Thread: Help with java array prgm

My problem is this: obviously i can follow directions and learn. However, I am having trouble developing the thinking development part or thinking in Java. Granted, this is my first computer science class but I'm getting discouraged and falling behind in my class. I want to learn how to write java not just take your perfectly written programs and hand them in as my own although that would get me an A, lol.

So far i have
// i'm attempting to say i want my array to be called tennumbs and have a column size of 10.
int[] tennumbs = new int [10];
//I have no idea what the next following line really means but i found in my book that it needed to be added. Im trying to declare my variable.
for (int i = 0; i < data.length; I++);

is this right so far and how do i prompt for input values? by using java.util.scanner?




heres the requirements for the program.

Working with single dimension arrays.

Write a program that reads positive numbers (integers) and stores them into an array.

1.Write a method to prompt for the input values. (sentinel terminated)

2.Write a method to print the array.

3.Write a method that returns the value of the smallest number.

4.Write a method that returns the value of the largest number.

5.Write a method to find the location of a number (array index + 1) .

6.Write a method to compute the average of the numbers in the array.

7.Write a method to output the results.

The input prompt example

Enter at least unique 10 positive numbers (integers) terminated with a sentinel value (-99)

The output could look like this:

Amount of numbers read: 10

Numbers read: 12, 33, 41, 1, 4, 10, 7, 21, 66, 50

Smallest number was 1 in location 4

Largest number was 66 in location 9

Average was 24.5

I'm trying to prompt the user for 10 seperate integers than save them as seperate elements in the array. So far i have this:
import java.util.ArrayList;
import java.util.Scanner;

public class Arrays {
public static void main(String args[]) {
double [] data;
data = new double [10];


Scanner input = new Scanner(System.in);


//allow user input
System.out.println("Enter one integer from 0-20");
int numb = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb1 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb2 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb3 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb4 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb5 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb6 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb7 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb8 = input.nextInt();
System.out.println("Enter another integer from 0-20");
int numb9 = input.nextInt();

Hey Norm, did you understand and excell in Java right away? I feel like this shouldn't be this hard.

ok. im just gonna keep trying to work hard and hope i hit a revelation sometime lol.

--- Update ---

So i figured it out after a long time staring at my screen. All i need to do now is add a sentinel value to allow the user to enter less than 10 inputs.

import java.util.Scanner;
 
public class ArrayListProject {
public static void main(String args[]) {
 
 
	Scanner in = new Scanner(System.in);
 
int[] squares=new int[10]; 
	for(int i=0; i<10; i++)
	{
		System.out.println("Enter one integer from 0-20");
		squares[i] = in.nextInt();
	}
	in.close();
	printarray(squares);
}
 
public static void printarray(int[] a)
{
	for(int i=0; i<10; i++)
		System.out.println(a[i]);
}