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[英]How can I use Java Scanner to take an integer input? NoSuchElementException
[英]How can I store the scanner input integers in Java so I can print the sum of a list of input integer numbers?
我正在做赫爾辛基大學的 Java MOOC,有一個練習要求我創建一個程序,讓您輸入任意數量的數字,但是當您輸入“0”時,它會打印所有先前輸入的總和編號並結束程序。 當您輸入“0”時,我無法弄清楚如何“存儲”輸入數字以計算它們的總和。 該程序可以運行,但輸入“0”會打印“0”。 這是我的代碼的樣子:
public class Application {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Input a number.");
while (true) {
try {
int number = Integer.parseInt(scanner.nextLine());
System.out.println("Input another number.");
if (number == 0) {
System.out.println(number + number);
break;
}
}
catch (NumberFormatException e) {
System.out.println("Please input a valid number.");
}
}
}
如何計算所有輸入數字的總和?
您可以創建一個計數器並像這樣制作 smth,您不需要保存所有數字:
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int sum = 0;
System.out.println("Input a number.");
while (true) {
try {
int number = Integer.parseInt(scanner.nextLine());
sum += number;
System.out.println("Input another number.");
if (number == 0) {
System.out.println(sum);
break;
}
}
catch (NumberFormatException e) {
System.out.println("Please input a valid number.");
}
}
}
根據我上面的評論:
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int sum = 0;
int number = -1;
while (number != 0) {
try {
System.out.print("Input a number (0 to quit): ");
number = Integer.parseInt(scanner.nextLine());
sum += number;
}
catch (NumberFormatException e) {
System.out.println("Please input a valid number.");
}
}
System.out.println("Total:" + sum);
}
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