how to declare variable in c++ i dont want to define it so it should not consume any memory just declaration? -

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When we write int, the compiler gives memory to int, but now I just want to say to the compiler that the variable integer But

If it is a global variable, use it extract To make it a pure announcement: 

  extern int a;   
 It will still need to be defined somewhere, if the program uses it.  
 If this is a local variable, you can not declare it without defining it; This will be made when the program will reach the announcement.

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