java中的正方形应用程序
java中的正方形应用程序
提问于 2018-10-19 03:23:36
这里是编程新手。我需要编写执行以下操作的应用程序...Squaring application instructions
到目前为止，我的代码如下所示。我遇到了一个问题，我的代码不能从负整数读取字符串，也不能正确提示用户输入有效数据。我认为我需要嵌套我的循环，但我在这样做时遇到了麻烦。任何帮助都将不胜感激。谢谢。
import java.util.Scanner;
public class Squaring {
public static int getValidInt(int greaterThan, Scanner scan) {
System.out.println("Enter an integer greater than " + greaterThan + ":" );
int input;
while ( !scan.hasNextInt() ) {
String garbage = scan.next();
scan.nextLine();
System.out.println(garbage + " is not valid input.");
System.out.println("Enter an integer greater than " + greaterThan + ":" );
}
while ( !((input = scan.nextInt()) > greaterThan )) {
int garbage = input;
System.out.println(garbage + " is not greater than 1.");
System.out.println("Enter an integer greater than " + greaterThan + ":" );
}
return input;
}
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int a = 1 ;
int total = 0;
a = getValidInt(a,scan);
int b = a;
System.out.println(a);
long n = a;
while ( n < 1000000 ) {
System.out.println(n*n);
n = n * n;
total = total + 1;
}
System.out.println(b + " exceeded 1,000,000 after " + total + " squarings.") ;
}
}回答 1
Stack Overflow用户
发布于 2018-10-19 03:46:42
不带任何try-catch：
public static int getValidInt(int greaterThan, Scanner scan) {
int input = 0;
boolean valid = false;
while (!valid) {
System.out.println("Enter an integer greater than " + greaterThan + ":");
if (!scan.hasNextInt()) {
String garbage = scan.next();
System.out.println(garbage + " is not valid input.");
} else {
input = scan.nextInt();
if (input <= greaterThan) {
System.out.println(input + " is not greater than " + greaterThan);
} else {
valid = true;
}
}
}
return input;
}
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int a = getValidInt(1, scan);
System.out.println(a);
int total = 0;
long n = a;
while ( n < 1000000 ) {
n = n * n;
System.out.println(n);
total++;
}
System.out.println(a + " exceeded 1,000,000 after " + total + " squarings.") ;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/52881144
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