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Here is our Hello World program with six comments added:

/******************************************************************\ * * Program to demonstrate comments * * Written by J. R. Hubbard * * June 10, 1996 * * Version 1.5 \******************************************************************/ // This directive is needed to use tout #include <iostream.h> // This prints message: "Hello, World.": main0 /* now printing */ "Hello, World.\n"; /* change */ tout << // Some compilers will complain if you omit this line return 0; /* end of program */

This is a good example of an overly documented program. But it does illustrate some of the main uses of comments. The first comment is a 6-line header that identifies the program and programmer. Notice that the first two characters (at the beginning of line 1) are the slash-star / * and the last two characters on line 6 are the star-slash * /. The second comment begins with the double-slash on line 7. It illustrates a standard inline comment, positioned to the right of the statement that it describes. The third comment occupies all of line 8. It precedes the main ( > block and briefly describes what the program does. The fourth comment is imbedded inside the output statement. This is not recommended. The fifth comment is at the end of the output statement. It illustrates a common technique of software maintenance: the programmer leaves a message to himself to suggest a possible modification at a later date. The sixth comment, at the end of the program, has little value.

e 64

The next example shows our Hello, World. program with only C++-style comments:

The game of craps is played with two dice. Each time the pair of dice is tossed, the sum of the two numbers that come up is used. That sum will be an integer in the range 2 to 12 since the faces of each die are numbers 1 to 6. The player wins immediately if he tosses a 7 or an 11, and he loses immediately if he tosses a 2, 3, or 12. If he tosses a 4, 5, 6, 8, 9, or 10, then that number becomes his point. He then repeats tossing the dice until he wins by making his point or he loses by tossing a 7.

void initializeSeed(); int toss(); void win(); void lose(); main0 initializeSeed(); int point = toss(); if (point == 2 II point == 3 II point == 12) lose(); if (point == 7 II point == 11) win(); int t; for(x) { t = toss(); if (t == 7) lose(); if (t == point) win();

Hashing This is an algorithm that generates a unique numeric value based on the content of transaction data so that it can be veri ed by recipients using the same algorithm by comparing the value as sent to the value as calculated upon receipt (called a checksum) to ensure that content is unaltered Encryption and decryption Information may be sent in an illegible (encrypted) form between two (or more) parties On receipt, it can be decrypted using the appropriate key and returned to a legible form This is done by using an algorithm, such as hashing In practice, the process is as follows: 1 Every transform is made up of an algorithm attribute and holds any content parameters appropriate to the algorithm used.

unsigned seed = time(NULL);

f 400

srand (seed) ;

int toss0 int die1 = rand()/10%6 + 1; int die2 = rand()/10%6 + 1; int t = die1 + die2; tout C-C "\tYou tossed a ' << t -CC endl; return t;

void win0 tout << "\tYou won.\n"; exit(O);

void lose0 tout << "\tYou lost.\n"; exit(O); 3x.2 tossed a .4 Yuu t o s s e d a You tossed a 7 You Just. Y-011 b13sCsed a 8 Yuu +iLxsd3ed a 3, Yc J tossed a 6 Yau tossed a 3 Y%X..I t o s s e d a 8 Yuu wun.

g 144

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.. . .

4.21 Write a simple program like the one in Example 4.2 to check the identity: cos2x + sin2x = 1. 4.22 Write a simple program like the one in Example 4.2 to check the identity: