import java.util.Scanner;
/***
*
* @author Rilind Asllani
* Spring 2020
* Information Systems 4415-090
* Homework 1
* 1/15/2020
*/
public class homeworkOne
{
public static void main(String[] args)
{
//Remove commment lines to run specific method.

//celsiusToFahrenheit();
//calculateTips();
//sumOfTheDigits();
//compoundValue();
//futureInvestmentValue();

}
/**
* Homework Problem 2.1
* Convert Celsius to Fahrenheit
* Celsius written using double value then converting with formula to fahrenheit.
*/
public static void celsiusToFahrenheit()
{
Scanner input = new Scanner(System.in); //Reads the console input.
double celsius; // Variable set for celius.
double Fahrenheit; // Variable set of Fahrenheit.

System.out.print("Enter a degree in Celsius: "); //asking for Celsius

celsius = input.nextDouble(); //reads the input and sets it equal to variable celsius.
Fahrenheit = (9.0/5.0) * celsius + 32; // calculates the fahrenheit and sets it equal to variable fahrenheit.

System.out.println(celsius + " Celsius is "+ Fahrenheit + " Fahrenheit."); //prints line with the fahrenheit given some celsius.
}
/**
* Homework Problem 2.5
* Calculate the tip.
*/
public static void calculateTips()
{
// Scanner variable and double variables.
Scanner input = new Scanner(System.in);
Double subtotal, gratuity;

//Console prompt for two doubles to be used in calculations.
System.out.print("Enter the subtotal and a gratuity rate: ");

//Setting the two double values to the variables.
subtotal = input.nextDouble();
gratuity = input.nextDouble();

//calculating the gratuity.
gratuity = gratuity/100 * subtotal;

//calculating the total
subtotal = gratuity + subtotal;

//printing out the total
System.out.println("The gratuity is $" + gratuity + " and the total is $" + subtotal);

}
/**
* Homework Problem 2.6
* Sum of the digits between 0 and 1000 not inclusive.
*/
public static void sumOfTheDigits()
{
//asking for a number between 0-1000
System.out.print("Enter a number between 0 and 1000: ");

//Scanner and setting variable number equal to next int.
Scanner input = new Scanner(System.in);
int number = input.nextInt();

// splitting the number into each digit.
int hundreds = number % 1000 /100;
int tens = number % 100 / 10;
int ones = number - (hundreds*100) -(tens*10);

//the sum of all the digits
int sum = hundreds + tens + ones;

//prints out sum of the digits
System.out.println("The sum of the digits is " + sum);
}
/**
* Homework Problem 2.13
*/
public static void compoundValue()
{
//Scanner and asking for savings amount
Scanner input = new Scanner(System.in);
System.out.print("Enter the monthly saving amount: ");

// setting variables
double savings = input.nextDouble();
double interest = 0.00417;
double totalSavings = 0;

// Just repeated the savings account calculation 5 times
totalSavings += savings+(savings+totalSavings)*interest;
totalSavings += savings+(savings+totalSavings)*interest;
totalSavings += savings+(savings+totalSavings)*interest;
totalSavings += savings+(savings+totalSavings)*interest;
totalSavings += savings+(savings+totalSavings)*interest;
totalSavings += savings+(savings+totalSavings)*interest;

//removing the numbers that come after the second digit beyond the decimal. The addition of 0.5 is to round up.
totalSavings = (int)(totalSavings * 100 + 0.5);
// Printing savings after 6 months
System.out.println("After the sixth month, the account value is $" + totalSavings/100);
}
/**
* Homework Problem 2.21
*/
public static void futureInvestmentValue()
{
//asking for investment amount
System.out.print("Enter investment amount: ");
Scanner input = new Scanner(System.in);
double investmentAmount = input.nextDouble();

//asking for annual rate and changing it to monthly rate while setting it to monthlyPercentage variable.
System.out.print("Enter annual rate in percentage: ");
double monthlyPercentage = ((input.nextDouble()/100)/12);

//asking for years and setting the variable for years.
System.out.print("Enter number of years: ");
int years = input.nextInt();

//investment formula and removing everything after the 2 decimal place
double futureValue = investmentAmount*Math.pow(1+monthlyPercentage, years*12);
futureValue = (int)(futureValue*100 + 0.5);
System.out.println("Future value is $" + futureValue/100);
}
}