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C++ Variable( आओ जाने वेरिएबल्स के बारे में)

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आज मैं आपको कुछ C++ के variables  के बारे में बताने जा रहा हूँ सबसे पहले हमारे दिमाग में ये सवाल आता है कि वेरिएबल्स क्या होते और इनका programming  क्या use होता है | 


C++ Variable

A variable is a name of memory location(ये एक मेमोरी लोकेशन है ). It is used to store data(ये डाटा को स्टोर करने के लिये इस्तेमाल होता है ). Its value can be changed and it can be reused many times.(ये वेरिएबल्स को एक बार store करने पर आप इसे बार बार use कर सकते है )

It is a way to represent memory location through symbol so that it can be easily identified.


Let's see the syntax to declare a variable:

type variable_list;(टाइप वेरिएबल लिस्ट )    
ये एक सिंटेक्स है की हम वेरिएबल्स को कैसे लिख सकते है जैसे आप देखे। .... 


  1. int x;       (यहाँ पर int एक डाटा टाइप है और x एक वेरिएबल है )
  2. float y;    (यहाँ पर float एक डाटा टाइप है और y एक वेरिएबल है )
  3. char z;     (यहाँ पर char एक डाटा टाइप है और z एक वेरिएबल है )



We can also provide values while declaring the variables as given below:

  1. int x=5,b=10;  //declaring 2 variable of integer type    
  2. float f=30.8;    
  3. char c='A';    


Rules for defining variables

A variable can have alphabets, digits and underscore.

A variable name can start with alphabet and underscore only. It can't start with digit.

No white space is allowed within variable name.

A variable name must not be any reserved word or keyword e.g. char, float etc.

Valid variable names:

  1. int a;    
  2. int _ab;    
  3. int a30;    

Invalid variable names:


  1. int 4;    
  2. int x y;    
  3. int double


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