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Microsoft Visual C#

Microsoft Visual C#

7th Edition

ISBN:9781337102100

Author:Joyce, Farrell.

Publisher:Joyce, Farrell.

Chapter5: Looping

Section: Chapter Questions

Problem 7RQ

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Write a do … while loop that outputs the word “alarm” (without the double quotes) 3 times.

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The body of a while loop can consist of ____________. a. a single statement b. a block of statements within curly braces c. either a or b d. neither a nor b
(For review) a. What’s the difference between a pretest and posttest loop? b. If the condition being tested in a pretest loop is false, how many times are statements in the loop executed? c. If the condition being tested in a posttest loop is false, how many times are statements in the loop executed?
(Misc. application) Four experiments are performed, and each experiment has six test results. The results for each experiment are given in the following list. Write a program using a nested loop to compute and display the average of the test results for each experiment. 1stexperimentresults:23.23116.92725.428.62ndexperimentresults:34.845.227.936.833.439.43rdexperimentresults:19.416.810.220.818.913.44thexperimentresults:36.93949.245.142.750.6
(cin within a loop) Write and run a C++ program that accepts 10 values of gallons, one at a time, and converts each value entered to its liter equivalent before the next value is requested. Use a for loop in your program. Use the fact that 1gallon=3.785liters.
(Electrical eng.) a. An electrical manufacturer tests five generators by measuring their output voltages at three different times. Write a C++ program that uses a nested loop to enter each generator’s test results, and then computes and displays the average voltage for each generator. Assume the following generator test results: 1stgenerator:122.5122.7123.02ndgenerator:120.2127.0125.13rdgenerator:121.7124.9126.04thgenerator:122.9123.8126.75thgenerator:121.5124.7122.6 b. Modify the program written for Exercise 3a to calculate and display the average voltage for all the generators. (Hint: Use a second variable to store the total of all the generator’s voltages.)
(Numerical analysis) a. The following is an approximate conversion formula for converting Fahrenheit to Celsius temperatures: Celsius=(Fahrenheit30)/2 Using this formula, and starting with a Fahrenheit temperature of 0 degrees, write a C++ program that determines when the approximate equivalent Celsius temperature differs from the exact equivalent value by more than 4 degrees. (Hint: Use a while loop that terminates when the difference between approximate and exact Celsius equivalents exceeds 4 degrees.) b. Using the approximate Celsius conversion formula given in Exercise 8a, write a C++ program that produces a table of Fahrenheit temperatures, exact Celsius equivalent temperatures, approximate Celsius equivalent temperatures, and the difference between the exact and approximate equivalent Celsius values. The table should begin at 0 degrees Fahrenheit, use 2-degree Fahrenheit increments, and terminate when the difference between exact and approximate values is more than 4 degrees.
Which of the following is not required of a loop control variable in a correctly working loop? It is reset to its initial value before the loop ends. It is initialized before the loop starts. It is tested. It is altered in the loop body.
(Misc. application) a. Write a program that continuously requests a grade to be entered. If the grade is less than 0 or greater than 100, your program should print an appropriate message informing the user that an invalid grade has been entered; else, the grade should be added to a total. When a grade of 999 is entered, the program should exit the repetition loop and compute and display the average of the valid grades entered. b. Run the program written in Exercise 2a and verify the program by using appropriate test data.

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