如何打印循环中使用的所有输入

Question

I am trying to have an output where the entered numbers in the loop are all printed out as separate numbers. Example: Entered numbers: 10, 15, 1, 25 .

Here is my code:

import java.util.Scanner;

public class SumofNumbersAbove0 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int number = 0;
        int input;
        for (input = 0; input >= 0;) {
            number = number + input;
            System.out.print("Enter number: ");
            input = scan.nextInt();
        }
        System.out.println("Entered Number: " + input);
        System.out.println("The sum: " + number);
    }
}

I get the sum of all the numbers correctly. But all I get for entered numbers is the final one.

Answer 1

Move your print of input into the loop where each value of input is actually present. Where you have it you only get the last input

for (input = 0; input >= 0;) {
    number = number + input;
    System.out.print("Enter number: ");
    System.out.println("Entered Number: " + input);
    input = scan.nextInt();
}
System.out.println("The sum: " + number);

Answer 2

Issue: In your code the two variables you have input and number (which should rather be named sum) are solving very different purpose. input is acting a transient pedestrial where the user-entered values come and land. From there the value is added into number and then come another user-entered value which lands onto the same pedestrial thereby knocking-off the previous value.

Thus when you print input at the bottom of your code, the value you find is the one which came last to the pedestrial (which in your case is some integer < 0)

Solution: What you want is to perform an operation (print) on each of the input values. You can do either of the following-

1. Perform the operation before losing the value . I mean print the value in the loop itself. Adding the value to number is another operation you are already doing before losing the value
2. Persist all the input values . Here you need to have some bigger pedestrial which can accomodate all the incoming user-entered value without knocking-off previous values. Once you have all the them you can revisit the values and operate on them. printing them could be one operation and accumulating their values in another variable number could be another.

Hope that helps