Hello,
Could you please input validate this code so that the code prints an error message if the user enters in floating point numbers or characters or ANYTHING but VALID ints? And then could you please post a picture of the output testing it to make sure it works?
* Write a method called evenNumbers that accepts a Scanner * reading input from a file with a series of integers, and * report various statistics about the integers to the console. * Report the total number of numbers, the sum of the numbers, * the count of even numbers and the percent of even numbers. * For example, if the input file contains the following text: * * 5 7 2 8 9 10 12 98 7 14 20 22 * * Then the method should produce the following console output: * * 12 numbers, sum = 214 * 8 evens (66.67%) * */ import java.util.*; import java.io.*; public class Chap6Ex02{ public static void main (String[] args) throws FileNotFoundException{ Scanner input = new Scanner(new File("integers.txt")); evenNumbers(input); } public static void evenNumbers( Scanner inp){ int count = 0; int sum = 0; int evens = 0; while(inp.hasNextInt()){ int num = inp.nextInt(); count++; sum += num; if (num % 2 == 0){ evens++; } } double percent = evens/count * 100; System.out.println(count + " numbers, sum = " + sum); System.out.println(evens + " evens (" + percent + "%)"); } }
Program:
import java.util.*;
import java.io.*;
public class Chap6Ex02{
public static void main (String[] args) throws FileNotFoundException{
Scanner input = new Scanner(new File("integers.txt"));
evenNumbers(input);
}
public static void evenNumbers(Scanner inp){
int count = 0;
int sum = 0;
int evens = 0;
boolean isValid = true;
//run a loop until end of file is reached
while(inp.hasNext())
{
//check is the value encountered is an integer or not, if integer proceed else print error message
if(inp.hasNextInt())
{
//read the integer
int num = inp.nextInt();
//increment the count numbers read
count++;
//add the integer to sum
sum += num;
//check if integer is even, if even increment count of evens
if (num % 2 == 0){
evens++;
}
}
//if an invalid value is encountered in the file
else
{
//display error message and terminate the loop
System.out.println("Error: Invalid values in input file.");
isValid = false;
break;
}
}
//display results only if all the values are valid
if(isValid)
{
double percent = (double)(evens)/(double)(count) * 100;
System.out.println(count + " numbers, sum = " + sum);
System.out.printf("%d evens (%.2f%%)", evens, percent);
//System.out.println(evens + " evens (" + percent + "%)");
}
}
}
Output:
Output when valid input is used
Output when invalid input is entered
Program screenshot:
Hello, Could you please input validate this code so that the code prints an error message...
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