All Chapter 7

All of chapter 7
Self check even
Daniel Lawson 10/4/2016
2.
numbers[0] first element , numbers[9] last element if it is 10 long,numbers[numbers.length-1] last element no matter the length
4.
int max = 38;
int min = -7;
int[] odd = new int[Math.abs(max - min+2)/2 ];
for(int i = 0;i<odd.length;i++){
    odd[i] = min + i*2;
}
System.out.println(Arrays.toString(odd));
6.

0 = 3,    1 = 3, 2    3     4 = 6,    5 = 9     6       7 = -18,    the array = [3,3,0,0,6,9,0,-18]

8.
 a. int[] a = {17,-3,42,5,9,28};

10.
public static int max(int[] array){
 int max = 0;
 for(int i = 0;i<array.length;i++){
    if(array[i] > max)max = array[i];
 }
 return max;
}
12.
traversing an arrary is manipulating an array using for loops , an example of this is the max method created in the last problem.
14.
the arrary contains 3, 24, 8, -5, 6, 1
16.
for count change the int[] list into String[] list ,change target to a char,  and then have another for loop inside hte for each loop saying for(int i = 0; i < list[n].length();i++) if list[n].charAt(i)  = target count++;
for equals change the type of list1, list 2 to String, also chang ethe if statement in the second forloop to !list1[i].equals(list2[i])
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Daniel Lawson 10/4/2016

2.
numbers[0] first element , numbers[9] last element if it is 10 long,numbers[numbers.length-1] last element no matter the length
4.
int max = 38;
int min = -7;
int[] odd = new int[Math.abs(max - min+2)/2 ];
for(int i = 0;i<odd.length;i++){
    odd[i] = min + i*2;
}
System.out.println(Arrays.toString(odd));
6.

0 = 3,    1 = 3, 2    3     4 = 6,    5 = 9     6       7 = -18,    the array = [3,3,0,0,6,9,0,-18]

8.
 a. int[] a = {17,-3,42,5,9,28};

10.
public static int max(int[] array){
 int max = 0;
 for(int i = 0;i<array.length;i++){
    if(array[i] > max)max = array[i];
 }
 return max;
}
12.
traversing an arrary is manipulating an array using for loops , an example of this is the max method created in the last problem.
14.
the arrary contains 3, 24, 8, -5, 6, 1
16.
for count change the int[] list into String[] list ,change target to a char,  and then have another for loop inside hte for each loop saying for(int i = 0; i < list[n].length();i++) if list[n].charAt(i)  = target count++;
for equals change the type of list1, list 2 to String, also chang ethe if statement in the second forloop to !list1[i].equals(list2[i])

Weather:
/**
 * Created by danie on 9/30/2016.
 */
import java.util.*;
public class weather {
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        System.out.print("How many day's high temp? ");
        int[] day = new int[s.nextInt()];
        double average = 0;
        for(int i =0;i<day.length;i++){
            System.out.print("Enter day  " +  (i+1) +": ");
            day[i] = s.nextInt();
            average+=day[i];
        }
        average /= day.length;
        System.out.printf("Average temp= %.1f\n",average);
        int count  = 0;
        for(int i = 0;i<day.length;i++){
            if(day[i] > average){
                count++;
            }
        }
        System.out.println(count + " days were above average");
        System.out.println("Temperatures: " + Arrays.toString(day));
        Arrays.sort(day);
        System.out.println("Two coldest days: " + day[0] + ", " + day[1]);
        System.out.println("Two hottest days: " + day[day.length -1] + ", "+  day[day.length-2]);
    }
}

public class mostCommon { //gets the most common number (
    public static void main(String[] args){
        System.out.println(most(655534));

    }
    public static int most(int n){
        int[] howMany = new int[10];
        while(n>0){
            int temp = n % 10;
            howMany[temp]++;
            n /= 10;
        }

        int most = 0;
        int valueOfMost = 0;
        for(int i = 0; i <10;i++){
            if(howMany[i] > most){
                most = howMany[i];
                valueOfMost = i;
            }
        }
        return valueOfMost;
    }
}

