Unit #1-04

Learning Outcome

At the end of this lesson, you will be able to:

• write a program that actually does something useful, well sort of

Review

• review proper style

Lesson

• the entire point of creating electronic computers was to automate doing math, so lets get the computer to do simple math for us

  • demo of python doing basic math (see source code below: ↓)

    • add

    • subtract

    • multiply

    • divide

    • exponent

      • in Python and C "^" actually means Bitwise XOR!

        • x**y means exponent in python

        • pow(x,y) in C

• how to format expressions along with text in a print statement

  • see: Python String Formatting

    • and this video

  • see: C String Formatting

• go over test cases and why they are needed

  • see: Test Cases

  • see: What can happen when proper testing is not done!

    • what it means to be an Engineer in Canada; and their strange traditions!

Daily Assignment

• create a program that calculates the area and perimeter of a rectangle with dimensions 5 cm by 3 cm, with proper style and shows 3 decimal places (see terminal below: ↓)

  • come up with just one (1) test case for area and perimeter, BEFORE YOU WRITE THE CODE to ensure you know what the answer should be BEFORE you start coding

    • hint: the test case is:
      a = l × w or a = 5 × 3
      p = 2(l + w) or p = 2(5 + 3)
      since there is only 1 correct answer each!

• push the changes back to GitHub

• NOTE: the SI standard for using units with numbers!

  • Area is 15 cm².

    • NOTE: the space after the number and the units and using superscripts for squared  and NOT "^"!

    • to get the squared, google "unicode squared"

• read Introduction, Computer Based Problem Solving

  • the entire chapter

Extra

• create the area and perimeter program in C, with proper style

  • you only have to do test cases once, not for each language

    • you better get the same result each time!

• in C you might need to do the following while building with the math library:

  • https://stackoverflow.com/questions/1033898/why-do-you-have-to-link-the-math-library-in-c