comp 110: introduction to programming tyler johnson january 28, 2009 mwf 11:00am-12:15pm sitterson...
TRANSCRIPT
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COMP 110:Introduction to Programming
Tyler JohnsonJanuary 28, 2009
MWF 11:00AM-12:15PMSitterson 014
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COMP 110: Spring 20092
Announcements
Lab 1 due tomorrow by midnight
TA Office Hours (SN 043)Nick Dragan - Tues/Thurs 2-3pm• [email protected]
Georgi Tsankov – Tues 4-6pm• [email protected]
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COMP 110: Spring 20093
Questions?
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COMP 110: Spring 20094
Today in COMP 110
Documentation and Style
Branching
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COMP 110: Spring 20095
Documentation & Style
The programs you write should be correct
They should also be easy to read and understand
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COMP 110: Spring 20096
Variable Names
Part of creating good programs is choosing meaningful variable names
If a variable stores a count, call it “count”, if a variable represents a cost, call it “cost”
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COMP 110: Spring 20097
Variable Names
Variables are typically named using only numbers and digits
int count;int grade1, grade2;
Underscores are generally avoided in variable names
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COMP 110: Spring 20098
Capitalization in Variable Names
Variable and object names are generally written in lower case
double cost, ratio;
Names consisting of multiple words should use capital letters at word boundaries
int numberOfTries;double costOfLiving;
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COMP 110: Spring 20099
Capitalization in Class Names
Class names generally have the first letter capitalized
Scanner, String
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COMP 110: Spring 200910
Naming Examples
String sentence;
Scanner keyboard;
String personalGreeting;
YourClass yourObject;
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COMP 110: Spring 200911
Comments
The best programs are self-documenting
It should be obvious what the program does just by reading the program itself
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COMP 110: Spring 200912
Comments
Choosing meaningful variables names is sometime not enough
Comments allow the programmer to leave notes in the code to aid in understanding
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COMP 110: Spring 200913
Comments in Java
Two Types
Single-line comment• Begins with “//”
int i; //this is a single-line comment, write whatever you want
Multi-line comment• Everything within /* */
public class Program { /*
This is a multi-line comment. The compiler will completely ignore this text*/public static void main(String[] args) {
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COMP 110: Spring 200914
Comments
Using a program header is a great way to give basic information about a program
AuthorDescription of the programInputsOutputs
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COMP 110: Spring 200915
Comments
You should use comments to explain any non-obvious details in your programs
double radius; //in inchesdouble area; //in square inches
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COMP 110: Spring 200916
Indentation
Programs have a nested structureYour indentation should reflect this
import java.util.Scanner;public class FirstProgram{ public static void main(String[] args) { System.out.println("Hello out there."); System.out.println("I will add two numbers for you."); System.out.println("Enter two whole numbers on a line:");
int n1, n2;
Scanner keyboard = new Scanner(System.in); n1 = keyboard.nextInt(); n2 = keyboard.nextInt();
System.out.println("The sum of those two numbers is"); System.out.println(n1 + n2); }}
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COMP 110: Spring 200917
Placement of Braces
Some prefer
public class FirstProgram{ …}
Others prefer
public class FirstProgram { …}
It doesn’t matter what you choose, just be consistent
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COMP 110: Spring 200918
Using Named Constants
You should always give a name to constants such as PI
It may not be obvious to the reader where such a number comes from
final double PI = 3.14159;
area = PI * radius * radius; //is much clearer thanarea = 3.14159 * radius * radius;
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COMP 110: Spring 200919
Naming Constants
The style for naming constants if different than for variables
Typically use all caps with underscores separating words
final int DAYS_PER_WEEK = 7;final double MASS_OF_EARTH = 5.9742e24; //kgfinal float INTEREST_RATE = 5.55;
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COMP 110: Spring 200920
Branching
Sometimes, it is necessary to make decisions in programs
ExampleThe remainder operator can be used to determine if a number n is even or odd
If n%2 equals 0, n is even
If n%2 equals 1, n is odd
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COMP 110: Spring 200921
Branching
int result = n % 2;
Evaluate
result is 0?