/**
 * Created by danie on 10/5/2016.
 */
//Merges multiple arrays
import java.util.*;
public class merge {
    public static void main(String[] args){
        int[] food = {1,2,3,4,5};
        int[] ood = {6,7,8,9,10};
        int[] od = {11,12,13,14,15};
        System.out.println(Arrays.toString(merge(food,ood)));
        System.out.println(Arrays.toString(merge3(food,ood,od)));
    }
    public static int[] merge(int[] a1, int[] a2){
        int[] merge = new int[a1.length + a2.length];
        for(int i  = 0; i < merge.length;i++){
            if(i < a1.length){
               merge[i]  = a1[i];
            }
            else{
                merge[i] = a2[i - a1.length];
            }
        }
        return merge;
    }
    public static int[] merge3(int[] a1, int[] a2, int[] a3){
        return merge(merge(a1,a2),a3);
    }
}
//Finds the median of the string
/**
 * Created by danie on 10/17/2016.
 */
import java.util.*;
public class median {
    public static void main(String[] args){
        int[] test = {1,2,4,3,5,6,7,9};
        System.out.println(median(test));//prints 5
    }
    public static int median(int[] a){
        int[] sort  = Arrays.copyOf(a,a.length);
        Arrays.sort(sort);
        return sort[sort.length/2];
    }
}
//reverses the order of a string
public class copy {
    public static void main(String args[]){
        int[] values = {1,2,3,4,5,6,45};
        reverseOrder(values);
        System.out.println(Arrays.toString(values));
    }
    public static void reverseOrder(int[] a){
        for(int i = 0;i<a.length/2;i++){
            int temp = a[i];
            a[i] = a[a.length -1 - i];
            a[a.length-1-i] = temp;
        }
    }
}

public class attendanceProgram {
/*
yynyyynayayynyyyayanyyyaynayyayyanayyyanyayna
ayyanyyyyayanaayyanayyyananayayaynyayayynynya
yyayaynyyayyanynnyyyayyanayaynannnyyayyayayny */ // the file to read from
    public static void main(String[] args)throws FileNotFoundException{
        File f = new File ("C:\\Users\\danie\\IdeaProjects\\project7\\src\\textfile.txt");
        Scanner s = new Scanner(f);
        int section = 1;
        while(s.hasNextLine()){
            String line =  s.nextLine();
            int[] lineValue = new int[5];
            double[] lineValueAverage = new double[5];
            for(int i = 0;i<9;i++){
                for(int j = 0;j<5;j++){
                    if(line.charAt(5*i+j)=='y')lineValue[j]+=3;
                    if(line.charAt(5*i+j)=='n')lineValue[j]+=2;
                    lineValue[j] = Math.min(20,lineValue[j]);
                }
            }

            for(int i = 0; i < 5; i++) lineValueAverage[i] = lineValue[i] * 5;
            System.out.println("Section " +section);
            System.out.println("Student points: " + Arrays.toString(lineValue));
            System.out.println("Student points: " + Arrays.toString(lineValueAverage));
            System.out.println();
            section++;
        }
    }
}

/**
 * Created by danie on 10/17/2016.
 */
import java.io.*;
import java.util.*;

/*
hello hi asdf y y y 123456 12
1234567890 1234567890
*/ // file being read from

public class wordLengths {
    public static void main(String[] args)throws FileNotFoundException{
        File f = new File("C:\\Users\\danie\\IdeaProjects\\project7\\src\\wordLengths.txt");
        wordLengths(f);
    }
    public static void wordLengths (File f)throws FileNotFoundException{
        Scanner l = new Scanner(f);
        Scanner s = new Scanner(f);
        int length = 0;
        while(l.hasNext()){
            String temp = l.next();
            length = Math.max(temp.length(),length);
        }
        int[] count = new int[length];
        while(s.hasNext()){
            String temp = s.next();
            count[temp.length()-1]++;
        }
        for(int i = 0;i <count.length;i++){
            System.out.printf(" %4d: %4d ",i+1,count[i] );
            for(int j = 0;j<count[i];j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}
// Grocery list with arrays
/**
 * Created by danie on 9/29/2016.
 */
public class GroceryList {
  public static final int size = 10;
  private GroceryItemOrder[] total = new GroceryItemOrder[size];
  private int count = 0;

    public GroceryList(){
        for(int i = 0;i<total.length;i++)total[i] = new GroceryItemOrder("null",0,0);
    };
    public void add(GroceryItemOrder item){
        total[count] = item;
        count++;
    }
    public double getTotalCost(){//returns the total cost of all the items
        double sum = 0;
        for(int i = 0;i< total.length; i++)sum+=total[i].getCost();
        return sum;
    }
}

/**
 * Created by danie on 9/29/2016.
 */
public class GroceryItemOrder {
    private String name;
    private int quantity;
    private double pricePerUnit;
    public GroceryItemOrder(String name, int quantity, double pricePerUnit){
        this.name = name;
        this.quantity =  quantity;
        this.pricePerUnit = pricePerUnit;
    }
    public double getCost(){
        return quantity * pricePerUnit;
    }
    public void setQuantity(int quantity){
        this.quantity = quantity;
    }
    public void setPricePerUnit(int cost){
        pricePerUnit = cost;
    }

}