Question

非常初学者程序员（2周前开始），我目前遇到Math.atan问题。我目前使用的是Eclipse IDE，我一直试图找出如何为一个三角形做tan ^ -1但它目前无法正常工作。我输入10和5进入控制台，但当实际答案是63.43494882时，它出现了0.4636476090008061。我尝试将side1Two和side2Two转换为度数，但它没有用。

    import java.util.Scanner;
    public class triangleParts {

        public static void main(String[] args) {
    /*
     *        |\
     *        |A\
     *        |  \
     * Side 1 |   \ 
     *        |_   \
     *        |_|__B\
     *         Side 2
     */
        Scanner side1 = new Scanner(System.in);
    System.out.println("Input side 1 here:");
        double side1Two = side1.nextDouble(); 

        Scanner side2 = new Scanner (System.in);
    System.out.println("Input side 2 here:");
        double side2Two = side2.nextDouble();

    //Hypotenuse//
    double hypotenuse = (Math.sqrt((side1Two * side1Two) + (side2Two * side2Two)));
        System.out.println("Hypotenuse");
        System.out.println(hypotenuse);
    //Angle A//
    double angleA = (Math.atan(side2Two/side1Two));
        System.out.println("Angle A");
        System.out.println(angleA);
    //Angle B//
    double angleB = (Math.atan(side1Two/side2Two));
        System.out.println("Angle B");
        System.out.println(angleB);



        }

    }

Answer 1

作为提到的Hovercraft Full Of Eels，该方法返回弧度值，而不是度数值。您可以使用以下内置方法将其设置为度：

 double getDegrees = Math.toDegrees((Math.atan(side2Two/side1Two)))

Answer 2

//Angle A//
double angleA = Math.toDegrees((Math.atan(side2Two/side1Two)));
System.out.println("Angle A");
System.out.println(angleA);
//Angle B//
double angleB = Math.toDegrees((Math.atan(side1Two/side2Two)));
System.out.println("Angle B");
System.out.println(angleB);

这，正在发挥作用;）

Answer 3

以下是您的代码修复为只使用一个扫描仪，并转换为度，因为Math.atan的输出是弧度：

import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    /*
     *        |\
     *        |A\
     *        |  \
     * Side 1 |   \ 
     *        |_   \
     *        |_|__B\
     *         Side 2
     */
    System.out.println("53000's Simple Java Trigonometry Program");
    System.out.println("========================================");

    Scanner sc = new Scanner(System.in); //Declare Scanner

    System.out.print("Input the length of side 1 here:");
    double side1 = sc.nextDouble();

    System.out.print("Input the length of side 2 here:");
    double side2 = sc.nextDouble();

    //Hypotenuse
    double hypotenuse = (Math.sqrt((side1 * side1) + (side2 * side2)));
    System.out.println("The length of the Hypotenuse is: " + hypotenuse);

    //Angle A
    double angleA = Math.toDegrees((Math.atan(side2/side1)));
    System.out.println("The size of Angle A is: " + angleA);

    //Angle B
    double angleB = Math.toDegrees((Math.atan(side1/side2)));
    System.out.println("The size of Angle B is: " + angleB);
  }
}

试试here!

Math.atan不起作用

3 个答案: