Question

Write a simple polling program that allows users to rate 5 issues from 1 (low importance) to 10 (high importance). Use a one dimensional array of type String to store the five causes. Prompt for the number to be polled. Use a 5X(numPolled) int array to store the results of the survey,

but please prompt for the file name. When you run the program ask a user rate each issue. The five issues are Environment, War and Peace, Economy, Education, and Infrastructure. Read in the five causes from a file Repeat this process for tnumPolled users. If a user gives an out of range keep prompting the user until the user answers the question correctly.

Write the following outputs to a file (prompt for the name). Include the following:

1. A tabular report with 5 topics down the left side and the results of the ratings for the numPolled users on the line as shown in the text file.
2. To the right of each row show the average of the results to two decimal places.
3. Determine which issue received the highest poll total and write out that cause and it’s poll average.
4. Determine which issue received the highest poll total and write out that cause and it’s poll average.

Implementation Guidance.

You should implement the above program with the following methods:

main

Create a String array of causes called causesList..

Calls readCauses with no parameters, which returns a reference to a String array.

Requests number (numPolled) to be polled interactively.

Call performSurvey with the causesList and numPolled as parameters. This method returns a reference to a two dimensional int array with the pollResults. (Can call it pollResults in main)

Call calcCausesSums with pollResults as a parameter. Return a reference to a one-dimensional int array with the sums by row.(Can call it causesSum in main

Call calcAverage with reference to causesSum and the value of numPolled as parameters, returning a reference to a one-dimensional double array. (Can call it averageForCause)

Call reportResults with causesList, pollResults, averageForCause, causesSum references as parameters, and no return value.

readCauses with no parameters

readCauses sets up a Scanner and reads from a file the causes. The file format is one cause per line. You can hardcode in the number of causes as 5 causes for this example. Return a reference to a String array with the causes. You can use my causes.txt file.

performSurvey with the causesList reference and numPolled as parameters

Interactively request the importance for each pollee. Put the answers into a two dimensional int array and return a reference to it. Reject and request a new value for any value less than 1 or greater than 10See below for the possible format for the interactive questioning.

calcCausesSums with pollResults reference as parameter

Calculate the total for each row (cause) and return results in a one-dimensional int array.

calcAverage with causesSum reference and the value of numPolled as parameters

Calculate the average for each row and return a reference to a one dimensional array.

reportResults with causesList, pollResults, averageForCause, causesSum references as parameters

Interactively request an output file name, and create an output File and use PrintWriter to write to it.

Produce the output similar to that in my pollresults.txt file. The average must be printed to two decimal places.

Call findMaxCause with a reference to average as a parameter, returning an int of the array index with the highest average or the first with that average if all are the same.

Call findMinCause with a reference to average as a parameter, returning an int of the array index with the lowest average or the first with that average if all are the same.

Write out the last two lines to your file as shown in the pollresults.txt file.

findMaxCause and findMinCause each accept a reference to average and return the index as described above.

Output:

Polling Results

Cause           Polled Person    Average

                          1 2 3 4

Environment     5 10 1 1        4.25

War and Peace 6 9 10 7        8.00

Economy           7 4 5 9        6.25

Education         8 7 8 3        6.50

Infrastructure    3 7 3 10        5.75

The cause War and Peace with an average rating of 8.00 is the highest rated cause

The cause Environment with an average rating of 4.25 is the lowest rated cause

Answer 1

Dear Student,

Here is the code for your program.

CODE TO COPY -----

import java.nio.charset.StandardCharsets;

import java.io.*;

import java.util.*;

public class Polling{

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

String [] causeList = new String[5];

causeList = readCauses();

System.out.println("Enter number of polls");

int numpoll = in.nextInt();

int [][] pollResults = new int[5][numpoll];

pollResults = performSurvey(causeList,numpoll);

int[] causesSum = calcCausesSums(pollResults);

double[] averageForCause = calcAverage(causesSum,numpoll);

reportResults(causeList, pollResults, averageForCause);

}

public static String[] readCauses(){

String[] causes = new String[5];

int i=0;

try {

Scanner scanner = new Scanner(new File("causes.txt"));

// Read lines from the file

while(scanner.hasNextLine()) {

causes[i]=scanner.nextLine();

i++;

}

scanner.close();

}

catch (FileNotFoundException e) {

e.printStackTrace();

}

return causes;

}

public static int[][] performSurvey(String[] causes, int num){

Scanner in = new Scanner(System.in);

int[][] results = new int[5][num];

for (int j=0;j<num;j++){

System.out.println("Enter ratings for importance\nPoll "+ (j+1));

for(int i=0;i<5;i++){

System.out.print(causes[i]+" ");

int value = in.nextInt();

if(value>0 && value <=10)

results[i][j]=value;

else{

System.out.println("Invalid rating. Please try again");

i--;

continue;

}

}

}

return results;

}

public static int[] calcCausesSums(int [][] results){

int col = results[0].length;

int[] sum= new int[5];

for(int i=0;i<5;i++){

for(int j=0;j<col;j++){

sum[i]+=results[i][j];

}

}

return sum;

}

public static double[] calcAverage(int [] sum,int num){

double[] avg= new double[5];

for(int i=0;i<5;i++){

avg[i]=sum[i]/num;

}

return avg;

}

public static void reportResults(String[] causes, int [][]results, double[] average)

{

int col = results[0].length;

System.out.println("Enter filename to save output with extension .txt");

Scanner in = new Scanner(System.in);

String filename = in.next();

File file = null;

try {

file = new File(filename);

/*If file gets created then the createNewFile()

* method would return true or if the file is

* already present it would return false

*/

boolean fvar = file.createNewFile();

if (fvar){

System.out.println("File has been created successfully");

}

else{

System.out.println("File already present at the specified location");

}

} catch (IOException e) {

System.out.println("Exception Occurred:");

e.printStackTrace();

}

  

// write data to file

try (PrintWriter out = new PrintWriter(file, StandardCharsets.UTF_8.name())) {

out.print("Polling Results\n");

out.print("Causes\tPolled Person\tAverage\n");

out.print("\t\t\t\t");

for(int i=0;i<col;i++)

out.print((i+1)+" ");

out.print("\n");

for(int i=0;i<5;i++){

out.print(causes[i]+"\t\t");

for (int j = 0;j<col;j++){

out.print(results[i][j]+"\t");

}

out.print(average[i]+"\n");

}

  

int min = findMinCause(average);

int max =findMaxCause(average);

  

String maxsentence = " The " + causes[max] + " with an average rating of " +average[max]+" is the highest rated cause";

String minsentence = " The " + causes[min] + " with an average rating of " +average[min]+" is the lowest rated cause";

out.print("\n"+maxsentence+"\n"+minsentence);

System.out.println("Successfully written data to the file");

} catch (IOException e) {

e.printStackTrace();

}

}

public static int findMaxCause(double[] average){

int index = 0;

double max=0;

for(int i=0;i<5;i++)

if(average[i]>max){

max=average[i];

index=i;

}

return index;

}

public static int findMinCause(double[] average){

int index = 0;

double min=average[0];

for(int i=0;i<5;i++)

if(average[i]<min){

min=average[i];

index=i;

}

return index;

}

}

-------

OUTPUT:

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