Contents
- ./Grades.java
- ./MathExample.java
- ./Credit.java
- ./ArrayLength.java
- ./ArraysExample.java
./Grades.java 1/5
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/**
* This class demonstrates using a switch statement
*
* @author Sara Sprenkle
*
*/
public class Grades {
/**
* Called when user runs
* java Grades
*/
public static void main(String[] args) {
char grade = 'b';
switch(grade) {
case 'a':
case 'A':
System.out.println("Congrats!");
break;
case 'b':
case 'B':
System.out.println("Not too shabby!");
break;
case 'c':
case 'C':
case 'd':
case 'D':
System.out.println("You are passing but you could improve.");
case 'f':
case 'F':
System.out.println("Not good. You failed.");
default:
System.out.println("Error: not a grade");
}
}
}
./MathExample.java 2/5
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/**
* This class demonstrates using constants and methods from Java's Math class
*
* @author Sara Sprenkle
*
*/
public class MathExample {
/**
* Called when user runs
* java MathExample
*/
public static void main(String[] args) {
int radius = 7;
double circumference = 2 * Math.PI * radius;
double area = Math.PI * radius * radius;
double area2 = Math.PI * Math.pow(radius, 2);
System.out.println("A circle with radius " + radius + "...");
System.out.println("\t has a circumference of " + circumference);
System.out.println("\t and an area of " + area);
System.out.println("\t verifying area " + area2);
// practicing with trigonometric functions
double angle = Math.PI;
double sin_angle = Math.sin(angle);
System.out.println("\n***** Trig Practice *****");
System.out.println("The sine of " + angle + " is " + sin_angle);
System.out.println("The cosine of " + angle + " is " + Math.cos(angle));
}
}
./Credit.java 3/5
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/**
* This class demonstrates importance of scope
*
* @author Sara Sprenkle
*
*/
public class Credit {
/**
* Called when user runs
* java Credit
*/
public static void main(String[] args) {
int availableCredit = 100;
int purchaseAmount = 110;
boolean approved = false; // must be initialized or it's a compiler error.
if (purchaseAmount < availableCredit) {
availableCredit -= purchaseAmount;
approved = true;
}
if( ! approved )
System.out.println("Denied");
else
System.out.println("Approved");
}
}
./ArrayLength.java 4/5
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/**
* This class demonstrates use of "length" field for arrays.
*
* @author Sara Sprenkle
*
*/
public class ArrayLength {
/**
* Called when user runs
* java ArrayLength
*/
public static void main(String[] args) {
int[] array = new int[10];
for (int i = 0; i < array.length; i++) {
array[i] = i * 2;
}
for (int i = array.length -1; i >= 0; i--) {
System.out.println(array[i]);
}
}
}
./ArraysExample.java 5/5
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// import the methods from the Arrays class
import java.util.Arrays;
/**
* This class demonstrates using arrays and the Arrays class
*
* @author Sara Sprenkle
*
*/
public class ArraysExample {
/**
* Called when user runs
* java ArraysExample
*/
public static void main(String[] args) {
double[] array = new double[10];
// fill the array with PI... mmm... pie...
Arrays.fill(array, Math.PI);
for( int i=0; i < array.length; i++ ) {
System.out.println("array[" + i + "] = " + array[i]);
}
}
}
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