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Thread: Math.Random and Arrays
 04102010, 06:26 PM #1Member
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Math.Random and Arrays
this what i got so far. i understand arrays and Math.random i think,but i need to use Math.random and arrays to make 100 random integers between 1 9 what am i doing wrong? and what am i missing
import java.util.*;
import javax.swing.JOptionPane;
public class hw_7 {
public static void main(String[] args){
Scanner input=new Scanner(System.in);
int Random =input.nextInt();
int[] anArray;
anArray = new int[10];
int random =(( int)(Math.random()*10)+99);
anArray[0] = 0;
anArray[1] = 1;
anArray[2] = 2;
anArray[3] = 3;
anArray[4] = 4;
anArray[5] =5;
anArray[6] = 6;
anArray[7] = 7;
anArray[8] = 8;
anArray[9] = 9;
System.out.print(anArray);
}
}
 04102010, 06:38 PM #2
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Welcome to forum. :)
First of all tell me how to generate number from 1 to 9?
 04102010, 06:48 PM #3Member
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thank you. umm is it Random randomGenerator = new Random();
? or it is is Math.random right. i am still new to java
 04102010, 07:01 PM #4
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Yea, but what you've done is not correct, you cannot generate number between 1 and 9.
Java Code:public static void main(String[] args) { Random objRandom = new Random(); int iRandom = objRandom.nextInt(9) + 1; System.out.println(iRandom); }
 04102010, 07:21 PM #5Member
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so if i do something like your code you just posted it will work abit with the arrays,but does that mean i still can use Math.random
 04102010, 07:26 PM #6
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Of course not, I just want you to give a hint, why added extra values and all.
Java Code:public static void main(String[] args) { Random objRandom = new Random(); int[] iArray = new int[100]; for(int index = 0; index < iArray.length; index++) { iArray[index] = (int) (Math.random()*8 + 1); } for(int element = 0; element < iArray.length; element++) { System.out.println(iArray[element]); } }
 04102010, 07:45 PM #7Member
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ahhhh i think i get it. i need to put a for statment in to my cod to make the array to work. you are giving me alot of ideas.but that doesnt explain where 09 arrays is stored. because i have to use a array of 10 integers that says count where the arrays stores (09) i i have to do a counting array
 04122010, 05:08 AM #8
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Did you run that code, and see the result?
Java Code:iArray[index] = (int) (Math.random()*8 + 1);
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