Java Programming String Array Trouble

Question

import java.util.Scanner;

public class GradePointAverage {

    public static void main(String[] args) {
        Scanner peace = new Scanner(System.in);
        System.out.print("How many subjects do you want to enter?: ");

        int a=peace.nextInt();
        String[] b = new String[a];

        for(int i=0;i<a;i++) {
            b[i]="";    
            System.out.print("Enter Subject No "+(i+1)+" ");
            String c=peace.next();
        }

        for(i=0;i<b.length;i++) {
            System.out.print(b[i]);
        }
    }
}

Greetings. :) We have a programming experiment and well I was stuck in this part. I need to ask the user how many subjects he wants to enter and ask the user to input the subjects. I think I already entered the subjects on the array but when i want to see the content of the array it won't give me my desired output, the subjects i entered won't appear. Please help, I'm new here on this site and it's my first time to ask a question on a forum like this. Hoping that someone would reply. Thanks.

replace String c = peace.next(); with b[i] = peace.nextLine(); — EpicPandaForce
– EpicPandaForce, Commented Mar 10, 2015 at 8:48
Jens is correct, you do nothing with String c. Also you might want to use more appropriate variable names. It will help prevent confusion. ie: Scanner peaceScanner, int a -> int subjectCount. int i is conventional though so no problem there,although I would declare it in your loop -> for(int i... — Pieter De Bie
– Pieter De Bie, Commented Mar 10, 2015 at 8:51
Just a suggestion: name your variables with meaningful names! Not a, b, c, but subjectsNumber, subjects, subjectsName. — Enrichman
– Enrichman, Commented Mar 10, 2015 at 8:52

Jens · Accepted Answer · 2015-03-10 13:20:15Z

4

You never put the subject into the array.

import java.util.Scanner;

public class GradePointAverage
{

    public static void main(String[] args)
    {
        int i;
        Scanner peace=new Scanner(System.in);
        System.out.print("How many subjects do you want to enter?: ");
        int a=peace.nextInt();
        String []b=new String [a];
        for(i=0;i<a;i++)
        {
            System.out.print("Enter Subject No "+(i+1)+" ");
            b[i]=peace.next();

        }   
            for(i=0;i<b.length;i++)
            {
                System.out.print(b[i]);
            }
    }
}

edited Mar 10, 2015 at 13:20

answered Mar 10, 2015 at 8:48

Jens

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Comments

Eran · Accepted Answer · 2015-03-10 08:48:38Z

1

You never assign the Strings to the array.

Change

String c=peace.next();

to

b[i] = peace.next();

In addition, you should probably add some separator (or new line) when printing the array :

public static void main(String[] args) 
{
    Scanner peace = new Scanner(System.in);
    System.out.print("How many subjects do you want to enter?: ");
    int a = peace.nextInt();
    String[] b = new String[a];
    for(int i = 0; i < a; i++) {
        System.out.print("Enter Subject No " + (i + 1) + " ");
        b[i] = peace.next();
    }
    for(i = 0; i < b.length; i++) {
        System.out.print(b[i] + " ");
    }
}

answered Mar 10, 2015 at 8:48

Eran

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1 Comment

Chuchigo Pokach Pikasaki Over a year ago

Oh gosh. Silly me. Haha. Thank you. :)

Chuchigo Pokach Pikasaki · Accepted Answer · 2015-03-16 14:30:47Z

import java.util.Scanner;
public class GradePointAverage
{
    public static double processAverage(int []SubjectGrades,int SubjectsNumber)
    {
        double sum=0;
        double Ave=0;
        for(int i=0;i<SubjectGrades.length;i++)
        {
            sum=SubjectGrades[i]+sum;
        }
            Ave=sum/SubjectsNumber;
            return Ave;
    }
    public static int processNumericalValue(double Ave)
    {
        int Numeral;
        if(Ave>=98.0&&Ave<100.0)
        {
            Numeral=4;
        }
        else if(Ave>=90.0&&Ave<98.0)
        {
            Numeral=3;
        }
        else if(Ave>=80.0&&Ave<90.0)
        {
            Numeral=2;
        }
        else if(Ave>=75.0&&Ave<80.0)
        {
            Numeral=1;
        }
        else
        {
            Numeral=0;
        }
            return Numeral;
    }
    public static void processLetterGrade(int Numeral)
    {
        if(Numeral==4)
        {
            System.out.println("Congratulations!");
        }
        else if(Numeral==3)
        {
            System.out.println("Your Letter Grade is B!");
        }
        else if(Numeral==2)
        {
            System.out.println("Your Letter Grade is C!");
        }
        else if(Numeral==1)
        {
            System.out.println("Your Letter Grade is D!");
        }
        else
        {
            System.out.println("You Failed!");
        }
    }
    public static void main(String[] args)
    {
        double Ave=0;
        Scanner peace=new Scanner(System.in);
        System.out.print("How many subjects do you want to enter?: ");
        int SubjectsNumber=peace.nextInt();
        int []SubjectGrades=new int [SubjectsNumber];
        String []Subjects=new String [SubjectsNumber];
        for(int i=0;i<SubjectsNumber;i++)
        {
            Subjects[i]=""; 
            System.out.print("Enter Subject No "+(i+1)+": ");
            Subjects[i]=peace.next();
            System.out.println("What is your grade in "+Subjects[i]+": ");
            SubjectGrades[i]=peace.nextInt();
        }
            int Numeral;
            Ave=processAverage(SubjectGrades,SubjectsNumber);
            System.out.println("Your General Average is: "+Ave);
            Numeral=processNumericalValue(Ave);
            System.out.println("Numerical Value is: "+Numeral);
            processLetterGrade(Numeral);
    }
}

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