Sams Teach Yourself C in 21 Days

The C++ Programming Language 659

BD2

don’t spend this time going to and from the function because the function’s code is

placed directly in the listing. The tradeoff for this speed is program size. The code for the

function is duplicated in each place it is called. This means if you call an inline function

15 times, there will be 15 copies of the function’s code in your listing. Listing B2.6 pre-

sents a listing using inline functions.

LISTINGB2.6 inline.cpp. Using an inline function

1: //Using inline functions

2: #include <iostream.h>

3:

4: inline long square( long value )

5: {

6: return (value * value );

7: }

8:

9: inline long halve( long value )

10: {

11: return (value / 2);

12: }

13:

14: int main(int argc, char* argv[])

15: {

16: long nbr;

17:

18: cout <<”\nEnter a number: “;

19: cin >> nbr;

20:

21: cout <<”\n\nSquared: “ << square(nbr);

22: cout <<”\nHalved: “ << halve(nbr);

23:

24: cout <<”\nHalf the square: “;

25: cout << halve(square(nbr));

26:

27: cout << “\n\nDone!”;

28:

29: return 0;

30: }

Enter a number: 16

Squared: 256

Halved: 8

Half the square: 128

Done!

OUTPUT

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