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Hands on Projects

Hands on Projects. Dr. Bernard Chen Ph.D. University of Central Arkansas July 9 th 2012 CS4HS@UCA. Game 1: Greetings. The computer asks a player to input his/her name. Afterwards, the computer greetings the player with the name.

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Hands on Projects

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  1. Hands on Projects Dr. Bernard Chen Ph.D. University of Central Arkansas July 9th 2012 CS4HS@UCA

  2. Game 1: Greetings • The computer asks a player to input his/her name. • Afterwards, the computer greetings the player with the name. • The computer offers the player an opportunity to view the encoding of the name. • The computer displays the encoding if the player chooses to do so. Otherwise, the computer says good-bye.

  3. Questions for this game • Q: How does a computer ask a player to type in his/her name? • Q: How can a computer remember the player’s name? • Q: How does a computer offers the player the opportunity to view the encoding of the name? • Q: How does computer change name into numbers?

  4. Game1: Greeting hello = 'Hello world! ' print(hello) print('What is your name?') myName = input() print('\nIt is good to meet you, ' + myName) print('I store your name as integers. \n') res = input('Do you want to see them (Y/N)?') res = res.lower() if res == 'y' or res == 'yes': print('Yes, here is how I stored your name:') for x in myName: print(x, ' => ', ord(x)) else: print('All right, see you next time') print('Bye!')

  5. hello variable hello = 'Hello world! ' print(hello) • We use hello as a variable

  6. User input their name print('What is your name?') myName = input() • Use the input() function

  7. Print out user’s name print('\nIt is good to meet you, ' + myName) print('I store your name as integers. \n') • \n is used for print a new line • print() function is actually very powerful, it can print not only “strings” but also variables • You can use “,” or “+” to connect two things (or more) together with space to separate them

  8. Give user a choice,change res to lower case res = input('Do you want to see them (Y/N)?') res = res.lower() • Another type of input() function • We can actually put the information display for user inside of the input() function • Change user’s input into lower case by using res.lower() function

  9. If statement if res == 'y' or res == 'yes': print('Yes, here is how I stored your name:') for x in myName: print(x, ' => ', ord(x)) else: print('All right, see you next time') print('Bye!')

  10. The chr( ) and ord( ) functions • The chr(n) function takes an integer ASCII value n and returns a string with that ASCII value's character.  >>> chr(65) 'A’ >>> chr(66) 'B‘ >>> chr(53) '5’ • The ord(c) function takes a single character c and returns the integer ASCII value of c. >>> ord('A') 65 >>> ord('B') 66 >>> ord('5') 53

  11. Game 2: Guess a number • The computer generates a random number. • Afterwards, the computer asks user to input one number. • The computer checks the number to determine if the user guesses the correct number, if not, the computer provides the hint. • The computer only let the user guess 3 times at most.

  12. Guess a number import random #import the random library number = random.randint(1,100) for x in range(3): print('Guess a number between 1 and 100:') myGuess = int(input()) if (myGuess == number): print ('You win! Congratulations! ') break elif (myGuess < number): print ('Go up') else: print ('Go down')

  13. Questions for this game • Q: How does a computer generate a random number? • Q: How can a computer tell that the user guessed the correct number? • Q: How does a computer provides the hint to user if the guessed number is incorrect? • Q: How does a computer control the number of times that a user can guess?

  14. Q: How does a computer generate a random number? import random #import the random library number = random.randint(1,100) • How do we generate a random number between one and one hundred? • We have a function named randint() available in the module named random • We import the module, then call the function

  15. User input a number for x in range(3): print('Guess a number between 1 and 100:') myGuess = int(input()) • Use for loop here to control how many times that a user can guess

  16. Q: How does a computer provides the hint to user if the guessed number is incorrect? if (myGuess == number): print ('You win! Congratulations! ') break elif (myGuess < number): print ('Go up') else: print ('Go down')

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