Authors:
Walter Savitch ,kenrick Mock
Chapter:
File Io
Exercise:
Programming Projects
Question:2 | ISBN:9780132830317 | Edition: 5
Question
Write a program that will search a text file of strings representing numbers of type int and will write the largest and the smallest numbers to the screen. The file contains nothing but strings representing numbers of type int , one per line.
Answer
import java.util.*;
import java.io.*;
public class SearchNumbers
{
public static void main(String args[])
{
int maxNum,minNum;
int nextSearch;
Scanner inputFile = null;
try
{
inputFile = new Scanner(new FileInputStream("numbersFile.txt"));
}
catch(FileNotFoundException e)
{
System.out.println("Sorry, this file could not not be found.");
}
maxNum = inputFile.nextInt();
minNum = maxNum;
while(inputFile.hasNextInt())
{
nextSearch= inputFile.nextInt();
if(minNum > nextSearch)
minNum = nextSearch;
if(maxNum < nextSearch)
maxNum = nextSearch;
}
System.out.println("Smallest number in the file: " + minNum);
System.out.println("Largest number in the file: " + maxNum);
}
}
Input data in numbersFile.txt:
100
70
50
11
94
30
4
8
6
99
4
OUTPUT:
Smallest number in the file: 4
Largest number in the file: 100