C Programming - Task Sheet

Introduction

Task 1

  1. Create a new folder called “CTasks1”
    • You can do this from the file manager, or from the terminal.
    • In the terminal
    • you can use ls to see the contents of the current folder
    • you can use cd to change directory - cd foldername
    • you can use mkdir to make a directory - mkdir CTasks1
  2. Open Visual Studio Code
    • You can do this from the Linux menu
    • Choose Open Folder from the menu and select your new folder * Or you can do this from terminal
    • you can use code to launch VSC
    • if you change to the directory you want to work in VSC will open using that folder
  3. Create a new file called HelloWorld.c
  4. Put the code below in the file
#include <stdio.h>

int main(void) {
  printf("Hello World\n");
  return 0;
}
  1. Compile and run the code
    • Right click on the file and select run
    • or
    • Select the terminal window (this can be opened from the View menu)
    • Enter gcc HelloWorld.c -o HelloWorld to compile the code to an executable called HelloWorld.
    • Enter ./HelloWorld to run the code

Task 2

  1. Create a new file in the CTasks1 folder called printfDemo.c
  2. Open this file in VSC
  3. Put the code below in the file
#include <stdio.h>

int main(void) {
  printf("Hello World\n");
  return 0;
}
  1. Experiment with adding copies of the printf line
    • place a \n in between Hello and World
    • place a \t in between Hello and World

Task 3

  1. Return to your printf_demo code
  2. Add the two lines of code
int iVal = 65;
printf("Variable 0 %d", iVal);
  1. What happens if you change the %d to %c?
  2. Add a float variable with float fVal=5.6;
  3. Output the new variable using printf.

Task 4

  1. Return to your printf_demo code
  2. Add these lines to your code
  3. float fVal = 3.14159265;
printf("float is %f\n", fVal);
printf("float is %.2f\n", fVal);

Do you get different output?

  1. Try adding a new line
printf("float is %6.2f\n", fVal);

What happens? Why?

Task 5

  1. Return to your printf_demo code
  2. Print out a receipt for the following items Bread £1.20, Milk 95p, Cheese £5, Butter £2.10.
  3. The price for each item should be stored in a float variable and printed from there.
  4. Calculate the sum of the items and store it in another variable
  5. The receipt should be headed “Recipt”, should print out each item and its price, each item on its own line
  6. The total should be printed from the variable as shown below
Receipt
-------
Bread  £1.20
Milk   £0.95
Cheese £5.00
Butter £2.10
       -----
Total  £9.25

Variables

Task 6

  1. Create a new file and call it variables_demo.c
  2. Create an enum called days for the days of the week. It should store the name of each day, numbered from 0.
  3. Create an enum variable called today.
  4. Create an integer array that stores 7 values {10,15,5,60,20,40,30}.
  5. Set today to Thursday.
  6. Output the value from the integer array for today.

Functions

Task 7

  1. Create a new file and call it functions_demo.c
  2. Write a function that returns the middle value of three integer parameters

Strings

Task 8

  1. Create a new file and call it strings_demo.c
  2. Demonstrate outputting the length of a string stored in a char array.
  3. Demonstrate copying one string to another
  4. Demonstrate concatenating one string to the end of another
  5. Demonstrate checking to see if two strings are the same
  6. Write code that reads in a string from the keyboard and outputs it to the screen.

Bringing it together

Task 9

  1. Create a new file and call it morse.c
  2. Write an application that reads in a string of text from the keyboard and converts it to morse code, outputting one the morse for each character on a separate line. The test should consist of only lower case characters and spaces.

Morse code on wikipedia