Syntax error, insert "Dimensions" to complete ReferenceType

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Syntax error, insert "Dimensions" to complete ReferenceType

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#1 by (0 votes)

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import java.util.Scanner;

public class ModosNormales {
    public static void main(String[] ar) {
        Scanner teclado=new Scanner(System.in);
        int nx,ny,c,n;
        float lx;
        float ly;

        float fn;
        c=172;

        System.out.print("Ingrese valor de nx:");
        nx=teclado.nextInt();
        System.out.print("Ingrese valor de ny:");
        ny=teclado.nextInt();
        System.out.print("Ingrese lx:");
        lx=teclado.nextFloat();
        System.out.print("Ingrese ly:");
        ly=teclado.nextFloat();
        fn=c*(float) Math.sqrt(Math.pow((nx/lx),2)+(float)(Math.pow((ny/ly),2)));

        System.out.print("Fn=");
        System.out.println(fn);

        for(n=0;n<10;n++) { 

            int nx1,ny1;
            float fn1;
            ArrayList<float> fn1= new ArrayList();


               System.out.print("Ingrese valor de nx:");
               nx1=teclado.nextInt();
               System.out.print("Ingrese valor de ny:");
               ny1=teclado.nextInt();
               fn1.add(n,c*(float) Math.sqrt(Math.pow((nx/lx),2)+(float)(Math.pow((ny/ly),2)))); //en cada posición del array guardas un valor de fn1
               System.out.print("Fn=");
               System.out.println(fn1.get(n));


            }


            for (int i=0;i<fn1.size()-1;i++)
             {
                  if (fn1.get(i) = fn1.get(i+1))
             {
                aux++; //si el elemento actual es igual al siguiente, incrementamos la variable aux
              }
            }

               if(fn1[n]>=500)
        {System.out.println("Frecuencia mayor o igual a 500Hz"); break;





    }}}

ArrayList<float> fn1= new ArrayList();

why is he telling me here? :

Syntax error, insert "Dimensions" to complete ReferenceType?

java eclipse

asked by Matias Retamales 10.10.2017 в 01:08

source

1 answer

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score 0 · Answer 1

Your code is riddled with errors.

For example:

The main method:

public static void main(String[] ar) {

You declare fn1 as float and at the same time as ArrayList . Also, you do it in a loop.

 for(n=0;n<10;n++) { 
    int nx1,ny1;
    float fn1;
    ArrayList<float> fn1= new ArrayList();

This comparison lacks an equality sign:

if (fn1.get(i) = fn1.get(i+1))

The variable aux++; is not declared.

Here if(fn1[n]>=500) should use get .

As a comment, I can not see the usefulness of the last loop for and the last if of the code.

I have corrected those points and perhaps others, declaring the variables in their time, etc. The code works (does not give errors).

Code:

import java.util.Scanner;

public class ModosNormales {
    public static void main(String args[]) {

        Scanner teclado = new Scanner(System.in);
        ArrayList<Float> fn1 = new ArrayList();
        int aux = 0; //No sé si debe valer 0, si no le pones el valor inicial que deba llevar
        int nx, ny, c, n;
        float lx;
        float ly;
        float fn;
        c = 172;

        System.out.print("Ingrese valor de nx:");
        nx = teclado.nextInt();
        System.out.print("Ingrese valor de ny:");
        ny = teclado.nextInt();
        System.out.print("Ingrese lx:");
        lx = teclado.nextFloat();
        System.out.print("Ingrese ly:");
        ly = teclado.nextFloat();
        fn = c * (float) Math.sqrt(Math.pow((nx / lx), 2) + (float) (Math.pow((ny / ly), 2)));

        System.out.print("Fn=");
        System.out.println(fn);

        for (n = 0; n < 10; n++) {

            int nx1, ny1;
//            float fn1;

            System.out.print("Ingrese valor de nx:");
            nx1 = teclado.nextInt();
            System.out.print("Ingrese valor de ny:");
            ny1 = teclado.nextInt();
            fn1.add(n, c * (float) Math.sqrt(Math.pow((nx / lx), 2) + (float) (Math.pow((ny / ly), 2)))); //en cada posición del array guardas un valor de fn1
            System.out.print("Fn=");
            System.out.println(fn1.get(n));

        }

        for (int i = 0; i < fn1.size() - 1; i++) {
            if (fn1.get(i) == fn1.get(i + 1)) {
                aux++; //si el elemento actual es igual al siguiente, incrementamos la variable aux
            }
        }

        if (fn1.get(n) >= 500) {
            System.out.println("Frecuencia mayor o igual a 500Hz");
        }

    }
}

A test

Ingrese valor de nx:10
Ingrese valor de ny:20
Ingrese lx:5
Ingrese ly:7
Fn=599.865