Internet (Computer Sciences)

Control Structures: IF, IF-ELSE, and WHILE

1. Read the below problem statement. Formulate an algorithm using pseudo-code and top-down, stepwise refinement. Write a Java program. Test, debug and execute the Java program.

Drivers are concerned with the mileage their automobiles get. One driver has kept track of several trips by recording the miles driven and gallons used for each tankful. Develop a Java application that will input the miles driven and gallons used (both as integers) 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 trips up to this point. All averaging calculations should produce floating-point results. Use class Scanner and sentinel-controlled repetition to obtain the data from the user.

2. Write a program that displays a table of the Celsius temperatures 0 through 20 and their Fahrenheit equivalents. The formula for converting a temperature from Celsius to Fahrenheit is:

where F is the Fahrenheit temperature and C is the Celsius temperature. Your program must use a while loop to display the table.

3. Write a Java application that uses a while loop to print the following table of values:

4. Read the below problem statement. Formulate an algorithm using pseudo-code and top-down, stepwise refinement. Write a Java program. Test, debug and execute the Java program.

A large company pays its salespeople on a commission basis. The salespeople receive $200 per week plus 9% of their gross sales for that week. For example, a salesperson who sells $5,000 worth of merchandise in a week receives $200 plus 9% of $5000, or a total of $650. You’ve been supplied with a list of the items sold by each salesperson. The values of these items are as follows:

Develop a Java application that inputs one salesperson’s items sold for last week and calculates and displays that salesperson’s earnings. There’s no limit to the number of items that can be sold.

5. The process of finding the largest value is used frequently in computer applications. For example, a program that determines the winner of a sales contest would input the number of units sold by each salesperson. The salesperson who sells the most units wins the contest. Write a program using a while loop that lets the user enter a series of integers. The user should enter – 99 to signal the end of the series. After all the numbers have been entered, the program should display the largest of the numbers entered.

6. (Find the Two Largest Numbers) Using an approach similar to that for Question 5, find the two largest values of 10 values entered. [Note: You may input each number only once.]

Introduction to Computer Programming LAB – 4

Control Structures: FOR, DO-WHILE, and Nested Loops

1. Write an application that calculates the product of the odd integers from 1 to 15. Use a for

2. Write a program that uses a for loop to print the following table of values:

3. Write a program that asks the user for a positive integer and displays a square on the screen using the character ‘X’. The number entered by the user will be the length of each side of the square. For example, if the user enters 5, the program should display the following:

4. Modify the compound-interest application of Fig. 4.6 (see next page) to repeat its steps for interest rates of 5%, 6%, 7%, 8%, 9% and 10%. Use a for loop to vary the interest rate.

5. Write a program that uses nested loops to collect data and calculate the average rainfall over a period of years. First the program should ask for the number of years. The outer loop will iterate once for each year. The inner loop will iterate 12 times, once for each month. Each iteration of the inner loop will ask the user for the inches of rainfall for that month. After all iterations, the program should display the number of months, the total inches of rainfall, and the average rainfall per month for the entire period. Use for

Input Validation: Do not accept a number less than 1 for the number of years. Do not accept negative numbers for the monthly rainfall. Use a do-while loop for input validation.

6. Write an application that displays the following patterns separately, one below the other. Use for loops to generate the patterns.