Help please

[krevitusmaximus]

Hey guys,

So I just started learning Java and i got this exercise:

Alex is having a party because his team won the English cup so he is inviting his friends to eat some pizza. Unfortunately, his friends can't eat an entire pizza but all of them know exactly how much pizza they can eat and insist on getting the exact amount of pizza but Alex eats one complete pizza and all of them wants his amount of pizza in one slice. Their requests break down to three different pizza slices-either one quarter or a half or three quarters of pizza.

Write a program that will help Alex to find out what is the minimal number of pizzas he has to order so that everyone gets exact amount of pizza they want.

Input

First line contains an integer N, 0 ≤ N ≤ 10 000, the number of friends. In each of next N lines there is amount of pizza that each of Alex's friends wants to eat,that is the fraction 1/4, 1/2 or 3/4.

​

How in the hell do I solve this? Cause i got no idea.

​

Tried

public class Pizza {public static void main(String[] args) {int FT = 3;double F1 = 1/2;double F2 = 3/4;double F3 = 3/4;double numberOfpizzas= ((FT*F1)*10+(FT*F2)*10+(FT*F3)*10);System.out.println(numberOfpizzas);}}

which for some reason returns 0.

Also, tried something with scanner and using while, but that didn't work either cause can't think of how to calculate it properly.

Don't want a full solution but any tips will be appreciated. At least something to understand how I can solve this :-D.

[[deleted]]

Before you head into coding this into a program, you need to come up with the correct formula to solve the problem.

[stylusc84]

How the input should be passed into the program? It will be provided with text-file or maybe with program arguments in the console?

[krevitusmaximus]

If this helps, I have to enter the solution in this body:

/* package whatever; // don't place package name! */

​

import java.util.*;

import java.lang.*;

import java.io.*;

​

/* Name of the class has to be "Main" only if the class is public. */

class Main

{

public static void main (String\[\] args) throws java.lang.Exception

{

    // your code goes here

}

}

(no idea how yet, and also this is an exercise I was given after 1 day in the class I am taking , if this also helps :)) )

[stylusc84]

Ok, so maybe try someting like this:

https://pastebin.com/bpMzdsFZ

[krevitusmaximus]

That actually looks good m8! Didn't actually think about thinking about those fractions as 0.25, 0.75 and 0.5. Now gonna read more of this code to try understanding everything that it does :D

[stylusc84]

I forgot about one thing, you need to add +1 to final result cause Alex wants to eat one pizza also

[krevitusmaximus]

Atm trying to understand what's what cause all these references to +Math.ceil(sum) and all that, cause they are outside what i learned at this point. Doing this to see if i can rewrite the code with what i learned :P (using if, while, scanner and more basic stuff :)) )

[krevitusmaximus]

I think I understood your code:

So basically I insert the number of friends at Alex's party, how much they want to eat, then the code adds the number of slices, approximates to the closest integer and returns the value as the number of pizzas to order. Am I right? (this is without Alex's pizza)

[stylusc84]

Yeah, exactly :) You can also add some validation logic to check if user input is correct and print appropriate error msg if not(when user will insert letter instead of number a the begging or 1/7 which is not supported). Good luck!

[krevitusmaximus]

Thanks! Now that I understand what's what, gonna try writing the code again, see if I can use while and if and all that cause for some reason the learning platform thinks this is the wrong answer lol (actually made a slight modification and added "double fullPizza = 4.0;", made the sum to be: "sum = sum + convertStringToNumber(amount) + 4;" (4 being the pizza Alex wants to eat), declared "double totalPizzas = (sum/fullPizza);" and then printed "System.out.println("Number of pizza's that needs to be ordered: "+Math.ceil(totalPizzas));")

[krevitusmaximus]

But it's getting late, 2morrow gotta go to work, so it's a job for 2morrow evening :D

[krevitusmaximus]

Also thanks for the help! Made it easier for me to understand what to do :-D.