Write a java program that allows the user to input the name of a fil.docx

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The document describes a Java program that takes in a file containing positive integers, reads the integers, separates the even and odd numbers, and writes them to separate text files. The program prompts the user to enter the file name and number of integers, then uses loops and conditionals to read each integer, check if it is even or odd, and write it to the corresponding file. On completion, it notifies the user that the files were successfully written.

Write a java program that allows the user to input the name of
a file that contains positive integers (one integer per line) The
number of integers in the file The program should find all odd
and even numbers and write the odd numbers to a file
"odd.txt" and write the even numbers to another file
"even.txt"
Solution
package expertques;
import java.io.File;
import java.io.PrintWriter;
import java.util.Scanner;
public class evenoddwithfile {
public static void main(String[] args) throws Exception {
File in;//file input
File even = new File("f://even.txt");//creates file even
File odd = new File("f://odd.txt");//creates file odd
Scanner s = new Scanner(System.in);//reads input from console
or user
System.out.println("Enter the file name with path: ");
in = new File(s.nextLine());
System.out.println("Enter the number of integers n the file:
");

int n = s.nextInt();
if (in.exists()) {//checks if input file exist or not
Scanner ins = new Scanner(in);//reads input file
PrintWriter pe = new PrintWriter(even);//write to even file
PrintWriter po = new PrintWriter(odd);//writes to odd file
for (int i = 0; i < n; i++) {//loop till the numbers exists
int x = ins.nextInt();//reads from input file
if (x % 2 == 0) {//checks for even or odd
pe.println(x);//if even writes in even file
} else {
po.println(x);//if odd writes in odd file
}
}
pe.close();//closes even file very important else nothing will be
written in the file
po.close();//closes odd file very important else nothing will be
written in the file
System.out.println("File successfully written with odds and
evens");
} else {
System.out.println("Error file not found at specified
path");//if file not exist
}
}

}
output
run:
Enter the file name with path:
f://integers.txt
Enter the number of integers n the file:
8
File successfully written with odds and evens
BUILD SUCCESSFUL (total time: 6 seconds)

Given 8 distinct integers from the set {1, 2, . . . , 16}, prove that there exists k such that ai aj = k has at least 3 distinct solutions (ai , aj ) ? Solution For any k (unless the K is zero), at least 3 distinct solutions need not be existing. Let\'s look at the next most favourable case If k= 2; We have to consider the case where the number of solutions of ai-aj=2 are minimum since we have to show that at least 3 distinct solutions exist (which means even in the most unfavourable case for a chosen k there will be 3 distinct solutions satisfying the equation ai-aj=2) If k = 2; we start by taking numbers that are not at all 2 units apart from each other; So we start with 1 and move 3 units successively ahead 1, 4, 7, 10,13, 16; Now we notice that these 6 numbers are of 3k+1 form; remaining numbers can be any 2 ranomdly selected say 2 and 11; we get 4-2 = 2 and 13-11=2; Hence only 2 distinct solutions are possible..

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