Question

我正在尝试创建一组带有一组数字的代码，通过二次公式运行它们并返回然后打印的答案。

P.S。我是java新手，这是为了学习。

Scanner firstCoeff = new Scanner(System.in);
int ax = firstCoeff.nextInt();
firstCoeff.close();
Scanner secCoeff = new Scanner(System.in);
int bx = secCoeff.nextInt();
secCoeff.close();
Scanner finConstant = new Scanner(System.in);
int c = finConstant.nextInt();

Quadratic_Formula work = new Quadratic_Formula();
work.posquadForm(ax, bx, c);
work.negquadForm(ax, bx, c);

System.out.println("Your answer is" + work.posquadForm() +"or" + work.negquadForm() +".");

这是公式类：

public class Quadratic_Formula {
public double posquadForm(int ax, int bx, int c) {
    int b;
    b = (bx);
    int a;
    a = (ax);

    double posanswer;
    posanswer = ((-b) - Math.sqrt((b^2) + ((-4) * a * c)) / (2 * a));
    return posanswer;
}
public double negquadForm(int ax, int bx, int c) {
    int b;
    b = (bx);
    int a;
    a = (ax);

    double neganswer;
    neganswer = ((-b) + Math.sqrt((b^2) + ((-4) * a * c)) / (2 * a));
    return neganswer;
}

Answer 1

更改为

Quadratic_Formula work = new Quadratic_Formula();
double posAnswer = work.posquadForm(ax, bx, c);
double negAnswer = work.negquadForm(ax, bx, c);

System.out.println("Your answer is" +posAnswer  +"or" + negAnswer  +".");

您的职能posquadForm＆amp; negquadForm已经计算了答案，你只需要将它们存储在变量中并打印出来吗？

Answer 2

您的方法声明如下：

public double posquadForm(int ax, int bx, int c) {

所以只需传递这些变量......

int valueForAx = 2;
int valueForBx = 3;
int valueForC = 4;
System.out.println("Your answer is " + work.posquadForm(valueForAx, valueForBx, valueForC));

Answer 3

旁注，而不是：

int b;
b = (bx);
int a;
a = (ax);

你只需使用：

int b = bx;
int a = ax;

与Alex K的答案相反的是不接受任何参数，只需将ax，bx和c作为全局变量处理（假设四元公式类是内部类）。

public double posquadForm() {

    double posanswer;
    posanswer = ((-bx) - Math.sqrt((bx^2) + ((-4) * ax * c)) / (2 * ax));
    return posanswer;
}

从Java中的方法返回Double / Integer？

3 个答案: