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 6 21 4 20 2   5 7 2