c#.net

Ramana Reddy Vudumula

11y1.3kLearn iOS Programming

Q)what is difference between var keyword and data types? when we go for var and data types?

5 Replies

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Jignesh Trivedi11y ago
Hi,
Var introduced in c#3.0, this is way of defining variable implicitly typed and the compiler determines the type at the compile type. there is only difference between datatype and var is using var we are defining variable type implicitly and data type explicitly
var i = 50; // implicitly typed
int i = 50; //explicitly typed
The var keyword is very useful when:
1.We have a long class name so that our code is not so readable. var makes it short and sweet.
2.We use LINQ and anonymous types that help us reduce the code (reduce effort to create a new class).
hope this will help you.
Pradeep Shet11y ago
Hi,
var is a variant datatype that means its datatype is decided once you assign the value to compile type.
datatype are predefined which hold specific type of value.
Similar way there is dynamic which decides the variable datatype at runtime.
Vulpes11y ago
You might also like to check out my article on the subject:

http://www.c-sharpcorner.com/UploadFile/b942f9/when-should-you-use-the-var-keyword-in-C-Sharp/
Pankaj Kumar Choudhary11y ago
Hii Ramana var is implicit types and all other data types are explicit.
We we are using var keyword for a explicit data type such as (string,int etc) then there is no difference .
Exa : var as=12;
int ab=12; Both gives the result asme.
Now question rises when we should use a var keyword.
1. If you have simple value or predefine data type then you should use Data types(int ,string).
2. We you have a complex data then you should use var like(LINQ)
3. If you have a undefine type then you should use Var
Exa:
var obj = new { s = "asdf" };
Suraj Sahoo11y ago
Hello Ramana
There has been a lot of dispute over the use of var. My general rules are the following.
- When the type is obvious such as when the right hand of the assignment is a constructor, use var.
- When the type is complex to write, such as a LINQ query (the reason for var in the first place) use var.
- For ambivalent types (your Decimal being an example) where you want to make sure that your variable is correctly typed, spell it out.
- Anonymous types have to use var.
- In all other cases spell out the type.
Basically, the goal is to make it easier to read the code. If you feel that var suffices because the assignment is obvious, use var. Use the full type name as a hint for the reader when you feel it's necessary.
CC:--http://programmers.stackexchange.com/questions/42863/explicitly-defining-variable-data-types-vs-using-the-keyword-var
Hope this helps.
Accept if helps anyway.
Thanks