Execute
Print “n is even”
Execute
Print “n is odd”
true false
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COMP 110: Spring 200922
If-Else Statement
An if-else statement allows us to make decisions in a program
int result = n % 2;
if(result == 0)System.out.println(“That number is even!”);
elseSystem.out.println(“That number is odd!”);
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COMP 110: Spring 200923
If-Else Example
int n = 2int result = n % 2;
if(result == 0)System.out.println(“That number is even!”);
elseSystem.out.println(“That number is odd!”);
System.out.println(“Finished!”);
result = 0
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COMP 110: Spring 200924
If-Else Example
int n = 3int result = n % 2;
if(result == 0)System.out.println(“That number is even!”);
elseSystem.out.println(“That number is odd!”);
System.out.println(“Finished!”);
result = 1
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COMP 110: Spring 200925
Boolean Expressions
(result == 0) is a boolean expression
Boolean expressions evaluate to either true or false
Examples10 > 5, (true)4 > 6, (false)Integers are whole numbers, (true)
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COMP 110: Spring 200926
Java Comparison Operators
Math
Java Name
= == Equal to
≠ != Not equal to
> > Greater than
≥ >= Greater than or equal to
< < Less than
≤ <= Less than or equal to
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COMP 110: Spring 200927
If-Else Statement Syntax
Syntaxif(Boolean_Expression)Statement_1
elseStatement_2
If Boolean_Expression is true, Statement_1 is executed; otherwise Statement_2 is executed
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COMP 110: Spring 200928
Compound Statements
Multiple statements can be included in each branch
Called a compound statementEnclose between {…}
if(Boolean_Expression) {Statements_1
}else { Statements_2}
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COMP 110: Spring 200929
If without Else
Syntax
if(Boolean_Expression)Statement_1
Example
if(accntBalance < 0) //subtract a fee for overdraftsaccntBalance = accntBalance – FEE;
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COMP 110: Spring 200930
Common Comparison Mistakes
Don’t confuse the assignment operator (=) with the comparison operator (==)!
if(x == y) //valid
if(x = y) //syntax error
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COMP 110: Spring 200931
Common Comparison Mistakes
Don’t use a semi-colon here
if(x == y) ; //syntax errorSystem.out.println(“x equals y”);
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COMP 110: Spring 200932
Common Comparison Mistakes
Don’t use == to compare StringsUse string.equals(A_String) or string.equalsIgnoreCase(A_String)Example
String s1 = keyboard.next(); //read in a stringif(s1.equals(“Hello”))
System.out.println(“The String is Hello.”);else
System.out.println(“The String is not Hello.”);
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COMP 110: Spring 200933
The && Operator (AND)
We can check for multiple conditions using the && (AND) operator
Meaning is similar to that of English “and”
if (temperature > 50 && temperature < 75) {// walk to school if 50 < temperature < 75
}else {
//otherwise drive to school}
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COMP 110: Spring 200934
The || Operator (OR)
We can also join boolean expression with || (OR)
Meaning is similar to that of English “or”
boolean raining, runningLate;
…if (raining || runningLate) {
//drive to school}
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COMP 110: Spring 200935
The ! Operator (NOT)
Boolean negation!false is true!true is false
Example
boolean cloudy;
…
if (!cloudy) {// walk to school if it’s not cloudy
}
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COMP 110: Spring 200936
Effect of Boolean Operators
A B A && B
A || B !A
true true true true false
true false false true false
false true false true true
false false false false true
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COMP 110: Spring 200937
Boolean Expression Examples
Using x = 5, y = 10, z = 15
(x < 5 && y > x)• (false && true) -> false
(x <= 5 || y > x)• (true || true) -> true
(x > 3 || z != 15)• (true || false) -> true
(!(x > 3) && x + y == z)• (false && true) -> false
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COMP 110: Spring 200938
Avoiding the Negation Op
!(A < B) -->
!(A <= B) -->
!(A > B) -->
!(A >= B) -->
!(A == B) -->
!(A != B) -->
(A >= B)
(A > B)
(A <= B)
(A < B)
(A != B)
(A == B)
It’s best to avoid use of the negation operator (!) when possible
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COMP 110: Spring 200939
Nested If-Statements
It’s possible to have if statements inside other if statements
if(Boolean_Expression_1) {
if(BooleanExpression_2) {…
}}
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COMP 110: Spring 200940
Nested If Statements
ExampleWe want to perform some checks on the user’s account balance
If the balance is >= 0, we’ll add interest only if the interest rate is >= 0, and print an error message if interest rate is < 0. If the balance is < 0, we’ll subtract a fee.
