loop is cut one element of the array
- by Walaa
The problem is :
Write a program that reads a number n and then declares an array of n elements. The program then fills the array with the first n numbers, where each number is two to the power of the previous. Finally, display array’s contents.
My code :
import java.util.*;
public class Q1 {
static Scanner scan = new Scanner (System.in);
public static void main(String args [] ) {
int num;
int i = 0;
System.out.println("Enter a number :");
num = scan.nextInt();
double [] a=new double[num];
a[0]= num ;
for ( ;i<=a.length-1 ; i++) {
a[i+1] = Math.pow(2,a[i]);
System.out.println((int)(a[i]) );
}
}
}
The error is :
----jGRASP exec: java Q1
Enter a number :
4
4
16
65536
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at Q1.main(Q1.java:16)
----jGRASP wedge2: exit code for process is 1.
why it says that?
And the number by user printed twice!
