Question

JAVA

There is a theory that the being taller is an advantage in a U.S. presidential election. It contains a text file with a list of all presidents and their heights, and also a starter program. The entries in the presidents_by_height.txt file have this format:

Abraham Lincoln 6 ft 4 in 193 cm
Lyndon B. Johnson 6 ft 3.5 in 192 cm
Create a project with the files and complete the PresidentAverageHeight class to find the average height in centimeters of all US presidents to date (or 0 if the file is empty). Print with 2 decimal places.

You will use nextLine, split, and Integer.parseInt()

*****************presidents_by_height*******************

Abraham Lincoln 6 ft 4 in 193 cm
Lyndon B. Johnson 6 ft 3.5 in 192 cm
Donald Trump 6 ft 3 in 191 cm
Thomas Jefferson 6 ft 2.5 in 189 cm
George Washington 6 ft 2 in 188 cm
Chester A. Arthur 6 ft 2 in 188 cm
Franklin D. Roosevelt 6 ft 2 in 188 cm
George H. W. Bush 6 ft 2 in 188 cm
Bill Clinton 6 ft 2 in 188 cm
Andrew Jackson 6 ft 1 in 185 cm
Ronald Reagan 6 ft 1 in 185 cm
Barack Obama 6 ft 1 in 185 cm
James Monroe 6 ft 0 in 183 cm
John Tyler 6 ft 0 in 183 cm
James Buchanan 6 ft 0 in 183 cm
James A. Garfield 6 ft 0 in 183 cm
Warren G. Harding 6 ft 0 in 183 cm
John F. Kennedy 6 ft 0 in 183 cm
Gerald Ford 6 ft 0 in 183 cm
William Howard Taft 5 ft 11.5 in 182 cm
Herbert Hoover 5 ft 11.5 in 182 cm
George W. Bush 5 ft 11.5 in 182 cm
Grover Cleveland 5 ft 11 in 180 cm
Richard Nixon 5 ft 11 in 180 cm
Woodrow Wilson 5 ft 11 in 180 cm
Dwight D. Eisenhower 5 ft 10.5 in 179 cm
Franklin Pierce 5 ft 10 in 178 cm
Andrew Johnson 5 ft 10 in 178 cm
Theodore Roosevelt 5 ft 10 in 178 cm
Calvin Coolidge 5 ft 10 in 178 cm
Jimmy Carter 5 ft 9.5 in 177 cm
Millard Fillmore 5 ft 9 in 175 cm
Harry S. Truman 5 ft 9 in 175 cm
Rutherford B. Hayes 5 ft 8.5 in 174 cm
William Henry Harrison 5 ft 8 in 173 cm
James K. Polk 5 ft 8 in 173 cm
Zachary Taylor 5 ft 8 in 173 cm
Ulysses S. Grant 5 ft 8 in 173 cm
John Quincy Adams 5 ft 7.5 in 171 cm
John Adams 5 ft 7 in 170 cm
William McKinley 5 ft 7 in 170 cm
Benjamin Harrison 5 ft 6 in 168 cm
Martin Van Buren 5 ft 6 in 168 cm
James Madison 5 ft 4 in 163 cm

***************************************************************
JAVA Program to work on:

**************presidentAverageHeight********************

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class PresidentAverageHeight
{
public static void main(String[] args) throws FileNotFoundException
{
File inputFile = new File("presidents_by_height.txt");
Scanner in = new Scanner(inputFile, "UTF-8");
double total = 0;
int count = 0;
while (in.hasNextLine())
{
String line = in.nextLine();
//Use split

}
  
//compute the average
in.close();
}
}

*********************************************************

Thumbs up will be given to the correct answer. Please don't look on another chegg answer elsewhere, as I found it to be wrong.

Answer 1

If you have any doubts, please give me comment...

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

public class PresidentAverageHeight {

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

File inputFile = new File("presidents_by_height.txt");

Scanner in = new Scanner(inputFile, "UTF-8");

double total = 0;

int count = 0;

double average;

while (in.hasNextLine()) {

String line = in.nextLine();

// Use split

String cols[] = line.split(" ");

//7th indicates height in cm

total += Integer.parseInt(cols[6]);

count++;

}

// compute the average

if(count==0){

average = 0;

}

else{

average = total / count;

}

System.out.printf("Average %.2f\n", average);

in.close();

}

}