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DANVILLE AREA COMMUNITY COLLEGE
INTRODUCTION TO COMPUTER SCIENCE
MATH 110, Fall 2008

Homework 4 (Due Oct. 2 in class)

Read: Section 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 3.15, 3.16, 3.17;
Pay special attention on 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 3.16;
Compile and run the 19 examples in Chapter 3.

Solve the following Problems:
Problem (3-18): (p. 230);
Problem (3-21): (p. 231);
Problem (3-26): (p. 231).

Hint: (you don't have to follow this hint if you can solve these problems)

Exercise 3.18:

(1) Read Section 3.5 and 3.6.
(2) Run fig03_03.cpp and Run fig03_04.cpp.
(3) Understand what is a "FUNCTION" by modify fig03_03.cpp and fig03_04.cpp.
        for example, fig03_03.cpp, you may try a new function which returns y*y*y*y.
        for example, fig03_04.cpp, you may try a new function which returns a minimum.
(4) Then you may try to write a function which returns a power, such as
        int integerPower( int b, int e ) { . . . . . . }
(5) This integerPower function only needs a simple "for" structure. If you are not sure
        about your function, you need test it by running it.
(6) If you feel your function is correct, then, add the function prototype at the beginning
        of your program. always compare what you did with fig03_03.cpp and fig03_04.cpp.

(7) The main function needs only about 5 lines. You should know how to call the function you defined.
(8) The intergerPower function needs another 5 lines.

Exercise 3.21:

(1) Understand what is a "FUNCTION" by modify fig03_03.cpp and fig03_04.cpp.
        for example, fig03_03.cpp, you may try a new function which returns y*y*y*y.
        for example, fig03_04.cpp, you may try a new function which returns a minimum.
(2) The function you need to define here is as simple as this:
        bool even( int a )
        {   return !( a % 2 ); }
(3) If you don't understand the "bool" data type, you may use "if" statement, which
         returns an 1 if input number is even, or returns a 0 if the input number is odd.
(4) Use a if/else in your main function to do the output based on 1 or 0 returned form
        the function you designed.

Exercise 3.26:

(1) Read 3.16 on page 195.

(2) Study the following function definition.

unsigned seconds( unsigned h, unsigned m, unsigned s )

{ return 3600 * ( h >= 12 ? h - 12 : h ) + 60 * m + s; }

(3) If you don't understand the "Inline function", you may also try use if/else key words

to design a regular function. You do not have to use "inline function" here.

Exam-2 on Oct. 9 (covers Chapter 2 and 3).
Part (A): are based on Chapter 2. (page 140-156)
2.1 --- 2.15,
and 2.24, 2.25, 2.34, 2.39, 2.42, 2.52, 2.61.

Part (B): a few programs, for example:
(type 1) To calculate alternating harmonic series:
                                 sum = 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + 1/7 - 1/8 + 1/9 - 1/10 + 1/11.........
                                what is the sum if you uer 1M trems? if you sum infinit terms what should be the limit of the series?
                                 how many terms do you need to get a aum which only have +/- 0.000001error from the limit?.
(type 2) give you a function; your job is to use this function to solve a problem
(type 3) write a function first, and then finish the program, for example, your function can reverse any two digit number,
                   let the user input 5 two digit numbers, each calls the function. So that, your output will be 5 numbers the
                   user inputted, but reversed, say, if user input 34, the output will be 43, etc.

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