question

Discussion in 'C++' started by ar30067@gmail.com, Mar 11, 2007.

  1. Guest

    The 36 possible outcomes of rolling two dice.




    7.18 What does the following program do?

    1 // Ex. 7.18: Ex07_18.cpp
    2 // What does this program do?
    3 #include <iostream>
    4 using std::cout;
    5 using std::endl;
    6
    7 int whatIsThis( int [], int ); // function prototype
    8
    9 int main()
    10 {
    11 const int arraySize = 10;
    12 int a[ arraySize ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    13
    14 int result = whatIsThis( a, arraySize );
    15
    16 cout << "Result is " << result << endl;
    17 return 0; // indicates successful termination
    18 } // end main
    19
    20 // What does this function do?
    21 int whatIsThis( int b[], int size )
    22 {
    23 if ( size == 1 ) // base case
    24 return b[ 0 ];
    25 else // recursive step
    26 return b[ size - 1 ] + whatIsThis( b, size - 1 );
    27 } // end function whatIsThis



    7.19 Modify the program of Fig. 6.11 to play 1000 games of craps. The
    program should keep track of the statistics and answer the following
    questions:


    --------------------------------------------------------------------------------

    [Page 394]
    How many games are won on the 1st roll, 2nd roll, ..., 20th roll, and
    after the 20th roll?

    How many games are lost on the 1st roll, 2nd roll, ..., 20th roll, and
    after the 20th roll?

    What are the chances of winning at craps? [ Note: You should discover
    that craps is one of the fairest casino games. What do you suppose
    this means?]

    What is the average length of a game of craps?

    Do the chances of winning improve with the length of the game?

    7.20 ( Airline Reservations System) A small airline has just purchased
    a computer for its new automated reservations system. You have been
    asked to program the new system. You are to write a program to assign
    seats on each flight of the airline's only plane (capacity: 10 seats).

    Your program should display the following menu of alternativesPlease
    type 1 for "First Class" and Please type 2 for "Economy". If the
    person types 1, your program should assign a seat in the first class
    section (seats 1-5). If the person types 2, your program should assign
    a seat in the economy section (seats 6-10). Your program should print
    a boarding pass indicating the person's seat number and whether it is
    in the first class or economy section of the plane.

    Use a one-dimensional array to represent the seating chart of the
    plane. Initialize all the elements of the array to 0 to indicate that
    all seats are empty. As each seat is assigned, set the corresponding
    elements of the array to 1 to indicate that the seat is no longer
    available.

    Your program should, of course, never assign a seat that has already
    been assigned. When the first class section is full, your program
    should ask the person if it is acceptable to be placed in the economy
    section (and vice versa). If yes, then make the appropriate seat
    assignment. If no, then print the message "Next flight leaves in 3
    hours".

    7.21 What does the following program do?

    1 // Ex. 7.21: Ex07_21.cpp
    2 // What does this program do?
    3 #include <iostream>
    4 using std::cout;
    5 using std::endl;
    6
    7 void someFunction( int [], int, int ); // function prototype
    8
    9 int main()
    10 {
    11 const int arraySize = 10;
    12 int a[ arraySize ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    13
    14 cout << "The values in the array are:" << endl;
    15 someFunction( a, 0, arraySize );
    16 cout << endl;
    17 return 0; // indicates successful termination
    18 } // end main
    19
    20 // What does this function do?
    21 void someFunction( int b[], int current, int size )
    22 {
    23 if ( current < size )
    24 {
    25 someFunction( b, current + 1, size );
    26 cout << b[ current ] << " ";
    27 } // end if
    28 } // end function someFunction




    --------------------------------------------------------------------------------

    [Page 395]
    7.22 Use a two-dimensional array to solve the following problem. A
    company has four salespeople (1 to 4) who sell five different products
    (1 to 5). Once a day, each salesperson passes in a slip for each
    different type of product sold. Each slip contains the following:

    The salesperson number

    The product number

    The total dollar value of that product sold that day

    Thus, each salesperson passes in between 0 and 5 sales slips per day.
    Assume that the information from all of the slips for last month is
    available. Write a program that will read all this information for
    last month's sales and summarize the total sales by salesperson by
    product. All totals should be stored in the two-dimensional array
    sales. After processing all the information for last month, print the
    results in tabular format with each of the columns representing a
    particular salesperson and each of the rows representing a particular
    product. Cross total each row to get the total sales of each product
    for last month; cross total each column to get the total sales by
    salesperson for last month. Your tabular printout should include these
    cross totals to the right of the totaled rows and to the bottom of the
    totaled columns.

    7.23 ( Turtle Graphics ) The Logo language, which is popular among
    elementary school children, made the concept of turtle graphics
    famous. Imagine a mechanical turtle that walks around the room under
    the control of a C++ program. The turtle holds a pen in one of two
    positions, up or down. While the pen is down, the turtle traces out
    shapes as it moves; while the pen is up, the turtle moves about freely
    without writing anything. In this problem, you will simulate the
    operation of the turtle and create a computerized sketchpad as well.

    Use a 20-by-20 array floor that is initialized to zeros. Read commands
    from an array that contains them. Keep track of the current position
    of the turtle at all times and whether the pen is currently up or
    down. Assume that the turtle always starts at position (0, 0) of the
    floor with its pen up. The set of turtle commands your program must
    process are shown in Fig. 7.33.

    Figure 7.33. Turtle graphics commands.
    (This item is displayed on page 396 in the print version) Command
    Meaning

    1
    Pen up

    2
    Pen down

    3
    Turn right

    4
    Turn left

    5,10
    Move forward 10 spaces (or a number other than 10)

    6
    Print the 20-by-20 array

    9
    End of data (sentinel)
    , Mar 11, 2007
    #1
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  2. On 2007-03-11 11:29, wrote:
    > The 36 possible outcomes of rolling two dice.


    There are alwyas people out there looking for good exercises so it was
    kind of you to post some here, but it might be more useful if you could
    post a solution too.

    --
    Erik Wikström
    =?ISO-8859-1?Q?Erik_Wikstr=F6m?=, Mar 11, 2007
    #2
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  3. Default User Guest

    wrote:


    [long problem set]


    The answer is, "do your own homework". This applies equally whether
    those were assigned to you in a class or you assigned them to yourself.
    You only learn programming by doing. Reading solutions posted here will
    help you very little.

    Take those one at a time, work on them, post your solution. Follow the
    FAQ instructions on how to post. Then you will learn.




    Brian
    Default User, Mar 11, 2007
    #3
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