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School of Engineering
Computing for Engineers – Assessed Lab 1 (2 hours)
09-10 November 2020 (Week 7 Semester 1)
This is an assessed lab exercise.
Statement of good academic conduct
By submitting this assignment, I understand that I am agreeing to the following statement of
good academic conduct.
I confirm that this assignment is my own work and I have not worked with others in
answering the exercises in this assignment.
I confirm that I have not asked, or paid, others to undertake any part of this work for me.
I confirm that I have read and understood the University regulations on plagiarism
https://intranet.birmingham.ac.uk/as/registry/policy/conduct/plagiarism/index.aspx.
I understand that if concerns are raised about my work I may need to participate in a viva
(oral examination) of my work. I also understand that my progress and/or graduation may be
delayed whilst these concerns are investigated under the Code of Practice on Academic
Integrity or Code of Practice on Plagiarism.
Your C Source code for Exercise A and Exercise B must be uploaded to Canvas by
Tuesday 10 November, 23:59 UK Time
Your code must be uploaded as a .c or .cpp file (C Source file).
In most cases you will need to upload the two files called “main.c” (one for each exercise).
Do not upload .docx files, .pdf or any other format.
Do not email the code to the course lecturer or to any other member of staff or PGTA.
Only Canvas submissions will be marked.
If you have any problems uploading your code, consult the Module Lecturer at least 12
hours before the above deadline. Once the deadline has expired, your mark for the
Assessment will be deducted 5 marks per day or part of a day.
The Module Lecturer cannot extend any deadlines for this assignment for any reason. If you
wish to be considered for an extension, you will need to apply for Extenuating Circumstances
via Engineering Welfare.
Assessed lab exercises
A. A chemical solution contains a mixture of Hydrogen ions and Hydroxide ions.
The acidity of a chemical solution (referred to as “PH”) is dependent on the concentration of
Hydrogen ions m and can be expressed as:
PH =  log10 (m)
where log10 is the logarithm to base 10 (note the negative sign in front of the log10). The
alkalinity of the same solution (referred to as “POH”) can be expressed as:
POH =  log10(
1
𝑚×1014)
Again note the negative sign in front of the log10.
Write a program to enter m from the user in exponential notation.
 The program should display the acidity and alkalinity in decimal notation.
 If m is greater than 1.000 or m is less than 10-14, then the acidity and alkalinity should
not be calculated, and an error message should be displayed.
 The program should print out the acidity and alkalinity. Your program should also
print out the sum of the acidity and alkalinity, as a check this should always be equal
to 14.0000.
 The program should also display the following output depending on the value of PH
0 to 6.9 "Acid”
6.9 to 7.1 “Neutral”
7.1 to 14 “Alkaline”
 When using scanf, credit will only be given for using the correct ANSI C input
formats as defined in the Study Guide.
Hint:
 Use the “log10” library function to work out logarithms to base 10.
B. Steel bolts are being measured for quality control purposes. The bolts have a nominal
length of 50mm and diameter of 12mm.
The user of the program enters the required tolerance in mm, and then the user enters the
actual lengths and diameters of a number of bolts which have been measured for quality
control purposes.
The user enters any negative number to terminate the input.
For example, if a tolerance of 2.5mm is entered, that means the length of each bolt must be
within (or equal to) the range 47.5mm to 52.5mm, and the diameter must be within (or equal
to) the range 9.5mm to 14.5mm. These bolts are “Within Tolerance”. If either the length or
diameter is outside these ranges, then the bolt is “Not within Tolerance”.
The program should then display:
 The number of bolts which were “Within Tolerance”
 The percentage of bolts which were “Within Tolerance”
 The average length and the average diameter of all bolts (excluding bolts with any
negative values)
Enter the tolerance
2.5
Enter bolt length/diameter values (enter negative numbers to exit)
52 11
Within tolerance
50 12
Within tolerance
50 12
Within tolerance
53 11
Not within tolerance
52 14
Within tolerance
50 13
Within tolerance
-1 -1
5 bolts were within tolerance
Percentage of bolts within tolerance = 83.333333
Average length of bolt = 51.166667
Average diameter of bolt = 12.166667
END OF THE ASSESSMENT

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