Test 3 (Autumn Repeat):
B.Eng. (Telecommunications Engineering)

General

This test is made up of two parts:

1. Reformatting and correcting a given program.

2. Modifying this corrected program in certain specified ways.

Note that marks will be awarded purely on the content of the final report. Therefore, at all stages of the test, please describe your plans, problems encountered, tests carried out and, when the required tasks have been completed, describe any conclusions drawn from the exercise.

Part 1 (60%)

The program PARLLEL.C is supposed to calculate the equivalent resistance of a set of separate resistors , , etc. connected in parallel, according to the following equation:

The program is currently poorly laid out and formatted, and has various other defects. You are required to:

• Present a reformatted version of the program which demonstrates satisfactory practice for spacing, line breaking and indentation. Add further comments if appropriate.

• Correct any errors or defects manifested at translation time (i.e. during compilation and/or linkage). In the case of warnings, either resolve them or explain why they can be safely ignored.

• Correct any defects manifested at run time. Ensure that you test the program severely in an effort to reveal any remaining defects.

Part 2 (40%)

Modify the program PARLLEL.C (as corrected in part 1) as follows:

• Separate the code for calculating the equivalent resistance into a function of its own, suitably invoked by main().

• The original program prompts for just one "data set" (consisting of the number of resistors, and their individual values) and then carries out the calculation of equivalent resistance for that one data set. Modify the program so that it repeatedly prompts for additional data sets, calculating and displaying equivalent resistance for each data set. This should continue until the value zero is entered as the number of resistors. The program should then terminate.

Correct any defects manifested in your modified program. Ensure that you test the program severely in an effort to reveal any remaining run time defects.