How to get data type of var

Question

I am trying to get a data type (int, decimal etc.) of a variable of var {type}:

var ratingSum = ratings.Sum(x=>x.Rating);//7
var ratingCount = ratings.Count();//2
decimal avgValue = decimal.Parse((ratingSum / ratingCount).ToString());//getting 3
var avgValue2 = (ratingSum / ratingCount).ToString(); //getting 3

I am unable to get exact value of avgValue or avgValue2 to check if it is of int or decimal. I always get 3 instead of 3.5.

If ratingSum is 8 and ratingCount is 2 my output should be 4 that means avgValue is of int.

The `GetType()` method can tell you the type of something. https://msdn.microsoft.com/en-us/library/system.object.gettype.aspx — Chris Zimmerman, Apr 30 '17 at 17:45

score 2 · Answer 1 · answered Apr 30 '17 at 17:45

2

It seems that you want to know why you have incorrect result instead of getting types of avgValue and avgValue2 (first is decimal, second is string). Here is explanation of your results.

Type of ratingSum is int, type of ratingCount is int too.

Division when both operands are int will produce int without fraction part of result. I.e. 7 / 2 = 3. To have float result you can use this trick:

var avg = 1.0 * ratingSum / ratingCount; // 3.5

answered Apr 30 '17 at 17:45

Uladzimir Palekh

1,846
13
16

Well I change my var data type to int and multiplied result by 1.0 but still getting result 3 – Chetu India Apr 30 '17 at 17:56
Please read my answer again. You need to multiple first operand, not result. If you will multiple `3` to `1.0` you will have `3.0`, not `3.5`. – Uladzimir Palekh Apr 30 '17 at 18:01

score 0 · Answer 2 · edited May 23 '17 at 12:02

0

to get type of the variable you can use the following:

variable.GetType().Name;

Reference :How can I get the data type of a variable in C#?

edited May 23 '17 at 12:02

Community

1
1

answered Apr 30 '17 at 17:45

Biswabid

1,378
11
26

score 0 · Answer 3 · edited May 23 '17 at 10:31

An integer division always returns an integer, tending to zero, so for example this would be the results of the following divisions:

5 / 3 = 1 instead of 1.66
2 / 4 = 0 instead of 0.5

You can force .NET to use float division by casting one of the integer to float or double, so the examples would be have to be written like this:

(float) 5 / 3 = 1.66
(float) 2 / 4 = 0.5

You can see more in the MSDN documentation for the division operator

There's an excellent answer for another StackOverflow question that explains why there's an integer division. Why integer division in c# returns an integer but not a float?

How to get data type of var

3 Answers3