Object oriented programming week 3 Compute Sum tutorial

Publicado em: 07 Julho 2026
no canal de: Suemon Kwok

/*Object oriented programming Lab 2 question 5

Complete the main method in the ComputeSum class by using a do-while loop to read numbers from the user with the prompt "Please Enter a Number".
When the user enters a negative number then the loop should stop, and output the sum of the numbers input (excluding the negative number input)

For example:
Test Input Result
ComputeSum.main(new String[]{}); 2
3
5
6
-1 Please Enter a Number
Please Enter a Number
Please Enter a Number
Please Enter a Number
Please Enter a Number
16

ComputeSum.main(new String[]{}); -1 Please Enter a Number
0

ComputeSum.main(new String[]{}); 2
3
4
-1 Please Enter a Number
Please Enter a Number
Please Enter a Number
Please Enter a Number
9

ComputeSum.main(new String[]{}); 0
6
2
3
4
-9 Please Enter a Number
Please Enter a Number
Please Enter a Number
Please Enter a Number
Please Enter a Number
Please Enter a Number
15

import java.util.Scanner;
public class ComputeSum
{
public static void main(String[] args)
{
Scanner scan = new Scanner(System.in);

}
}
*/

import java.util.Scanner;

public class ComputeSum {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int sum = 0; // Variable to store the sum
int number;

do {
System.out.println("Please Enter a Number"); // Prompt user for input
number = scan.nextInt(); // Read input from user

if (number less than = 0) {
sum += number; // Add positive numbers to the sum
}
} while (number less than= 0); // Loop continues until a negative number is entered

System.out.println(sum); // Output the sum of entered numbers
scan.close(); // Close the scanner
}
}

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