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/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int sum=0;
		Scanner input = new Scanner(System.in);
		int i = 0; // array starts from 0
        int [] array = new int[100]; // create larger array
        while(i < array.length && sum <= 100) // i should be less then length
        {
           System.out.println("Write in the " + i + " number") ; 
           array[i] = input.nextInt();
           sum += array[i];
           System.out.println("sum is " + sum);
           i++;    // increment i 
        }
	}
}
Success #stdin #stdout 0.1s 380736KB
stdin
45
4
6
7
68
stdout
Write in the 0 number
sum is 45
Write in the 1 number
sum is 49
Write in the 2 number
sum is 55
Write in the 3 number
sum is 62
Write in the 4 number
sum is 130