Rev B Lab4

1) Which of the following are illegal identifier names, and why?

a) hello

b) int

c) good-bye

d) why_dont_you_continue

e) 1outOfFive

f) payRate

g) x

h) gr8

i) hi!

2) What is printed by the following program?

#include<iostream>

using namespace std;

int main()

{

cout << "$$$" << '\t' << "&&&" << '\n';

cout << endl << endl << endl;

cout <<'$'<<" * " << '\n';

cout <<'a'<<'t';

cout <<"good-bye!";

return 0;

}

3) Evaluate the following expressions:

a) 6 + 8 % 3

b) (7 – 15) + 62 – 4 / 3

c) 22.4 / 4 – 6.3 * 2

d) 15.46/2

e) 14/3-3%2

f) 14/3%3

Be sure to include comments at the beginning of the program with your name, date etc, and comments throughout the program to explain your code. Use const whenever appropriate.

4) Write a program to compute and print the cost of airline tickets from Boston to New York.

Your program prompts the user to input a ticket price.

Your program prompts the user to input the number of tickets to be bought.

Due to a membership in travel clubs you will receive a 13% discount.

There is 8.75% tax on the price of the tickets plus a airport charge of $15.

Your program should print out the total amount due in the following format (you may use spaces or the tab for the white space, which does not have to be a specific number of spaces), with the following input.

# of tickets: 5 @ $178.00

subtotal: <subtotal here>

amount of discount: <amount of discount>

total without tax: <total without tax>

tax: <tax>

airport charge: $15

total due: <total due>

Run your program on two more sets of input:

6 tickets at $150 each

10 tickets at $105.60 each

Print and submit all source code and 3 printouts of output

5) If x=5, y=6, z=4 and w=3.5evaluate each of the following statements, if possible. If not possible, state the reason.

a) (x+z)%y=

b) (x+y)%w=

c) (y+w)%x=

d) (x+y)*w=

e) (x5y)%z=

f) (y%z)%x=

g) (x*z)%y=

h) ((x*y*w)*z=

6) Write the following as a C++ expression.

(-b+(b²-4ac))/2a=

7) What is the output of the following statements? Suppose a and b are int variables, c is a double variable, and a =13, b=5, and c=17.5.

a) cout<<a/static_cast <double>( b )+2*c<<endl;

b) cout<< static_cast <int>( c )%5+a-b<<endl;

8) Malik, any edition, chapter 2, problem 24

SOLUTIONS

4)

/*Lab4 exercise4 Computes and prints cost of airline tickets*/

#include <iostream>

#include <iomanip>

using namespace std;

const double Discount=0.13;

const double Tax=0.0875;

const double AirportCharge=15.00;

int main()

{

double numberTickets,ticketPrice,subtotal;

cout<<"number of tickets purchased ";

cin>>numberTickets;

cout<<endl;

cout<<"ticket price $";

cin>>ticketPrice;

cout<<endl<<endl;

cout<<fixed<<showpoint<<setprecision(2);

cout<<"# of tickets:" <<'\t'<<numberTickets<<'\t'<<"@"<<'\t'<<'$'

<<ticketPrice<<endl<<endl;

subtotal=numberTickets*ticketPrice;

cout<<"subtotal"<<'\t'<<'$'<<subtotal<<endl;

double discountAmount=Discount*subtotal;

cout<<"amount of discount"<<'\t'<<'$'<<discountAmount<<endl;

double totalBeforeTax=subtotal-discountAmount;

cout<<"total without tax"<<'\t'<<'$'<<totalBeforeTax<<endl;

double tax=Tax*totalBeforeTax;

cout<<"tax:"<<tax<<endl;

cout<<"airport charge"<<'\t'<<'$'<<AirportCharge<<endl;

cout<<"total due"<<'\t'<<'$'<<totalBeforeTax-tax-AirportCharge<<endl;

return(0);

}