CISC106 Fall 2006 Lab06

• Write a program or webpage for each of the following problems. Be sure to save every separate program. All programs must be properly commented and indented (see Assignment Standards on the class website).
  
  
• Work on the webpage during lab. It should go very quickly and you will want your TA there in case you have a question. You may work with other students if you have trouble getting your webpage to appear, but as usual, all your other programming must be done by yourself.
  
  
• Name each program lab06.n.c, where n is the number in the list below. For example, the name of the file for the first will be lab06.1.c. Put the files in your lab06 directory.
  
  

Programs

1. See makeWebpage.html for the first part of this lab. Look up the chmod command from part 1 in your Anderson. Can't find it? Look for "mode" in the index. Explain what a+rx means, in a text file or on your script.
   
   
2. Copy lab03.3 into this lab directory and rename it appropriately. Compile it using the "-o" option so that the executable file is named "threes" instead of "a.out". Test to see that it still works.
   Place the multiples generated by your program into a data file called threes.txt. To do this, use the Unix redirection operator > like this:

   threes > threes.txt
   
   

   Now you will read them into two separate arrays. Make two integer arrays of size 25. Start a loop reading the elements from the data file. As each element is read, print it out.
   Next, still inside the read loop, use mod so that elements numbered 0, 2, 4 etc. go into the first array, while elements numbered 1, 3, 5 etc go into the second array (Looking at the data, what would be good names for the arrays?).
   After all the data is read, print the arrays separately.
   
   
3. Modify the previous problem so that it writes the output to a file. Use fopen in "w" mode, fprintf and a loop to write the whole array to a new file output.txt. Then rename that file to
   ~/public_html/cisc105/lab06output.txt
   Use chmod to make it readable so your TA (and the world) can see it.
   
   
4. A character is represented by putting a symbol inside single quotes, so 'a' is of type char. Use characters in quotes the same way you would use an integer value, i.e. you can say

   char c = 's';
   
   

   Write a program with a char variable. Ask the user to type a char, read it into your variable as a single char, and print "Not a Q" or "That's a Q" depending on the input.
   
   
5. Write a program that reads a single char and loops as long as the user enters a 'q'. Inside the loop, print the character (using the format specifier %c) that the user entered. What odd behavior do you observe? Note this in your comments and say how you addressed it.