Lab4

JPohlmann/Lab4/Lab4.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

JPohlmann/Lab4/src/CannonBall.java

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+import java.util.Scanner;
+
+public class CannonBall {
+    public static void main(String[]args){
+        Scanner sysIn= new Scanner(System.in);
+        int input = sysIn.nextInt();
+        double result=cannonBall(input);
+        System.out.println(result);
+    }
+    private static double cannonBall(int input){
+        double result=0;
+        for(int i=input; i>0; i--){
+            result+=i;
+        }
+        return result;
+    }
+}

JPohlmann/Lab4/src/Palindrome.java

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+import java.util.Scanner;
+
+public class Palindrome {
+    public static void main(String[]args){
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("Enter the Word");
+        String string = scanner.nextLine();
+        if(isPal(string))
+            System.out.println(string + " is a palindrome");
+        else
+            System.out.println(string + " is not a palindrome");
+    }
+    public static boolean isPal(String s){
+        if(s.length()== 0|| s.length() ==1)
+            return true;
+        if(s.charAt(0)==s.charAt(s.length()-1))
+            return isPal(s.substring(1, s.length()-1));
+        return false;
+
+    }
+}

JPohlmann/Lab4/src/ReverseString.java

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+import java.util.Scanner;
+
+public class ReverseString {
+    public static void main(String[]args){
+        Scanner sysIn = new Scanner(System.in);
+        String stringInput= sysIn.next();
+        String result = reverseString(stringInput);
+        System.out.println(result);
+    }
+    public static String reverseString (String stringInput){
+       int length= stringInput.length();
+       char[] reverse = new char[length];
+       for(int i = 0; i < length; i++ ){
+           reverse[i]= stringInput.charAt(length-1-i);
+       }
+       String reverseString1= new String(reverse);
+       return reverseString1;
+
+    }
+}

JPohlmann/Lab4/src/Sorting.java

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+import java.util.Arrays;
+import java.util.Scanner;
+
+public class Sorting {
+    public static void main(String[]args){
+        System.out.println("What is your List Size?");
+        Scanner sysIn = new Scanner(System.in);
+        int listSize = sysIn.nextInt();
+        int[] sorter= new int[listSize];
+        Scanner inputNum = new Scanner(System.in);
+        for(int i=0; i<listSize; i++){
+            System.out.println("Enter Number ");
+            int num = inputNum.nextInt();
+            sorter[i]=num;
+        }
+        String result=Sorting(sorter);
+        System.out.println(result);
+        System.out.println("Have a Good Day!");
+
+
+
+    }
+    private static String Sorting(int[] sorter){
+        int[]y;
+        Arrays.sort(sorter);
+        y=sorter;
+        return (Arrays.toString(y));
+    }
+}

JPohlmann/Lab4/src/Temperature.java

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+import java.util.Scanner;
+
+public class Temperature {
+    public static void main(String[] args){
+        Scanner sysIn= new Scanner(System.in);
+        float fTemp=sysIn.nextFloat();
+        float result= fConversion(fTemp);
+        System.out.println(result);
+    }
+    public static float fConversion(float F){
+        float Celcius = ((F-32)*5/9);
+        return Celcius;
+    }
+
+}

JPohlmann/Lab4/src/Triangle.java

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+import java.util.Scanner;
+
+public class Triangle {
+    public static void main(String[] args){
+        System.out.println("Write Vertices in form 'x y' with one on each line.");
+       Scanner sysIn= new Scanner(System.in);
+       int vertice1X = sysIn.nextInt();
+       int vertice1Y= sysIn.nextInt();
+       int vertice2X = sysIn.nextInt();
+       int vertice2Y = sysIn.nextInt();
+       int vertice3X = sysIn.nextInt();
+       int vertice3Y = sysIn.nextInt();
+        double result1= sideOne(vertice2X,vertice1X,vertice2Y,vertice1Y);
+        double result2= sideTwo(vertice3X,vertice2X,vertice3Y,vertice2Y);
+        double result3 = sideThree(vertice3X,vertice1X,vertice3Y,vertice1Y);
+        System.out.println("The Side Lengths are " + result1+" "+result2 +" "+result3);
+    }
+    public static double sideOne(int xf, int xi, int yf, int yi){
+        double sideOne = Math.pow((xf-xi),2)+Math.pow((yf-yi),2);
+
+
+        return Math.sqrt(sideOne);
+
+    }
+    public static double sideTwo(int xf, int xi, int yf, int yi){
+        double sideTwo = Math.pow((xf-xi),2)+Math.pow((yf-yi),2);
+        return Math.sqrt(sideTwo);
+    }
+    public static double sideThree(int xf, int xi, int yf, int yi){
+        double sideThree = Math.pow((xf-xi),2)+Math.pow((yf-yi),2);
+        return Math.sqrt(sideThree);
+    }
+}

JPohlmann/Lab4/src/recursiveFactorial.java

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+import java.util.Scanner;
+
+public class recursiveFactorial {
+    public static void main(String[] args){
+        Scanner sysIn = new Scanner(System.in);
+        int number = sysIn.nextInt();
+        String result = factorial(number);
+        System.out.println(result);
+    }
+    private static String factorial(int number){
+        String result= number +":"+number;
+        for(int i = number; i>1;i-- ){
+            int number2= i-1;
+            result +="*"+number2;
+        }
+        return result;
+    }
+}

Lab4 probs

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+

README.md

@@ -18,5 +18,7 @@ I would like you to complete what you can prior to next Wednesday's Lecture.
 
 #### Recursion
 
-* Write a program that takes an integer, and prints the factorial of the integer.  ex: 5 factorial is 5*4*3*2*1
-* Write a 
+* Write a program that takes an integer, and prints the factorial of the integer.  ex: 5 factorial is 5 * 4 * 3 * 2 * 1
+* Write a program that will calculate the number of cannon balls in a trinagular pyramid that has the intered integer number of rows.
+(Note: this means that any layer of the pyramid has an equalateral triangle of cannonballs.  The top layer has 1 cannon ball, the one below that has 3, etc.)
+* Use recursion to determin if a string passed in is a palindrome.  Your program will be given a string.