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COMP 110: Spring 200941
Nested If Statements
Evaluate
balance >= 0
Evaluate
INTEREST_RATE >= 0
Execute
balance -= FEE
true false
Execute
balance = balance + balance*INTEREST_RATE
Execute
Print Error Message a
true false
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COMP 110: Spring 200942
Nested If Statements
if(balance >= 0) {if(INTEREST_RATE >= 0) balance = balance +
INTEREST_RATE*balance;else
System.out.println(“Negative Interest!”);}else
balance = balance – FEE;
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COMP 110: Spring 200943
Nested If Statements
What if we didn’t need to print the error message?
if(balance >= 0 && INTEREST_RATE >= 0) balance = balance +
INTEREST_RATE*balance;else
balance = balance – FEE;
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COMP 110: Spring 200944
Multi-Branch If Statements
What if we need to decide between many possibilities?
ExampleGiven a numeric score (0..100) determine whether the grade is an A,B,C,D, or F
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COMP 110: Spring 200945
Multi-Branch If Statements
A if: score >= 90B if: 90 > score >= 80C if: 80 > score >= 70D if: 70 > score >= 60F in all other cases
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COMP 110: Spring 200946
Multi-Branch If Statements
We could write this as follows
if(score >=90) grade = ‘A’;else if(score >=80) grade = ‘B’; else if(score >=70) grade = ‘C’; else if(score >=60) grade = ‘D’; else grade = ‘F’;
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COMP 110: Spring 200947
Multi-Branch If Statements
The preferred way to write this is
if(score >=90)grade = ‘A’;
else if(score >=80)grade = ‘B’;
else if(score >=70)grade = ‘C’;
else if(score >=60)grade = ‘D’;
elsegrade = ‘F’;
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COMP 110: Spring 200948
Multi-Branch If Statement
Syntax
if(Boolean_Expression_1)Action_1
else if(Boolean_Expression_2) Action_2
…else if(Boolean_Expression_n)
Action_nelseDefault_Action
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COMP 110: Spring 200949
Programming Demo
Write a program to read in three distinct nonnegative integers from the keyboard and display them in increasing order
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COMP 110: Spring 200950
Programming Demo
Call the three numbers a,b,c
Designing the algorithmDetermine which of a,b,c is the smallest• If it’s not a, is it b? If it’s not a or b, must be c
Determine which of the two remaining integers is smaller than the other
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COMP 110: Spring 200951
Programming Demo
Evaluate
a is smallest?
true false
a < b < c
a < c < b
Evaluate
b < ctrue false
b < a < c
b < c < a
Evaluate
a < ctrue false
c < a < b
c < b < a
Evaluate
a < btrue false
Evaluate
b is smallest?
true false
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COMP 110: Spring 200952
Programming Demo
PseudocodeAsk user for three integers, a,b,cDetermine which of a,b,c is the smallestDetermine which of the remaining two is smallerPrint a,b,c in ascending order
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COMP 110: Spring 200953
Friday
Recitation
BringLaptop (fully charged)TextbookAny questions about Program 1