I'm reading a file with numbers checking if the number is a prime number then writing next to the prime numbers "is a prime" and printing that out to a different file, I keep getting:
Failed to open file in4.txt Exiting...
This is my code:
import java.util.Scanner;
import java.util.ArrayList;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
public class CheckPrimes {
public static void checkPrimes(String in_file, String out_file) {
File temp = new File(in_file);
Scanner input;
try
{
input = new Scanner(temp);
}
catch (Exception e)
{
System.out.printf("Failed to open file %s\n", in_file);
return;
}
while (true)
{
for (int i = 2; i < input.nextInt(); i++)
{
if (input.nextInt() % i != 0)
{
try{
PrintWriter output = new PrintWriter(out_file);
output.print( input.nextInt() + " is prime");
output.close();
}
catch(IOException ex)
{
System.out.printf("Error : %s\n",ex);
}
}
}
}
{
public static void main(String[] args)
{
checkPrimes("in4.txt", "out4.txt");
System.out.printf("Exiting...\n");
}
}