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C++ TUTORIALS - C++Variable Scope

C++Variable Scope

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Initializing Local and Global Variables:

Data TypeInitializer
int 0
char '\0'
float 0
double 0
pointer NULL

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Local Variables:

#include <iostream>
using namespace std;
 
int main ()
{
  // Local variable declaration:
  int a, b;
  int c;
 
  // actual initialization
  a = 10;
  b = 20;
  c = a + b;
 
  cout << c;
 
  return 0;
}



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Global Variables:


#include <iostream>
using namespace std;
 
// Global variable declaration:
int g;
 
int main ()
{
  // Local variable declaration:
  int a, b;
 
  // actual initialization
  a = 10;
  b = 20;
  g = a + b;
 
  cout << g;
 
  return 0;
}


						


#include <iostream>
using namespace std;
 
// Global variable declaration:
int g = 20;
 
int main ()
{
  // Local variable declaration:
  int g = 10;
 
  cout << g;
 
  return 0;
}


						


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