Grandparents U, 2017 Part 1 - Western Washington Universityjagodzf/teaching/...Pokemon Go. CSCS 141...

Grandparents U, 2017Part 1

Computer Programming for Beginners

Filip Jagodzinski

CSCS 141Computer Programming I

Preliminaries : Course Website

All of these slides will be provided for you online ...

... So for the time being just relax and listen!


Introduction

Who here has played Pokemon Go?


Introduction


What about Super Mario Brothers?

Candy Land?


Introduction


What about Super Mario Brothers?

Candy Land?

Q: How are such games

made?


Learning how to Program …

Computer programming is done using a computer

• CODE, or “coding”

• You learn by making mistakes, sort of like learning how to ride the bicycle

Q: How many people were

involved in making Pokemon Go



Computer programming is done using a computer

• CODE, or “coding”

• You learn by making mistakes, sort of like learning how to ride the bicycle

Hundreds!

Q: How many people were

involved in making Pokemon Go



Learning how to program is like learning a new language

• You learn by making mistakes• Then you try some more




• You learn by making mistakes• Then you try some more• Then you make more mistakes


Difficult question : What happens next?



• You learn by making mistakes• Then you try some more• Then you make more mistakes• Then you try some more




• You learn by making mistakes• Then you try some more• Then you make more mistakes• Then you try some more• Then you make bigger mistakes and everything breaks


Programming … is an art and a science

Q: These all depict programs … what do they have in common? How are they different?

Programs (apps) on your smartphone

A nice game of thermonuclearwar

A simple python program



Solutions:(as perceived by the end-

user)



Solutions:(as perceived by the end-

user)

Programs:(implementation

of a program)


CPU – The “brain” of the computer

CPUCentral Processing Unit

Q: What does a CPU “do”?Q: How does a CPU work?



CPUCentral Processing Unit

Q: What does a CPU “do”?Q: How does a CPU work?

Instruction(input)

Result(output)



Instruction(input)

Result(output)

That’s what we want to write … the “instructions” for a computer so that when the computer runs our

program the program behaves as designed


Our goals – Overview of the Course

Write a program that prints “Hello world” to the screen

Write a program to store and display your name and age





Write a program to predict what clothing you should wearAI





Write a program to predict what clothing you should wear

Write a program that prints your name to the screen using turtles

AI

DEMO


The programming language that we’ll be using …


print

Luckily, python has many built in functions – these are features of a program that somebody else has written, and which you will use to build your custom program

One of the most basic function is named print … here’s how you use it


Variables

Variables are one of the most basic parts of ANY program and ANY programming language … why do we need them?


Variables

Variables are one of the most basic parts of ANY program and ANY programming language … why do we need them?

Computers are really good at storing (and “remembering”) information (data).

Humans on the other hand are

pretty lousy at it


Variables

A variable is a name that refers to a value. Computers can store (remember) many values, hence a program can have many (millions, if the conditions are

right), of variables

When you (a human) try to “remember” something, you

make associations

Q: how does a computer program “remember” things


Variables




make associations

• My mom’s hair color is blond• My dog’s name is Emma• I teach at WWU



Variables




make associations

• My mom’s hair color is blond• My dog’s name is Emma• I teach at WWU

My mom’s hair color …

My dog’s name …

I teach at …

EMMA



Variables



It is a three step process … you must come up with a name for a variable, and assign it a value



Variables



Step 1 … come up with

variable names

Q: What are good variable names to hold the data

“blond”, “Emma” and 34


My dog’s name … EMMA

My favorite number … 34



Variables



myMomsHairColor

myDogsName

faveNum






Variables



myMomsHairColor

myDogsName

faveNum

Step 2 : use the assignment operator to

“set” the value of a variable






Variables



myMomsHairColor =

myDogsName =

faveNum =






Variables



myMomsHairColor =

myDogsName =

faveNum =

Step 3 : to the right of the assignment

operation you place the value that you

want to assign to the variable name on the

left






Variables



myMomsHairColor = “blond”

myDogsName = “Emma”

faveNum = 34


Now you can use the variable in your program, and the

computer will know it is referring to the data that you

assigned to that variable


Variables

Putting it all together, what does the below program do when you run it?


The input function

One other important function in python is named input

Use it to ask the user to provide an answer to a question, which you can then store in a variable


Doing something over and over again …

Humans are also really good at making mistakes if we are tired or doing something over and over again … but computers are REALLY good at

doing something over and over again

Write a program that prints “Hello”

9 times

But there’s an easier way!






9 times







9 times







9 times







9 times







9 times




For this morning’s task, write a program that

asks you to input your name, your age, and

prints that information to the screen 15 times


Conditional

One neat thing about programs is that they seem to be “smart”

Goal : Write a program that will tell you want clothing to wear


Conditional



If you want your program to be intelligent, use if


Conditional



age = int(input(“what is your age”))

if (age > 10) :

print(“you are older than 10 years”)


Conditional




if (age > 10) :


If the input is a number, use the int function in combination with input


Conditional




if (age > 10) :


The if is used to check whether something is true or not


Conditional




if (age > 10) :


The code inside the if is run ONLY If the if statement was true


Conditional




if (age > 10) :


raining= input(“is it raining”)

temp = int(input(“what is the temp”))

if (raining == “yes” and temp < 40) :

print(“wear a hat, globes, and jacket!”)


Conditional




if (age > 10) :






Check the value of a variable by using the double equal sign!


Conditional




if (age > 10) :






Use and to check the values of several things. The above code checks if the variable raining has the value “yes” and the temperature is less than 40



For your second program, you’ll write a program that asks what temperature it is

and whether it is raining, and it will tell you what clothing

to wear!


Hands-on exercises in the lab!

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