英文:
Taking input type double separated by space in Java
问题
我需要使用扫描器（Scanner）从用户那里接收以空格分隔的双精度（double）数据类型的输入。
Scanner input = new Scanner(System.in);
System.out.print("exampleDouble: ");
double db = input.nextDouble();
db += input.nextLine();
我认为这个代码片段应该可以工作，寻找一个简单的语句来捕获两个值（都是双精度，用空格分隔）。不使用数组。只需要捕获两个值，不多不少。
示例：58.0 57.3
英文:
I need to use scannner to take input from user for data type double separated by white space.
Scanner input = new Scanner(System.in);
System.out.print("exampleDouble: ");
double db = input.nextDouble();
db+=input.nextLine();
I thought this would work, looking for a simple statement for capturing 2 values (both double, separated by space). no arrays. only need to capture 2 values , not more.
Example : 58.0 57.3
答案1
得分: 1
**不使用数组**
import java.util.Scanner;
public class MyClass {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
double double1 = input.nextDouble();
double double2 = input.nextDouble();
System.out.println("Double1 is " + double1);
System.out.println("Double2 is " + double2);
}
}
**使用数组**
你可以将输入分割为一个字符串数组，然后使用 `Double.parseDouble` 进行解析，如下所示：
Scanner input = new Scanner();
String[] userinput = input.nextLine().split(" ");
double double1 = Double.parseDouble(userinput[0]);
double double2 = Double.parseDouble(userinput[1]);
因此，完整的代码如下：
import java.util.Scanner;
public class MyClass {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
String[] userinput = input.nextLine().split(" ");
double double1 = Double.parseDouble(userinput[0]);
double double2 = Double.parseDouble(userinput[1]);
System.out.println("Double1 is " + double1);
System.out.println("Double2 is " + double2);
}
}
**示例输入/输出**
*输入*
2.5 3.5
*输出*
Double1 is 2.5
Double2 is 3.5
**然而**：正如 @Pschemo 所指出的，你应该只使用两次 `input.nextDouble()`。
英文:
WITHOUT USING ARRAYS
import java.util.Scanner;
public class MyClass {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
double double1 = input.nextDouble();
double double2 = input.nextDouble();
System.out.println("Double1 is "+double1);
System.out.println("Double2 is "+double2);
}
}
WITH ARRAYS
You can split it into a String array, and then parse them using Double.parseDouble like so:
Scanner input = new Scanner();
String[] userinput = input.nextLine().split(" ");
double double1 = Double.parseDouble(userinput[0]);
double double2 = Double.parseDouble(userinput[1]);
Therefore, the full code would be:
import java.util.Scanner;
public class MyClass {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
String[] userinput = input.nextLine().split(" ");
double double1 = Double.parseDouble(userinput[0]);
double double2 = Double.parseDouble(userinput[1]);
System.out.println("Double1 is "+double1);
System.out.println("Double2 is "+double2);
}
}
Sample I/O
Input
2.5 3.5
Output
Double1 is 2.5
Double2 is 3.5
HOWEVER: As @Pschemo so aptly pointed out - you should just be using input.nextDouble() twice.
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