求解二次方程使用方法，java [英] Solving quadratic equation USING METHODS, java

问题描述

我有一个用于求解二次方程的java程序，但是赋值需要我为每个任务提供方法：显示方程，确定方程是否具有真正的解，计算解，并显示解存在。除了检查解决方案是否真实之外，我还有一些方法，除了我们的方法是不明确的。有人可以帮我格式化我的方法，我不太懂得如何实现它们？这里是我到目前为止的代码：

  import java.util.Scanner; 
 public class QuadraticFormula {
 
 public static void main（String [] args）
 {
 //创建扫描器和变量
扫描仪s =新扫描仪（System.in）; 
 System.out.println（Insert value for a：）; 
 double a = Double.parseDouble（s.nextLine（））; 
 System.out.println（插入值为b：）; 
 double b = Double.parseDouble（s.nextLine（））; 
 System.out.println（插入值为c：）; 
 double c = Double.parseDouble（s.nextLine（））; 
 
 //显示底片的格式
 displayEquation（double a，double b，double c）; {
 if（b> 0&& c> 0） {
 System.out.println（a +x ^ 2 ++ b +x ++ c += 0）;} 
 if（b<&& c> 0）{
 System.out.println（a +x ^ 2+ b +x ++ c += 0）;} 
 if（b> 0 && c< 0）{
 System.out.println（a +x ^ 2 ++ b +x+ c += 0）;} 
 if b<&& c< 0）{
 System.out.println（a +x ^ 2+ b +x+ c += 0）;} 
 s.close（）; 
} 
 //工作/公式
 private static double calculateSolution（double a，double b，double c）; 
 {
 double answer1 =（-b + Math.sqrt（Math.pow（b，2） - （4 * a * c）））/（2 * a）; 
 return answer1; 
} 
 
 private static double calculateSolution（double a，double b，double c）; 
 {
 double answer2 =（-b  -  Math.sqrt（Math.pow（b，2） - （4 * a * c）））/（2 * a）; 
 return answer2; 
} 
 //显示结果并检查解决方案是否为虚构（实际或不实际）
 private static void displaySolutions（double answer1，double answer2）; {
 if（Double.isNaN（answer1）|| Double.isNaN（answer2））
 {
 System.out.println（Answer包含虚数）; 
} else System.out.println（的值是：+ answer1 +，+ answer2）; 
} 
} 
  

}

解决方案

您的方法需要在主要方法之外定义。然后，您可以按照以下主要方法调用它们：

  displayEquation（a，b，c）; 
  

您还应该在方法定义之后删除分号。它应该如下所示：

  public class QuadraticFormula {
 
 public static void main（String [] args）
 {
 //创建扫描仪和变量
扫描仪s =新扫描仪（System.in）; 
 System.out.println（Insert value for a：）; 
 double a = Double.parseDouble（s.nextLine（））; 
 System.out.println（插入值为b：）; 
 double b = Double.parseDouble（s.nextLine（））; 
 System.out.println（插入值为c：）; 
 double c = Double.parseDouble（s.nextLine（））; 
 s.close（）; 
} 
 //显示负数的格式
 public static void displayEquation（double a，double b，double c）{
 if（b> 0&& c> ; 0）{
 System.out.println（a +x ^ 2 ++ b +x ++ c += 0）;} 
 if（b& ;& c> 0）{
 System.out.println（a +x ^ 2+ b +x ++ c += 0）;} 
 if（b > 0&& c< 0）{
 System.out.println（a +x ^ 2 ++ b +x+ c += 0）;} 
如果（b <0&& c <0）{
 System.out.println（a +x ^ 2+ b +x+ c += 0）;} 
} 
 
 private static double calculateSolution（double a，double b，double c）{
 double answer2 =（-b  -  Math.sqrt（Math.pow（b，2 ） - （4 * a * c）））/（2 * a）; 
 return answer2; 
} 
 
 //显示结果并检查解决方案是否为虚构（实或否）
 private static void displaySolutions（double answer1，double answer2）{
 if （Double.isNaN（answer1）|| Double.isNaN（answer2））
 {
 System.out.println（Answer包含虚数）; 
} 
 else System.out.println（的值是：+ answer1 +，+ answer2）; 
} 
} 
  

I have a java program written for solving the quadratic equation but the assignment requires me to have methods for each of the tasks: displaying the equation, determining if the equation has real solutions, calculating a solution, and displaying the solutions if they exist. I have methods for everything except for checking if the solutions are real except my methods are saying that they are undefined. Can someone please help me format my methods, I don't quite know how to implement them? here is the code I have thus far:

import java.util.Scanner;
public class QuadraticFormula {

public static void main(String[] args)
{
    //Creating scanner and variables
    Scanner s = new Scanner(System.in);
    System.out.println("Insert value for a: ");
    double a = Double.parseDouble(s.nextLine());
    System.out.println("Insert value for b: ");
    double b = Double.parseDouble(s.nextLine());
    System.out.println("Insert value for c: ");
    double c = Double.parseDouble(s.nextLine());

    //Display format for negatives
    displayEquation(double a, double b, double c);{
    if (b > 0 && c > 0 ){
        System.out.println(a + "x^2 + " + b + "x + " + c + " =0");}
    if (b < 0 && c > 0 ){
        System.out.println(a + "x^2 " + b + "x + " + c + " =0");}
    if (b > 0 && c < 0 ){
        System.out.println(a + "x^2 + " + b + "x " + c + " =0");}
    if (b < 0 && c < 0 ){
        System.out.println(a + "x^2 " + b + "x " + c + " =0");}
    s.close();
    }
    //The work/formula
    private static double calculateSolution(double a, double b, double c); 
    {
    double answer1 = (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
    return answer1;
    }

    private static double calculateSolution(double a, double b, double c); 
    {
    double answer2 = (-b - Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
    return answer2;
    }
    //Display results and check if the solution is imaginary (real or not)
    private static void displaySolutions(double answer1, double answer2); {
    if (Double.isNaN(answer1) || Double.isNaN(answer2))
    {
        System.out.println("Answer contains imaginary numbers");
    } else System.out.println("The values are: " + answer1 + ", " + answer2);
}
}

}

解决方案

Your methods need to be defined outside your main method. You can then call them in your main method like this:

displayEquation(a, b, c);

You also should remove the semicolons after your method definitions. It should look like this:

public class QuadraticFormula {

public static void main(String[] args)
{
    //Creating scanner and variables
    Scanner s = new Scanner(System.in);
    System.out.println("Insert value for a: ");
    double a = Double.parseDouble(s.nextLine());
    System.out.println("Insert value for b: ");
    double b = Double.parseDouble(s.nextLine());
    System.out.println("Insert value for c: ");
    double c = Double.parseDouble(s.nextLine());
    s.close();
}
    //Display format for negatives
    public static void displayEquation(double a, double b, double c) {
        if (b > 0 && c > 0 ){
            System.out.println(a + "x^2 + " + b + "x + " + c + " =0");}
        if (b < 0 && c > 0 ){
            System.out.println(a + "x^2 " + b + "x + " + c + " =0");}
        if (b > 0 && c < 0 ){
            System.out.println(a + "x^2 + " + b + "x " + c + " =0");}
        if (b < 0 && c < 0 ){
            System.out.println(a + "x^2 " + b + "x " + c + " =0");}
    }

    private static double calculateSolution(double a, double b, double c) {
        double answer2 = (-b - Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
        return answer2;
    }

    //Display results and check if the solution is imaginary (real or not)
    private static void displaySolutions(double answer1, double answer2) {
        if (Double.isNaN(answer1) || Double.isNaN(answer2))
        {
            System.out.println("Answer contains imaginary numbers");
        }   
        else System.out.println("The values are: " + answer1 + ", " + answer2);
    }
}

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