Assignment 10

package assignment_9_muratore;

import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.util.Scanner;

public class Problems {

 // CHP 14 EX 3
 public static void division()
 {
  Scanner stdIn = new Scanner(System.in);
  int n, d, q;
  System.out.println("Enter numerator: ");
  n = stdIn.nextInt();
  System.out.println("Enter divisor: ");
  d = stdIn.nextInt();
  try {
  q = n / d;
  System.out.println(q);
  }
  catch (ArithmeticException e)
  {
   System.out.println("Error, but keep going anyway.");
  }
  stdIn.close();
 }
 
 // CHP 14 EX 4
 public static void division2()
 {
  Scanner stdIn = new Scanner(System.in);
  
  double n = 0;
  int d = 0;
  boolean OK = false;
  
  while (OK == false) {
   
   try {
    System.out.print("Enter numerator: ");
    n = stdIn.nextDouble();
    while (d == 0) {
     System.out.print("Enter divisor: ");
     d = stdIn.nextInt();
     if (d == 0) 
      System.out.println("Can not divide by 0.");
    }
    OK = true;
   }
   catch (InputMismatchException e)
   {
    System.out.println("Invalid input.. try again");
    d = 0;
    n = 0;
    OK = false;
    // required to discard data
    stdIn.next();
   }
   
  }
  

  System.out.println(n / d);
  stdIn.close();
 }
 
 // CHP 15 EX 3
 public static void testWriter()
 {
   String[] churchill = 
    {"Before Alamein we never had a victory.",
     "After Alamein we never had a defeat."};
   PrintWriter fileOut;
   try
   {
    // Append is false to start
    fileOut = new PrintWriter("elAlamein.txt");
    for (String line : churchill)
    {
     fileOut.println(line);
    }
    fileOut.close();
   }
   catch (FileNotFoundException e)
   {
    System.out.println(e.getMessage());
    
   }
 
 }
 
 // CHP 15 EX 4
 public static void appendWriter()
 {
  FileWriter fileOut;
  int year = 1942;
  try
  {
   fileOut = new FileWriter("elAlamein.txt", true);
   fileOut.write("Year " + Integer.toString(year));
   fileOut.close();
  }
  catch (IOException e)
  {
   System.out.println(e.getMessage());
  }

 }
 

 public static void main(String[] args) {
  
  System.out.println("Running Division");
  division();
  System.out.println("Running Division2");
  division2();
  System.out.println("Running testWriter");
  testWriter();
  System.out.println("Running testAppend");
  appendWriter();
  
 }

}