Validating an integer value against float in C#-CodePudding

I have a textbox where the user can enter a double point number . For eg:-

etc , the double numbers from the UI can be entered.

In my C# code I have to validate if the user has entered 1 or not.

1.00
1.0000
1.000000

are all considered as 1 and pass the validation . I was thinking of converting to Int

public bool Validate(double number)
{
  int v = Convert.ToInt32(number)
  if(v == 1)
   return true;
}

But the problem is I will lose precision , both 1.00 and 1.001 will result as 1 and incorrectly 1.001 will be returned as true which I dont need. How to check if the user has entered 1.00,1.000,...etc from UI in C#?

Edit : I dont need true for numbers like 1.23, 1.001 etc

CodePudding user response：

Comparing the value to 1.0 should do the trick:

bool isOne = val == 1.0;

(Equality comparison of floating-point numbers can be tricky, but this one works the way you'd expect.)

Edit: Using 1 instead of 1.0 also works, as Matthew Watson suggested in the comments.

CodePudding user response：

You can use decimal data type

public bool Validate(double number)
{
    var num = decimal.Parse(number.ToString());
    if(num == 1)
        return true;
    return false;
}

CodePudding user response：

You could substract the reference number and check if the result is 0.0:

public bool Validate(double number)
{
    double rest = number - 1;
    return rest == 0.0;
}