-Jul-21 0:34am

Updated 28-Jul-21 23:37pm

2 solutions

Posted 27-Jul-21 0:41am

Comments

Maciej Los 27-Jul-21 8:15am

5ed!

TheRealSteveJudge 27-Jul-21 8:23am

Thank you!

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Richard Deeming · Accepted Answer · 2021-07-28T23:37:00

Quote:

C#

string answer = String.Format("%.2f", 5);

That's not a valid .NET format string - there are no placeholders in the string, so the result will simply be "%.2f".

Have a read of the documentation:
Composite formatting | Microsoft Docs[^]
Standard numeric format strings | Microsoft Docs[^]
Custom numeric format strings | Microsoft Docs[^]

C#

string answer = string.Format("{0:F2}", potentialEnergy);

// Or preferably:
string answer = potentialEnergy.ToString("F2");