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Computer Science @ Rochester
Computer Science Department : Hajim School of Engineering & Applied Sciences Skip to main content [an error occurred while processing this directive] File: body-title.shtml Creator: George Ferguson Created: Tue Dec 6 14:34:49 2011 Time-stamp: SSI variables for this template: section_name First line of title on page (if any) title Title shown on page

[an error occurred while processing this directive] CSC170: Introduction to Programming and the Web
Fall 2012
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Assignment 5: Iteration

  1. [2 pts] Create a page that uses a for loop to demonstrate each of the six possible HTML heading types (h1..h6).
  2. [2 pts] Create a page that asks the user for a number n and then uses a for loop to compute the value of n! (the factorial function). I'll save you the trouble of looking it up: n! is the product of all the numbers from 1 up to and including n.
  3. [2 pts] Create a page that asks the user for a year (number) and displays whether or not it is a leap year. Use only one ``if'' statement with a Boolean expression to do the test. The definition of a leap year is a year that is evenly divisible by 4, but not evenly divisible by 100, unless also evenly divisible by 400.
  4. [4 pts] Building on the example from Question 3 of Part 1, this time we will process all the students in the class, not just one. So create a page that helps with grading as follows:
    • Ask the user for the name of a student. If there are no more students to enter, the user can enter "stop".
    • As before, ask the user for that student's grades on the assignments one at a time, entering -1 to stop entering grades for that student.
    • Display the collected grades, number of grades, and average grade for each student as well as the class average, using a table. Since each student may have different numbers of grades, you can display all the individual grades in one table cell. That is, your columns are (probably) name, grades, number of grades, and average grade.

Things to think about

  • There are many ways to write iterative programs:
    • The book describes counter-controlled and sentinel-controlled loops, which are different ways of deciding when to end the iteration;
    • while, for, and do-while loops, which are different control statements for formulating your iteration in Javascript.
    Deciding how to express your algorithm using the various control constructs is part of the art of programming. But you should be familiar with all the tools in the toolkit so you can make the right choices when designing your program.
  • Iteration control constructs can be nested, just like HTML elements and conditionals. Makes you think that nesting (embedding) is kind of an important concept, no?

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Last update: Monday, 01-Oct-2012 19:05:13 EDT

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