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Kop
Asked: 2022-10-26 02:25:26 +0800 CST 2022-10-26 02:25:26 +0800 CST

Scanner problem and return

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I have a problem that I raised before and as they told me, I need to show code and be more specific, so here I go. I have to introduce the variable precioby Scanner in a method, and I want to later send that variable precioto the mainto use it in the 2nd method. On the other hand, I would also like to use only one returnto round two figures, but I don't see how. My code:

import java.util.*;

public class Precios {

   public static void main(String[] args) {

      Scanner teclado = new Scanner(System.in);
              
      preciosPorcentajes(teclado);
      preciosSemanales(teclado, precio);
      
   }

   public static void preciosPorcentajes(Scanner teclado) {
      System.out.print("Introduce precio: ");
      double precio = teclado.nextDouble();
      
      for (int i = 1; i <= 3; i++) {
        double porcentaje = 1.0;
        double intereses = precio * porcentaje / 100 * i;
        
        System.out.print(i + " años \t" + intereses * (1.0) + "(1.0%) \t" + intereses * (1.5) + "(1.5%) \t");
      }      
   }
   
   public static void preciosSemanales(Scanner teclado, double precio) {
   
      System.out.print("Introduce el Precio anual: ");
      double precioAnual = teclado.nextDouble();
      System.out.print("Introduce la tasa: ");
      double tasas = teclado.nextDouble();
      System.out.print("Introduce la duración: ");
      int semanas = teclado.nextInt();
   
      for(int i = 1; i <= semanas; i++) {
         double intereses = precio * tasaInteres / 100;
         intereses = redondear(precio, intereses);
         System.out.println("Semana " + i);
         System.out.println("\t Precio Anual: " + (precio));
         System.out.println("\t Intereses: " + intereses);
         precio += intereses + precioAnual;
         precio = redondear(precio, intereses);
      }   
   }    
   public static double redondear(double precio, double intereses) {
   double num = Math.round(precio * 100) / 100.0;
   double num = Math.round(intereses * 100) / 100.0;
   return num;
   }
}

Thanks for the help.

java

1 Answers

  1. Best Answer

    I have to introduce the price variable by Scanner in a method, and I want to send that price variable later to the main to use it in the 2nd method.

    In that case, the method must not be declared as void, which means empty , or what is the same, it does not return anything. You must indicate that the method returns an object of type del return.

    Something like that:

    public static double preciosPorcentajes(Scanner teclado) {
   System.out.print("Introduce precio: ");
   return teclado.nextDouble();
}

    Now, in the call, you would do this:

    public static void main(String[] args) {

   Scanner teclado = new Scanner(System.in);
          
   double precio = preciosPorcentajes(teclado);
   // Usar precio para lo que necesites
   preciosSemanales(teclado, precio);
  
}

    But, it seems that preciosPorcentajes()interest must also be determined. In that case, several solutions are possible:

    • Since as long precioas they interesare of the same type, you can declare an array to store both values ​​and return them from the method
    • Or you can put them in aHashMap
    • Or you can put them in aArrayList
    • Or you can create a new method that calculates the interest
    • Or, best of all, declare both precioas interesmembers of the class if you plan to use them in multiple methods of the same class.

    Since I don't know the context, if it's an exercise, etc, I can't delve deeper into this, proposing the most optimal solution. In addition, the concept is not well understood interesin your context, since you use a loop, as if different interests should apply according to different contexts. As I said in a comment, a method is to do something and it is essential, when programming, to be clear about the purpose of that method, what it should do , and that should be clearly stated in the question.

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