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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?
我正在做赫尔辛基大学的 Java MOOC,有一个练习要求我创建一个程序,让您输入任意数量的数字,但是当您输入“0”时,它会打印所有先前输入的总和编号并结束程序。 当您输入“0”时,我无法弄清楚如何“存储”输入数字以计算它们的总和。 该程序可以运行,但输入“0”会打印“0”。 这是我的代码的样子:
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.");
}
}
}
如何计算所有输入数字的总和?
您可以创建一个计数器并像这样制作 smth,您不需要保存所有数字:
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.");
}
}
}
根据我上面的评论:
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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