PROJECT 3: Array of integers

Click to enlarge.

Create an integer array named "z"
containing at least twenty (20) integer values.

Display the contents of the array,

Also display sum total & mean average

When a button or key is pressed
modify the array (as described below).

Write a (void) function to display the contents of the array, one element per line.
Compute and display the sum total and the mean average of all elements in the array.
Write functions to modify or manipulate ANY array of integers, performing operations as described in the table below.
Add buttons as indicated below; add code to mousePressed() to call each function when the corresponding button is clicked.

int many=20;
int[] z = new int[many];
float total, average;

Your draw() function should look something like this:

void draw( ) { background( 200,255,200 ); scene(); // Show the buttons. display( z, many ); // Show the array. messages(); // Title, author, average }

Everything else is done by "closed" functions that are called when a key or button is pressed.

Each function should accept two arguments:

an array of integers
the size of the array.

NOTE: Do not use global variables to refer to the array and size, in these "closed" functions. Instead, use the arguments, as in the following examples:

Here is an example of a function that displays an array:

// Display a list of array values void display( int[] v, int m ) { int x=50, y=60, spacing=15; textSize( 12 ); for (int i=0; i<m; i=i+1) { text( v[i], x, y ); y = y + spacing; } }

This function returns the sum of the elements:

// Compute the sum. float sum( int[] w, int m ) { float result=0; for (int j=0; j<m; ++j) { result += w[j]; } return result; }

These functions are called

when a key is pressed, OR . . .

when a button is clicked.

Action Key Button

void reset( int a[], int m )
// Fill the array with random values
// from zero to 999. r RESET

void calc( int a[], int m )
// Calculate new total and average. c CALC

void next( int a[], int m )
// Increase each of the numbers by one. n NEXT

void dbl( int a[], int m )
// Double each of the numbers. d DOUBLE

void half( int a[], int m )
// Reduce each by half. h HALF

void big( int a[], int m )
// Move biggest number to end of the array.
// (Swap elements, to preserve all numbers.) b BIG

void order( int a[], int m )
// For extra credit, rearrange (sort) the entire array (in ascending order).
NOTE: Do not use the name "sort for this function. (That is a reserved word, in Processing!) o ORDER

void var( int a[], int m )
// For extra credit, compute the variance and standard-deviation. v SIGMA

NOTE: Do not use global values in these functions; use the arguments.

KEYS The keyPressed() function should have code to call a function when the key is the first letter of that function.

    r	reset()		// Replace with random values.
    c	calc()		// Calculate new sum and average.

    n	next()		// Increase each by one.
    d	dbl()		// Double each of the numbers.
    h	half()		// Reduce each by half.
    b	big()		// Move biggest to end of array.
    o	order()		// Rearrange array in ascending order. (sort)

BUTTONS

create buttons with names for each of these,
and add mousePressed() code to call these functions when button is pressed.