conversion of double to int (Rounding)

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Hello Everyone,

I am a fresher.

I want to convert Double value into a integer value.
but there is a twist in it.

For example:-
3.45 should be converted into 3
3.5 should be converted into 4
3.55 should be converted into 4

Anything below .5 should be converted to its prior digit. and
Anything equal to or above .5 should be converted to its next digit.

Any links or suggestions are welcome..!!

Posted 2-Aug-12 20:45pm

vaibhav mahajan

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5 solutions

Solution 1

That is how rounding works now, isn't it ?

Posted 2-Aug-12 20:45pm

Christian Graus

Comments

vaibhav mahajan 3-Aug-12 2:49am

yes...bt

float _otif;

Convert.ToInt32(Convert.ToDouble(_otif);

but above statements are not working..!!

Christian Graus 3-Aug-12 2:51am

Well, your variable has no value, so it's hard to know what you've tried. Plus your code was missing a ).

float _otif = 3.49f;

int n = Convert.ToInt32(Convert.ToDouble(_otif));

works fine. When you get a compiler error, that means your code is broken, not that the conversion is not doing what you want.

vaibhav mahajan 3-Aug-12 3:07am

System.Math.Round(Convert.ToDouble(_otif));

it is not working..!!

Christian Graus 3-Aug-12 3:09am

Honestly, it's working as designed. Buy a damn book and stop telling us that things don't work. This also throws a compiler error. Rounding works EXACTLY as you requested, and you have no examples where it does not, just examples where your code is broken and does not compile.

Solution 3

simple method is

C#

double d = 3.49;
int i = Convert.ToInt32(d);

now i will be equal to 3;

ie if d<3.5 i will be 3
else 4

Posted 2-Aug-12 22:33pm

Jinu _George

Solution 4

If you really need such a (statistically 'poor') rounding behaviour then you have to specify the MidpointRounding.AwayFromZero mode in the Math.Round call (see, for instance "C# Rounding MidpointRounding.ToEven vs MidpointRounding.AwayFromZero"[^] at Stack Overflow)

Posted 2-Aug-12 22:46pm

CPallini

Solution 5

C#

double x=3.499;
int n = Convert.ToInt32(x);
Response.Write(n.ToString());

Posted 3-Aug-12 0:38am

Member 9052314

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Santhosh Kumar Jayaraman · Accepted Answer · 2012-08-02T22:20:00

Check this.

C#

static void Main(string[] args)
        {
            double d1 = 3.49;
            double d2 = 3.51;
            Console.WriteLine(d1);
            Console.WriteLine(d2);
            int i1 = Convert.ToInt32(Math.Round(d1, 0, MidpointRounding.ToEven));
            int i2 = Convert.ToInt32(Math.Round(d2, 0, MidpointRounding.ToEven));
            Console.WriteLine(i1);
            Console.WriteLine(i2);
            Console.Read();
        }