## CS 1401, Quiz 13

**Date:** Monday, November 26, 2007

**Name** (please type
legibly, ideally in block letters):
______________________________________________________________________

**Class section** (9:30 am or 11:30
am):_______________________________
Write a main method that asks the user for a non-negative integer
*n* and returns the average of all the integers from 1 to
*n*. Make sure that a possible division-by-zero exception is
caught by an appropriate error message.

*Reminder:* to compute the average, you need to add up all the
integers from 1 to *n* and then divide the resulting sum by
*n*.

*For extra credit:* take care of the situation when a user
accidentally types in a negative integer. *Warning:* extra
credit will be only given if the main assignment works correctly.

Solution:
public static void main(String[] args){
Scanner read = new Scanner(System.in);
System.out.println("Please enter a non-negative number");
int n = read.nextInt();
int sum = 0;
for(int i = 0; i <= n: i++)
{sum += i;}
try{
int average = sum/n;
System.out.println(average);
}
catch(ArithmeticException e){
System.out.println("An average cannot be determined since it is" +
" not possible to divide by 0");
}
}