Question

Write a program that reads a file containing an arbitrary number of text integers that are in the range 0 to 99 and counts how many fall into each of eleven ranges. The ranges are 0-9, 10-19, 20-29,..., 90-99 and an eleventh range for "out of range." Each range will correspond to a cell of an array of ints. Find the correct cell for each input integer using integer division. After reading in the file and counting the integers, write out a histogram that shows the range of each bin, the number of integers that fell into that bin, and a horizontal row of stars that shows the number in each bin. Put a space after every ten stars. range count 0-9 10-19 20-29 30-39 35 24 13 * 8 90-99 15 Total count: 267 Assume that there will be no more than 50 integers in each category. If a category has more than that, just write out 50 stars. (A better program would automatically adjust how many integers each star represents depending on the data.) Ask the user for the name of the input file and create a Scanner to read the file. A hard-coded file name is not acceptable. Listing 5.10 on p. 227 of the text will be useful. You will need methods hasNextInt () and nextInt ) from class Scanner. Your program should use a try block to deal with creating the Scanner. Use a catch block to catch a FileNotFoundException. Write an appropriate error message if the file is not found and return to the caller. The input file contains an arbitrary number of text integers and no other characters but white space: 23 45 91 105 1 0 23 78 84 45 1 52 57 93 -1 4 56 99 23

Answer 1

CODE:-

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

public class Histogram {

  

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

  

Scanner input = new Scanner(System.in);

System.out.print("Enter filename: ");

String fileName = input.next();

  

// opening file

Scanner sc = new Scanner(new File(fileName));

  

int countArr[] = new int[11];

  

int num;

  

while(sc.hasNextInt()){

  

num = sc.nextInt();

  

if(num >=0 && num <=9)

countArr[0]++;

else if(num>=10 && num <=19)

countArr[1]++;

else if(num>=20 && num <=29)

countArr[2]++;

else if(num>=30 && num <=39)

countArr[3]++;

else if(num>=40 && num <=49)

countArr[4]++;

else if(num>=50 && num <=59)

countArr[5]++;

else if(num>=60 && num <=69)

countArr[6]++;

else if(num>=70 && num <=79)

countArr[7]++;

else if(num>=80 && num <=89)

countArr[8]++;

else if(num>=90 && num <=99)

countArr[9]++;

else // out of range

countArr[10]++;

}

  

sc.close();

input.close();

  

int low = 0, high = 9;

  

System.out.println("range\t\tcount");

for(int i=0; i<10; i++){

System.out.print(low+"-"+high+"\t\t"+countArr[i]+" |");

for(int j=1; j<=countArr[i]; j++)

System.out.print("*");

System.out.println();

low = low+10;

high = high + 10;

}

System.out.print("out of range\t"+countArr[10]+" |");

for(int j=1; j<=countArr[10]; j++)

System.out.print("*");

System.out.println();

}

}

/*

Sample run:

Enter filename: input.txt

range count

0-9 3 |***

10-19 1 |*

20-29 4 |****

30-39 2 |**

40-49 0 |

50-59 0 |

60-69 1 |*

70-79 3 |***

80-89 0 |

90-99 2 |**

out of range 9 |*********

*/

############# input.txt ########

31 145 70 5 27 103 71 140 8 162 98 153 8 109 103 31 145 157 27 90 75 19 23 25 69