H.A.6.1 o scope

SCOPE AND VALUE PARAMETERS

// scope.cpp

#include <iostream.h>

const int NUM = 21; // a global constant

void one (int); // function prototypes do not need identifiers

void two (int, int); // but they do need ;'s at the end of each line

void three ();

main()

{

int a = 2, b = 5;

one (a);

two (a,b);

cout << a << " " << b << endl;

three ();

cout << a << endl;

return 0;

}

void one (int s) // notice lack of ;

{

cout << s << endl;

s *= 3;

cout << s << endl;

cout << NUM << endl; // use of a global constant

}

void two (int a, int b) // a and b are local identifiers

{

a += 2;

b *= a;

cout << a << endl;

cout << b << endl;

}

void three()

{

int a = 7;

cout << a << endl;

}

Run Output:

2 5