Thread: calculate sum and product

The program is supposed to calculate the sum of number 1-5 and calculate the product of number 1-5. This is my code:

package homeworktest;
 
/**
 *
 * @author user
 */
public class HomeworkTest {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int count = 0;
        int sum = 0;
        int product = 0;
        do
        {
            count++;
            sum += count;
            product *= count;
            if (count == 5)
                System.out.println("Sum = " + sum);
                System.out.println("Product = " + product);
        } while (count < 5);
                } //end main
 
 
        }

This is the output I get:
run:
Product = 0
Product = 0
Product = 0
Product = 0
Sum = 15
Product = 0

For future reference, please wrap your code in the [highlight][/highlight] tags.

I suggest writing down the math on a piece of paper, going through the algorithm the code executes a step at a time. As hint, 0 time anything will still be zero.

In your code:

int product = 0;

And later on:

product *= count;

0*1 = ?
0*2 = ?
0*3 = ?
...

A tip:
Whenever initializing a variable to keep track of a product, initialize it to the first entry or factor.

//do not do this
int product = 0;
product *= intArray[0];
product *= intArray[1];
product *= intArray[2];
...
 
//do this
int product = intArray[0];
//or
int product = 1;

Also:

if (count == 5)
                System.out.println("Sum = " + sum);
                System.out.println("Product = " + product);

Java allows syntax for using the if statement implicitly with no braces, but only one statement following the if clause is counted in the implied "then" clause. If you use braces, you are being explicit and explicit is better.