C++ Storage Classes

{
   int mount;
   auto int month;
}

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The register Storage Class

{
   register int  miles;
}

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The static Storage Class

#include <iostream>
 
// Function declaration
void func(void);
 
static int count = 10; /* Global variable */
 
main()
{
    while(count--)
    {
       func();
    }
    return 0;
}
// Function definition
void func( void )
{
    static int i = 5; // local static variable
    i++;
    std::cout << "i is " << i ;
    std::cout << " and count is " << count << std::endl;
}

						

i is 6 and count is 9
i is 7 and count is 8
i is 8 and count is 7
i is 9 and count is 6
i is 10 and count is 5
i is 11 and count is 4
i is 12 and count is 3
i is 13 and count is 2
i is 14 and count is 1
i is 15 and count is 0

						
The extern Storage Class

#include <iostream>
 
int count ;
extern void write_extern();
 
main()
{
   count = 5;
   write_extern();
}

						

#include <iostream>
 
extern int count;
 
void write_extern(void)
{
   std::cout << "Count is " << count << std::endl;
}

						

$g++ main.cpp support.cpp -o write

						

$./write
5