Mega Code Archive
A scoping example
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#include <iostream>
using std::cout;
using std::endl;
void useLocal( void );
void useStaticLocal( void );
void useGlobal( void );
int x = 1;
int main()
{
int x = 5;
cout << x << endl;
{
int x = 7;
cout << "local x in main's inner scope is " << x << endl;
}
cout << x << endl;
useLocal();
useStaticLocal();
useGlobal();
useLocal();
useStaticLocal();
useGlobal();
cout << x << endl;
return 0;
}
void useLocal( void )
{
int x = 25;
cout << "local x is " << x << " on entering useLocal" << endl;
x = x + 20;
cout << "local x is " << x << " on exiting useLocal" << endl;
}
void useStaticLocal( void )
{
static int x = 50;
cout << "local static x is " << x << " on entering useStaticLocal"
<< endl;
x = x + 20;
cout << "local static x is " << x << " on exiting useStaticLocal"
<< endl;
}
void useGlobal( void )
{
cout << "global x is " << x << " on entering useGlobal" << endl;
x = x + 20;
cout << "global x is " << x << " on exiting useGlobal" << endl;
}
5
local x in main's inner scope is 7
5
local x is 25 on entering useLocal
local x is 45 on exiting useLocal
local static x is 50 on entering useStaticLocal
local static x is 70 on exiting useStaticLocal
global x is 1 on entering useGlobal
global x is 21 on exiting useGlobal
local x is 25 on entering useLocal
local x is 45 on exiting useLocal
local static x is 70 on entering useStaticLocal
local static x is 90 on exiting useStaticLocal
global x is 21 on entering useGlobal
global x is 41 on exiting useGlobal
5
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