Answer Happy

JAVA Can somone help with parts 4, 5, 6, 7
import java.util.Scanner;
public class ArrayDemos
{
public static void main(String[] args)
{ System.out.print("\f");
//* ----------------- Problem 1
----------------------
System.out.println("\nP1");
// a) Declare an array of int called
count, that holds 5 int values
int [] count;
count = new int[4];
// b) Now assign the values 1, 5, 2, 9
and to the four elements of your array using index [0]
through [4]:
count[0] = 1;
count[1] = 5;
count[2] = 2;
count[3] = 9;

// c) Print count array using the while
loop illustrated at the bottom of section 12.1 of the
text.
int i = 0;
while (i < 4)
{
System.out.println(count + "
");
i++;
}
System.out.println();
// d) Change the values using some of
the techniques illustrated at the top in section 12.1.
count[0] = 7;
count[1] = count[0]*2;
count[2]++;
count[3]-=60;

// e) Print the count array a second
time to observe the changes made.
i = 0;
while (i < 4)
{
System.out.println(count + "
");
i++;
}


//
-----------------------------------*/

System.out.println("\nP2");
// a) Make a copy of your count array
called "copy" using the approach shown at top of sec12.2
//int [] copy = count;

// b) change the value of copy[0], then
print the count array a third time and observe the changes
//count[0] = 99;

// c) Make your copy array truly be an
independent copy using the approach shown at bottom of
sec12.2
int [] copy = new int[4];
i = 0;
while (i < 4)
{
copy = count;
i++;
}

copy[0] = 99;
System.out.println("Here's count");
i = 0;
while (i < 4)
{
System.out.println(count + "
");
i++;
}
System.out.println();

System.out.println("Here's copy");
i = 0;
while (i < 4)
{
System.out.println(count + "
");
i++;
}
System.out.println();
//
-----------------------------------*/


System.out.println("\nP3");

// Print the count array using a
for-loop as illustrated in section 12.4 and 12.5
for ( i = 0; i < count.length; i++) {
System.out.println(count);
}
System.out.println();




/* ------------problem 4
---------*/
System.out.println("\nP4");

// Generate an array "die100" with 100
throws of a die (from 1 to 6).
// how to generate the random numbers.
// 0) create an int array called die100 with
a size of 100 items
// 1) modify the for method with the following
formula (int) (x*6) + 1;
for ( i = 0; i < 10; i++){
double x = Math.random();
System.out.println(x);
}

// 2) once 1) works, Modiy the loop to
assign the value being printed
// to index i in the die100 array (make
the loop go up to 100)
// also, define a printArray method
below main to print your int array.
System.out.println("die100 contains the
values: ");
// printArray(die100);

// also, define a printArray method
below main to print your int array.
System.out.println("die100 contains the
values: ");
// printArray(die100);

//
-----------------------------------*/
/* ----------------- Problem 5
----------------------
System.out.println("\nP5");
// Define a method count5(int [] arr)
below main that returns the count of the number of
// times a 5 is found in the
array.

System.out.println("The number 5
appeared " + count5(die100) + " in the die100 array");



//
-----------------------------------*/
//* ----------------- Problem 6
----------------------
System.out.println("\nP6");
// Define an int array counts that has
7 elements in it.
// Follow the insructions in section
12.10 to create a histogram of the values in die100 stored
// in the array counts. Then print your
counts array from 1 to 6 and check if it represents the
// true count of values in die100 (at
least you can check if the count of 5's is the same as
// is count5 produces - there should be
around 16 5's more or less).



System.out.println("The histogram of
die100 is ");
// printArray(counts); // in
viewing the results, are the numbers evenly distributed?


// EXTRA CREDIT: display your results
as a bar chart like the one shown in slide 42 (and 43)


//
-----------------------------------*/
/* ----------------- Problem 7
----------------------
System.out.println("\nP7");
// Generate an array called "arr10"
with 10 random values between 0 and 99

System.out.println("arr10 contains the
values: ");
printArray(arr10);

// Define a method maxValue that
returns the largest number in an array
System.out.println("the largest value
in arr10 is " + maxValue(arr10);


//
-----------------------------------*/
/* ----------------- Problem 8 EXTRA
CREDIT ----------------------
System.out.println("\nP8");
// Develop a bubbleSort method
following the example slides 44-63 and use it
// to sort your arr10 array from
problem 6

bubbleSort(arr10);
System.out.println("after sorting
arr10, we have: ");
printArray(arr10);


//
-----------------------------------*/

} // end of main
public static int count5(int [] arr)
{
int counter = 0;
for (int i=0; i < arr.length;
i++)
{

}
return counter;
}
}