Chapter 4, Problem 4.13E

For Exercises 4.13—4.16, perform each of these steps:
  a) Read the problem statement.
  b) Formulate the algorithm using pseudocode and top-down, stepwise refinement.
  c) Write a C++ program,
  d)Test, debug and execute the C++ program.
4.13(Gas Mileage) Drivers are concerned with the mileage obtained by their automobiles. Onedriver has kept track of several trips by recording miles driven and gallons used for each trip. Develop a C++ program that uses a while statement to input the miles driven and gallons used for each trip. The program should calculate and display the miles per gallon obtained for each trip and print the combined miles per gallon obtained for all tankfuls up to this point.

Enter wiles driven (-1 to quit): 287

Enter gallons used: 13

MPG this trip: 22.076923

Total MPC: 22.076923

Enter wiles driven (-1 to quit): 200

Enter gallons used: 10

MPC this trip: 20.000000

Total MPC:21.173913

Enter the miles driven (-1 to quit): 120
Enter gallons used: 5
MPC this trip: 24.000000
Total MPC: 21.678571

Enter the miles used (-1 to quit): -1

4.14 (Credit Limit?) Develop a C++ program that will determine whether a department-store customer has exceeded the credit limit on a charge account. For each customer, the following facts are available:

1. Account number (an integer)
2. Balance at the beginning of the month
3. Total of all items charged by this customer this month
4. Total of all credits applied to this customer's account this month
5. Allowed credit limit

The program should use a whilestatement to input each of these facts, calculate the new balance (= beginning balance + charges - credits) and determine whether the new balance exceeds the customer’s credit limit. For those customers whose credit limit is exceeded, the program should display the customer’s account number, credit limit, new balance and the message “Credit Limit Exceeded.”

Enter account number (or -1 to quit): 100 Enter beginning balance: 5394.78 Enter total charges: 1000.00 Enter total credits: 500.00 Enter credit limit: 5500.00 New balance is 5894.78 Account: 100 Credit limit: 5500.00 Balance: 5894.78 Credit Limit Exceeded.

Enter Account Number (or -1 to quit): 200
Enter beginning balance: 1000.00
Enter total charges: 123.45
Enter total credits: 321.00
Enter credit limit: 1500.00
New balance is 802.45

Enter Account Number (or -1 to quit): -1

4.15 (Sales-Commission Calculator) A large company pays its salespeople on a commission basis. The salespeople each receive $200 per week plus 9% of their gross sales for that week. For example, a salesperson who sells $5000 worth of chemicals in a week receives $200 plus 9% of $5000, or a total of $650. Develop a C++ program that uses a while statement to input each salesperson’s gross sales for last week and calculates and displays that salesperson’s earnings. Process one salesperson’s figures at a time.

Enter sales in dollars (-1 to end): 5000.00

Salary is: $650.00

Enter sales in dollars (-1 to end): 6000.00

Salary is: $740.00

Enter sales in dollars (-1 to end): 7000.00

Salary is: $830.00

Enter sales in dollars (-1 to end): -1

4.16(Salary Calculator) Develop a C++ program that uses a while statement to determine the gross pay for each of several employees. The company pays “straight time” for the first 40 hours worked by each employee and pays “time-and-a-half’ for all hours worked in excess of 40 hours. You are given a list of the employees of the company, the number of hours each employee worked last week and the hourly rate of each employee. Your program should input this information for each employee and should determine and display the employee’s gross pay.

Enter hours worked (- 1 to end): 39 Enter hourly rate of the employee ($00.00): 10.00 Salary is $390.00

Enter hours worked (-1 to end): 40
Enter hourly rate of the employee ($00.00): 10.00
Salary is $400.00

Enter hours worked (-1 to end): 41
Enter hourly rale of the employee ($00.00): 10.00
Salary is $415.00

Enter hours worked (-1 to end): -1