CISC105 Fall 2006 Lab04

• Write a program 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).
  
  
• CODE! If you are having difficulty writing programs, consider programming more often. Working on C every day makes a big difference, and leaving it alone, even just for a weekend, can result in backsliding. You are learning a language and a way of thinking.
  
  
• Every function gets commented with a brief description. Discuss this with your TA to learn what is appropriate.
  
  
• Name each program lab04.n.c, where n is the number in the list below. For example, the name of the file for the first will be lab04.1.c. Put the files in your lab04 directory.
  
  

Programs

1. Write a function that computes and prints the value of a number raised to an exponent. It will take two parameters (the double base number and the integer exponent) and use a loop to raise the number to the appropriate power. Call the function from main(). Test appropriately.
   
   
2. Put the function call from problem 1 inside a loop so that the user can calculate as many exponentiations as they want. Design the loop to halt when the user enters a sentinel exponent of -1.
   
   
3. Write a function called indent. It will be a void function and takes a single integer parameter called length. If the number is negative, the function prints "error" and returns. Otherwise, it prints length spaces (nothing else) and then returns.
   
   
4. Write a program that uses indent to create the indents for a diagonal line. Your program will use a for loop that calls indent to print the following (based on user input):

   % ./a.out 
   Enter height: 5
   *
    *
     *
      *
       *
   % 
   
   

   
   
   
5. Create a file called data1.txt. Put ten assorted hobbit heights¹ (in meters) in it, separated by spaces, and save it. Now write a program that reads the ten numbers with a loop and prints them out.
   
   
6. Modify 5 so that the same ten heights are read into a type double array of ten elements. After the array is full, use a separate loop to print the contents of the array on a single line.
   
   
7. Modify 6 so that after you print the array, you call a function that takes the array and its size as a parameter, and computes and prints the average height.
   
   
8. As you program, practice all of your Unix commands that have been introduced in lab and class: ls, pwd, cd, cp, rm, mv, and mkdir because they will be on the exams.
   
   

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