/* Ryan Long

* CS 1450 001 - Data Structures and Algorithms - Fall 2018

* This program generates and displays an array of 25 random numbers ranged 0 - 99,

* calculates the sum, average, median, and mode of the array, then sorts the array

* from lowest to highest and outputs the result to a file in the current directory.

* The file is then read and displayed by the program.

*/

import java.util.Arrays;

import java.io.FileNotFoundException;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

class assignment1{

// Code begins

public static void main(String[] args) throws FileNotFoundException, Exception {

//Prints random array

int[] array = new int[25];

print(array);

//Sums the array

System.out.println("\nSum = " + sum(array));

//Averages the array

System.out.println("Average = " + average(array));

// Calculates median of array

System.out.println("Median = " + median(array));

//Calculates mode of array

System.out.println("Mode value = " + mode(array));

//Outputs the array to assignment1.txt in current directory

write(array);

// Reads data from assignment1.txt in current directory

read(array);

}// end main

// Prints randomly generated array

public static void print (int[] array) {

System.out.println("Random values stored in an array");

for(int i = 0; i < array.length; i++) {

array[i] = (int)(Math.random()*100);

System.out.println(array[i]);

}

}

// Calculates total sum of array

public static int sum (int[] array) {

int sum = 0;

for (int element: array) {

sum = sum + element;

}

return sum;

}

// Calculates average of array

public static double average(int[] array) {

double average = 0;

average = (sum(array) / 25.0);

return average;

}

// Calculates median of array

public static int median(int[] array) {

Arrays.sort(array);

int median = 0;

if ((array.length & 1) == 0 ) {

median = (array[(25/2)] + array[(25/2)]) / 2; // Averages the 2 middle integers

} else {

median = array[25/2]; // Uses middle integer

}

return median;

}

// Calculates mode of array

public static String mode (int[] array) {

int element = 0;

int count = 0;

for (int i = 0; i < array.length; i++) {

int tempElement = array[i];

int tempCount = 0;

for(int j = 0; j < array.length; j++)

if(array[j] == tempElement)

tempCount++;

if (tempCount > count){

element = tempElement;

count = tempCount;

}

}

return (element + " which occured " + count + " times");

}

// Sorts and outputs the array integers from lowest to highest

public static int[] write (int[] array) throws FileNotFoundException{

java.io.File file = new java.io.File("assignment1.txt");

java.io.PrintWriter output = new java.io.PrintWriter(file);

int[] newArray = new int[25];

int i;

for (i = 0; i < 25; i++){

newArray [i] = array [i];

Arrays.sort(array);

output.println(array[i]);

}

output.close();

return newArray;

}

// Reads data from assignment1.txt in current directory

public static int[] read (int[] array) throws IOException{

FileReader file = new FileReader("assignment1.txt");

BufferedReader reader = new BufferedReader(file);

String text = "\nRandom values stored in file in increasing order";

String line = reader.readLine();

while(line != null) {

text += "\n" + line;

line = reader.readLine();

} reader.close();

System.out.println(text);

return array;

}

}//class