1 / 28

Programming Basics using Real-life examples

Programming Basics using Real-life examples. Activities. Recipe Assembly instructions for a toy Map out the plan at amusement park A busy day schedule What is the common idea for all these activities?. Programming problem: Using sequence structure.

anisa
Download Presentation

Programming Basics using Real-life examples

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Programming Basics usingReal-life examples

  2. Activities • Recipe • Assembly instructions for a toy • Map out the plan at amusement park • A busy day schedule What is the common idea for all these activities?

  3. Programming problem: Using sequence structure • Compute the weighted score based on individual assignments’ scores. Let us say there are only 3 assignments & 2 exams, each with max score of 100. Respective weights are (10%, 10%, 10%, 35% and 35%) • Sample input & output: Input: 100 100 100 95 95 Output: 96.5%

  4. Pseudocode Prompt & get the score for assignment1 Prompt & get the score for assignment2 Prompt & get the score for assignment3 Prompt & get the score for exam1 Prompt & get the score for exam2 weightedScore = (assignment1 + assignment2 + assignment3) * 0.1 + (exam1 + exam2) * .35 output weightedScore

  5. Activities • Drive car or take DART bus? • Party or study? • Fly or drive? What is the common idea for all these activities?

  6. Programming problem:using decision structure Get hourly pay rate & # of hours, compute the weekly pay, but do not pay for hours beyond 50. Sample inputs:

  7. Pseudocode Prompt & get hourly pay rate & # of hours IF hours <= 50 pay = hours * payRate; ELSE pay = 50 * payRate; ENDIF output pay

  8. C code Prompt & get hourly pay rate & # of hours if (hours <= 50) pay = hours * payRate; else pay = 50 * payRate; output pay

  9. Programming problem:using decision structure V2: Get hourly pay rate & # of hours, compute the weekly pay, but do not pay for >50 hours. Also, pay 1.5 times regular pay for overtime hours (that is, # of hours beyond regular 40 hours). First 40 hours: payRate Next 10 hours: payRate * 1.5 Beyond 50 hours: 0

  10. pseudocode IF hours <= 40 pay = payRate * hours; ELSE IF hours <= 50 pay = payRate * 40 + payRate * 1.5 * (hours – 40); ELSE pay = payRate * 40 + payRate * 1.5 * 10;

  11. pseudocode #2 overHours = hours – 40; IF hours <= 40 pay = payRate * hours; ELSE IF hours <= 50 pay = payRate * 40 + payRate * 1.5 * overHours; ELSE pay = payRate * 40 + payRate * 1.5 * 10;

  12. pseudocode #3 hours = (hours > 50 ? 50 : hours); IF hours <= 40 pay = payRate * hours; ELSE pay = payRate * 40 + payRate * 1.5 * (hours – 40);

  13. pseudocode #4 hours = (hours > 50 ? 50 : hours); IF hours <= 40 pay = payRate * hours; ELSE basePay = payRate * 40; overPay = payRate * 1.5 * (hours – 40); pay = basePay + overPay;

  14. Activities • Bring in tons of purchased items from car to house • Load up uhaul truck when cleaning up apartment • Eat cookies from a box • Taking an exam that has several questions What is the common idea for all these activities?

  15. Programming problem: Using repetition structure Compute the average score for the whole class.

  16. Are we ready to code it?

  17. Guessing game • Guess a number between 1 and 100 in your mind. Write a program so that the computer will ask you a series of questions and determine that number based on your answers. Repeat the following steps as many times as needed: • Computer asks, “Is it NN?” • User responds with <, =, or >

  18. Pseudocode Range – 2 variables: low = 1 and high = 100 • compute mid = (low + high) / 2 • Ask the user: Is it mid? • Get user response • adjust low or high based on response • repeat as needed

  19. Detailed pseudocode Initialize range – 2 variables: low = 1 and high = 100 do { compute mid = (low + high) / 2 Ask the user: Is it mid? Get user response if (response == ‘<‘) high = mid-1; else if (response == ‘>’) low = mid+1; while (response != ‘=‘);

  20. Are we ready to code it?

  21. Are we ready to code it? • Google for “Java random number generation”

  22. Guessing game V2 – Role reversal • Let the computer guess a number between 1 and 100. Write a program so that the computer will answer a series of your questions and you will determine the number based on computer’s responses.

  23. Pseudocode • Generate a random number between 0 and 100: assign rand() % 101 to a variable. • then enter the loop • get a guess from the user • output <, >, or = repeat until user enters =

  24. Are we ready to code it? • How to make the computer guess a number?

  25. Summary • All programs have only 3 control structures: Sequence, decision & repetition • Problem description  High level idea  Detailed Pseudocode  Implement in specific language  Executable program

  26. C++ strings • Similar functionality to hangman game • Write a method to return # of tries to guess all the letters in a given word. • Sample run: Guess the letters in *******: s letters in s******:

  27. Pseudocode for guessWord() • bool guessed[100];  initialize to false using loop • int exposedCount = 0; • int len = word.length(); for(int i = 0; i < len ; i++) guessed[i] = false; do { for(int i = 0; i < len ; i++) cout << (guessed[i] ? word[i] : “*”); include code for getting next guess from the user and updating guessed[] array and exposedCount. } while (exposedCount < len);

More Related