Solutions Manual – Design and Stop Exercises for C++ for Computer Science and Engineering, 4th Edition

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SOLUTIONS MANUAL

,Design and Stop Exercises Solutions 2

Chapter 1 — Design Exercises
1. How would you solve this problem? What is the answer? A bug wishes to climb to the top of a
12-foot tall telephone pole. During the day, it climbs 3 feet. However, while it sleeps at night, the
bug slides back down 2 feet. How many days does it take the bug to reach its objective, the top of
the pole?

Answer:
day Starts Day At Height Made that Day
1 0 3
2 1 4
3 2 5
4 3 6
5 4 7
6 5 8
7 6 9
8 7 10
9 8 11
10 9 12 — done he’s at the top


2. Sketch a solution in pseudocode or English to solve this problem. A math teacher wishes to
have a program that displays the multiplication tables for her fourth graders. She wants the
program to accept any whole number (integer) from 1 to 9. The program then displays the
multiplication tables from 1 to that number. A sample run might be as follows. Note she enters
the underlined number 4.
Enter a number from 1 to 9: 4
1 x 1 = 1 x 1 = 1
1 x 2 = 2 x 1 = 2
1 x 3 = 3 x 1 = 3
1 x 4 = 4 x 1 = 4
2 x 2 = 2 x 2 = 4
2 x 3 = 3 x 2 = 6
2 x 4 = 4 x 2 = 8
3 x 3 = 3 x 3 = 9
3 x 4 = 4 x 3 = 12
4 x 4 = 4 x 4 = 16

A Solution:
display “Enter a number from 1 to 9: “
input endnumber
let startnumber = 1
do the following while startnumber is less than or equal to endnumber
let currentnumber = startnumber

,Design and Stop Exercises Solutions 3

do the following while currentnumber is less than or equal to endnumber
display startnumber, ‘x’, currentnumber, ‘=’, currentnumber, ‘x’,
startnumber, ‘=’ currentnumber times startnumber
add 1 to currentnumber
end do
add one to startnumber
end do

main storage: startnumber endnumber currentnumber


3. Sketch a solution in pseudocode or English to solve this problem. A manager of some carpet
store wishes a program that calculates the square footage of carpet a customer requires and
determines his cost for installation based on the square footage. The program first asks him to
enter the length and width of the room. It then displays the square-footage. His installation cost is
found by multiplying the square footage by 7.5%. A test run might be:
Enter the length and width of the carpet: 10 20
The square footage is 200 and the service charge is $15.00

solution:
display “Enter the length and width of the carpet: “
input length and width
sqFootage = length times width
serviceCharge = sqFootage times .075
display “The square footage is “, sqFootage,
“ and the service charge is $”, serviceCharge

main storage: length width sqFootage serviceCharge

, Design and Stop Exercises Solutions 4

Chapter 1 — Stop! Do These Exercises Before Programming
Correct the errors in the following programs. If you are having trouble determining what is
wrong, you can always make a test program, enter this coding and see what the compiler
indicates is wrong.

1. Why does this program not compile? Show what must be done to fix it?
int main () {
cout << "Hi there!\n";
return 0;
}
#include <iostream>
#include <iomanip>

solution: header includes must come first and needs the using namespace statement
#include <iostream>
#include <iomanip>
using namespace std;
int main () {
cout << "Hi there!\n";
return 0;
}


2. Why does this program not compile? Show what must be done to fix it?
#include <iostream>
#include <iomanip>
Int Main () {
Cout << "Great day outside!!\n";
return 0;
}

solution: you must watch the case of items and using namespace
#include <iostream>
#include <iomanip>
using namespace std;
int main () {
cout << "Great day outside!!\n";
return 0;
}


3. Why does this program not compile? Show what must be done to fix it?
#include <iostream>
#include <iomanip>