Homework Soursepart 1 to 4 pleaseSolution The java program Lab5 that disp
part 1 to 4 please
Solution
/**
* The java program Lab5 that display a menu of chocies
* and prompts user to input for corresponding method
* and prints the results to console.
* */
//Lab5.java
import java.io.File;
import java.util.Scanner;
public class Lab5 {
//create an instance of static Scanner class
private static Scanner scanner=
new Scanner(System.in);
public static void main(String[] args) {
boolean repeat=true;
int choice = 0;
//calling menu method
menu();
//call getInput
choice=getInput();
while(repeat)
{
switch(choice)
{
case 1:
//calling getRichQuick
getRichQuick();
break;
case 2:
int x;
System.out.println(\"Enter an x:\");
x=Integer.parseInt(scanner.nextLine());
//calling eTaylor
System.out.printf(\"e^ %d = %2.16f \",x,eTaylor((double)x));
break;
case 3:
System.out.println(\"Enter name of text file : \");
String fileName=scanner.nextLine();
//calling getPalindromeCount
getPalindromeCount(fileName);
break;
case 4:
//calling menu
menu();
break;
case 0:
//exit the program
System.out.println(\"Thanks for participating! Goodbye.\");
System.exit(0);
}
menu();
choice=getInput();
}
}
//Takes string input and prints the number of palindrome words in
//text file
public static void getPalindromeCount(String fileName)
{
Scanner fileReader=null;
try
{
fileReader=new Scanner(new File(fileName));
String word;
int count=0;
while(fileReader.hasNextLine())
{
word=fileReader.nextLine();
if(isPalindrome(word))
count++;
}
fileReader.close();
System.out.printf(\"Number of palindrome words are %d \ \",count);
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
}
/**
* Method that returns true of the string ,str is palindrome
* otherwise returns false
* */
public static boolean isPalindrome(String str)
{
String reverse = new StringBuffer(str).reverse().toString();
if(str.equals(reverse))
return true;
else
return false;
}
/**
* The method prints the day and corresonding amount to console
* until amount is less than or equal to 1000000
* */
public static void getRichQuick()
{
double dollar=1;
int day=1;
final double TOTAL=1000000;
while(dollar<TOTAL)
{
System.out.printf(\"Day %d : $ %4.2f\ \",day,dollar);
dollar=dollar+(dollar/2.0);
day++;
}
System.out.printf(\"Day %d : $ %4.2f\ \",day,dollar);
}
//prints a menu of choices
public static void menu()
{
System.out.println(\"Welcome to Lab5!\");
System.out.println(\"Enter 1 to check how long it takes to get rich on a magic dollar coin.\");
System.out.println(\"Enter 2 to calculate e^x for any real x.\");
System.out.println(\"Enter 3 to find palindrome words in a text file.\");
System.out.println(\"Enter 4 to re-print the menu.\");
System.out.println(\"Enter 0 to exit.\");
}
//Takes a x value and prints the e^x
public static double eTaylor(double x)
{
double ACCURACY =10e-16;
int n=1;
double term=1,sum=1;
while (n <= 100)
{
term = term * x / n;
sum = sum + term;
if (term < ACCURACY)
n = 999;
else
n = n + 1;
}
return sum;
}
//Read input from user
public static int getInput()
{
System.out.println(\"What is your choice?\");
int choice=Integer.parseInt(scanner.nextLine());
return choice;
}
}
---------------------------------------------
sample input.txt
jasmin
madam
camel
Output:
Welcome to Lab5!
Enter 1 to check how long it takes to get rich on a magic dollar coin.
Enter 2 to calculate e^x for any real x.
Enter 3 to find palindrome words in a text file.
Enter 4 to re-print the menu.
Enter 0 to exit.
What is your choice?
1
Day 1 : $ 1.00
Day 2 : $ 1.50
Day 3 : $ 2.25
Day 4 : $ 3.38
Day 5 : $ 5.06
Day 6 : $ 7.59
Day 7 : $ 11.39
Day 8 : $ 17.09
Day 9 : $ 25.63
Day 10 : $ 38.44
Day 11 : $ 57.67
Day 12 : $ 86.50
Day 13 : $ 129.75
Day 14 : $ 194.62
Day 15 : $ 291.93
Day 16 : $ 437.89
Day 17 : $ 656.84
Day 18 : $ 985.26
Day 19 : $ 1477.89
Day 20 : $ 2216.84
Day 21 : $ 3325.26
Day 22 : $ 4987.89
Day 23 : $ 7481.83
Day 24 : $ 11222.74
Day 25 : $ 16834.11
Day 26 : $ 25251.17
Day 27 : $ 37876.75
Day 28 : $ 56815.13
Day 29 : $ 85222.69
Day 30 : $ 127834.04
Day 31 : $ 191751.06
Day 32 : $ 287626.59
Day 33 : $ 431439.88
Day 34 : $ 647159.82
Day 35 : $ 970739.74
Day 36 : $ 1456109.61
Welcome to Lab5!
Enter 1 to check how long it takes to get rich on a magic dollar coin.
Enter 2 to calculate e^x for any real x.
Enter 3 to find palindrome words in a text file.
Enter 4 to re-print the menu.
Enter 0 to exit.
What is your choice?
2
Enter an x:
1
e^ 1 = 2.7182818284590455 Welcome to Lab5!
Enter 1 to check how long it takes to get rich on a magic dollar coin.
Enter 2 to calculate e^x for any real x.
Enter 3 to find palindrome words in a text file.
Enter 4 to re-print the menu.
Enter 0 to exit.
What is your choice?
3
Enter name of text file :
input.txt
Number of palindrome words are 1
Welcome to Lab5!
Enter 1 to check how long it takes to get rich on a magic dollar coin.
Enter 2 to calculate e^x for any real x.
Enter 3 to find palindrome words in a text file.
Enter 4 to re-print the menu.
Enter 0 to exit.
What is your choice?
