COMP281 202**4 – Resit Exercise (29/July 2024) 
 
• In the following, you will find the two problems that constitute the resit exercise. The problems will 
also appear on the canvas site for COMP281 as “Resit Assignment”. 
 
• For each problem you need to write a C program (not C++ or C#) that solves the problem – it must 
read the input, as specified in the problem description then print the solution to the given problem for 
that input. 
o Note that code is “correct” only if it correctly implements a solution to the problem stated 
in the assignment, not "if CodeGrade accepts it". 
o That is, even if CodeGrade accepts your code, it could be wrong. Read the problem carefully. 
o Even if your program does not work, good coding style etc. can still lead to a reasonable mark. 
 
• Input is read from the standard input, in the same way that you read input from the keyboard as shown 
in lectures (e.g., using scanf). Output is also printed to the standard output, as you have seen (e.g., 
using printf). 
 
• You may develop your programs in CodeGrade directly, or by using a different development 
environment. When you are satisfied that your C programs work correctly, you must make sure you 
submit them through CodeGrade. Do not leave this until the last possible minute. Test with CodeGrade 
well before the assignment deadline. 
o Even if the programs are not correct, still submit whatever you have! You can still earn points 
if certain parts of the code are programmed well. 
 
• This assignment is worth 100% of the resit mark for COMP281. 
o For problem one, you can earn a total of 25 points 
§ 12 points for “Functionality and Correctness” awarded for programs that correctly 
solve the problem for all test cases. 
§ 13 points for “Programming style, use of comments, indentation and identifiers” 
awarded depending on the style, comments and efficiency of the solution. 
o For problem two, you can earn a total of 75 points 
§ 35 points for “Functionality and Correctness” awarded for programs that correctly 
solve the problem for all test cases. 
§ 40 points for “Programming style, use of comments, indentation and identifiers” 
awarded depending on the style, comments and efficiency of the solution. 
 
o The final grade results from normalising the earned points to a scale of 100. 
 
• Any resources that you use to help you develop the programs must be referenced in comments in the 
code (e.g. use of Stack Overflow etc.). Do not use ChatGPT or other Generative AI tools to write your 
code. Submission Instructions 
• Please make sure that you have correctly submitted your final version through CodeGrade and that 
your solutions are named correctly. Check the required names for your solutions below in the sections 
for each of the two problems. Solutions that work, but which don’t compile and run in CodeGrade due 
to having the wrong names will be marked as though they did not work. 
• The deadline for this resit assignment submission is Friday 2th August 2024 @ 23:59 
• Penalties for late submission apply in accordance with departmental policy as set out in the student 
handbook, which can be found at: http://intranet.csc.liv.ac.uk/student/ug-handbook.pdf 
 Problem 1 
Title: String Concatenation 
Description 
Write a program called resit_1.c that reads in two input strings, one per line, each of max length 100 
characters. These two strings should then be concatenated together with a space character between 
them and the resulting single string stored in memory in a char array whose size is exactly big enough 
to hold it all. This final char array must be created using malloc/alloc etc. The resulting string should 
then be printed out, with an additional newline at the end. 
Note the only library you can use is the standard IO library, stdio.h. You must not use the string handling 
functions in string.h. All string operations (string length, concatenation etc) must be provided by your own 
code. 
Input 
Two strings (each of 100 characters at most), both on a separate line (i.e. a newline is entered after the first 
string). 
Output 
The concatenated version of the two strings. 
Sample Input 
What is the weather like? 
It’s quite cold and wet for the time of year. 
 
Sample Output 
What is the weather like? It’s quite cold and wet for the 
time of year. 
 
 
 Problem 2 
Title: Numbers into Words 
Description 
Write a program called resit_2.c that reads in an integer and outputs it, along with a textual version 
of it in English. This process should repeat with another input integer until EOF is detected by your 
program. Every input integer is guaranteed to be between 1 and 8 digits. CodeGrade will not supply 
any data outside of this range. 
To discover the rules for formatting the output, a web app has been made available (see link below). Using 
this app you can enter integers that will be processed and output using the rules that you will need to follow. 
Use the app to discover the rules for yourself. 
 
If the app does not run on your browser, try restarting your browser, or use a different browser. 
 
https://cgi.csc.liv.ac.uk/~phil/COMP281/ 
 
Input 
An integer. 
Output 
The input integer, followed by an “arrow” and then a series of English words representing that integer. 
 
Sample Input 
10 
 
Sample Output 
10 => Ten 
 
Note 
If you wish to do so. you can use functions in the stdlib and stdio libraries. No other libraries (or header 
files) are permitted. 
 
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