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[an error occurred while processing this directive] DMS102/CSC170D: Introduction to Web Development
Spring 2013 [an error occurred while processing this directive]
Assignment 4: Expressions and Conditions

  1. [3 pts] Create a page that (a) asks the user for their favorite flavor of ice cream; (b) uses the answer in a followup question; and (c) and displays the answer to that second question.
  2. [3 pts] Create a page that asks the user for two numbers (that is, asks twice for one number each time) and then displays the numbers and their sum, difference, product, and quotient as a table in the page.
  3. [3 pts] Create a page that asks the user for a number and reports whether or not the number is even. Hint: Think what it means to be even and check out the remainder operator (%).
  4. [3 pts] Fix your script from question 2 so that it displays an appropriate message for the quotient if the user enters the number 0.
  5. [3 pts] Create a page that asks the user for an hour (a number) between 0 and 23 and reports whether the hour corresponds to morning (6-11), afternoon (12-18), or night (18-23 and 0-5).
  6. [3 pts] Create a page that asks the user for their name and their favorite genre (kind) of music, and then does the following:
    • If their favorite style of music is jazz, ask what instrument they prefer. If the answer is saxophone, ask if they prefer soprano, alto, or tenor sax.
    • If their favorite style of music is classical, ask which composer they prefer. If the answer is Mozart, ask which piece is their favorite.
    • Otherwise, ask who is their favorite artist.
    Have your script produce a nice summary of the answers as the content of the page.

Things to think about

  • Understand the difference between strings and numbers (even though Javascript converts many things to strings when necessary).
  • Understand that even though Javascript is a weakly (or loosely) typed language, nonetheless values are typed.
  • Check out the typeof operator which can be helpful in debugging type problems.
  • Conditional statements are the most basic building block of programs that do more than one thing.
  • Understand the role of curly braces ({ and }) in delimiting blocks, especially in if statements.
  • Understand how to use whitespace (indentation) in your programs to improve readability, especially of blocks, but realize that whitespace is almost always not actually meaningful in Javascript (unlike, say, Python).

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Last update: Thursday, 07-Feb-2013 09:41:35 EST

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