[Solved] COMP1400 Lab1-UNIX Exercise

Both Cygwin (on PC) and Ubuntu (on CS system) are essentially variants of UNIX. While a list of common UNIX commands and control sequences is provided at the end of this file, the following shows a couple of examples for the use of ls command. The base directory is

/cygdrive/c in Cygwin for the C: drive on PC or /home/your user name in Ubuntu, where user name is your user name for login. The following line of command allows you to see the directories and files in the base directory, in which base dir needs to be replaced by either /cygdrive/c or /home/your user name depending on the system you are using.

$ ls base dir

If you have a directory named Program Files in the base directory, the following command lists the files under this directory.

$ ls base dir/Program Files

Accomplish the following tasks, and submit your list of commands for the sequence of tasks.

1. Start a Cygwin terminal (on PC) or Ubuntu terminal (lab machine).
2. At the terminal prompt $, create a fall16 directory in the base directory.
3. In a similar manner, create a cs140 directory in the newly created fall16
4. Change your working directory by going to the /base dir/fall16/cs140
5. Check the name of your current working directory.
6. List all the files of the current directory, including hidden dot files.
7. Take one or more (if one is not enough) screenshots, and submit them as your solution to this exercise.
8. RAPTOR Exercise:
   1. Start RAPTOR and create a flowchart to swap two integer numbers entered by the user and display the numbers before and after swapping.
   2. Run the flowchart with different numbers .
   3. Save the flowchart to a file named rap in the working directory on the PC you are using.
   4. Demonstrate the rap file to GA/TAs and run with different input values. Hint: For swapping two numbers you need a temporary variable.
9. Basic C Programming Exercise Accomplish the following tasks.
   1. Start a text editor, which could be gedit on a Ubuntu machine or Notepad++ on PC.
   2. Type in the program in Section 2.1 on page 10 of the textbook with a modification to change the printf statement to the following, where my name needs to be replaced by your full name.

printf(Good morning!nMy name is my name.n);

1. Save the file in the format of a C source file as modified pun.c in your working directory,

i.e., /home/your user name/fall16/cs140.

1. As you are already in the working directory as completing UNIX Exercise, you can now compile the C program with the following command to produce an executable.

$ gcc -Wall modified pun.c -o my prog

1. Run the executable with the following command to produce the output.

$ ./my prog

4. Algorithm implementation with C programming:
   1. Implement the algorithm as represented by rap that you have already created in this lab, and write an equivalent C program that accomplishes what the flowchart does, with the assumption that the input numbers are always integer. You can use scanf to get the values entered by the user. A sample output is shown below:

Enter the first number: 5

Enter the second number: 10

Before swapping, the first number was 5 and the second number was 10.

After swapping, the first number is 10 and the second number is 5.

1. Save your program to a file named c, in the working directory on the PC you are using.
2. Demonstrate the c file to GA/TAs and run with different input values.

NOTE: Files saved on the PCs in the lab are not be permanent. They must be either saved to a USB drive, or transferred to Ubuntu.

COMMON COMMAND AND CONTROL SEQUENCES The following commands can be entered at the UNIX system command prompt. Press the Return key after each command. Use lower case letters unless otherwise indicated.