Thread: Introduction to programing class. I am stuck on my assignment arrays.

I have an array assignment that I am stuck on. This is the assignment. This is my first time posting here, but I have gained alot of information from the other posts.

Create a program that asks the user how many students there are. Then, for each student, ask for a student id, the first name, last name, and score (must be between 0 and 100 to be valid). When all the data has been entered, calculate and display the average. Allow the user to search for a student by entering a student id. If the student id is valid and a student is found, display the student's full name, score, and deviation of the score from the average. If the student has the highest score, display a message indicating that. Continue asking the user to search for students until the user enters "quit", at which point the program should exit.

The following is the code I have so far. I am not sure how to search the arrays and also how to return all the information from the different arrays.

import java.util.Scanner;
 
public class Assn06 {
 
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
 
// User input number of students	
		System.out.print("Enter the number of students");
		int studentNumber=input.nextInt();
 
		int sum = 0;
 
// Array for student ID
		int[] studentid = new int[studentNumber];
		String[] firstname = new String[studentNumber];
		String[] lastname = new String[studentNumber];
		int[] studentscore = new int[studentNumber];
		int i;
		for ( i = 0 ; i < studentNumber ; i++)
		{
			studentscore[i] = studentid[i];
			firstname[i] = lastname[i];
			System.out.printf("Enter student %d ID : ", i+1);
			int studentId = input.nextInt();			
			studentid[i] = studentId;
 
			System.out.printf("Enter student %d first name : ", i+1);
			String studentFirstname = input.next();
			firstname[i] = studentFirstname;
 
			System.out.printf("Enter student %d last name : ", i+1);
			String studentLastname = input.next();
			lastname[i] = studentLastname;		
 
			System.out.printf("Enter student %d score : ", i+1);
			int studentScore = input.nextInt();
			studentid[i] = studentScore;
			sum += studentScore;		
		}	
 
//Calculate Average
		int average = sum / studentNumber;
 
//Display Average
		System.out.println("The student average is " + average);
 
// Search by student Id
 
		System.out.printf("Search for student by entering ID: ");
		int studentIdsearch = input.nextInt();
 
 
 public static int linearSearch(studentid, studentIdsearch)
{
 
	for (int j = 0 ; j < list.length; j++)
	{
		if (studentIdsearch == list[j])
			return j;
	}
}
 
 
 
	}
 
}

Hi. I understand you are in an intro class, and while your implementation will work for the purpose of this assignment, have you thought about using a separate class to hold all the information for a student? If you do not know what I am talking about, just forget everything I have said and read on..

You are off to a good start. You have this:

public static int linearSearch(studentid, studentIdsearch)
{
 
	for (int j = 0 ; j < list.length; j++)
	{
		if (studentIdsearch == list[j])
			return j;
	}
}

Let us utilize this method for search. Start with the most basic criteria: Allow the user to search for a student by entering a student id. First, which array would you use to search for IDs? The array that holds IDs, of course: studentid! Now, how would you use that for-loop with studentid[]? When do you stop searching? What do you do when you find the ID? Utilize the linearSearch(.., ...) method -- it is all there for you; you just need to fill everything in!