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C++ extern keyword

VARAK-VURAK answered on September 21, 2022 Popularity 10/10 Helpfulness 2/10

answer C++ extern keyword

C++ extern keyword

Comment

extern int var;
int main(void)
{
  return 0;
}//success

/*
extern int var;
int main(void)
{
  var = 10;
  return 0;
}//error,
//Essentially, the var isn’t allocated any memory. And the program is trying to change the value to 10 of a variable that doesn’t exist at all.

//but

#include "somefile.h"
extern int var;
int main(void)
{
 var = 10;
 return 0;
}//success,Assuming that somefile.h contains the definition of var, this program will compile successfully.


*/

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: www.geeksforgeeks.org

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