Question

尝试完成我的第一年comp课程的作业。到目前为止，一切都没问题，但我无法解决这个问题。我想知道是否有人可以在这里帮忙？我尝试将变量改为双打，显然它没有用。

＆＃13;

import java.util.Scanner;
public class CellPhoneProgram {
  public static Scanner keyboard = new Scanner(System.in);
  //declare x and y coordinates for each city
  public static double xa = 100, xb = 100, xc = 340, xd = 230, ya = 360, yb = 360, yc = 250, yd = 140;

  public static int getRange(int city) {
    int range = 0;
    System.out.println("What is the maximum distance (in km) from the center of City " + city + " that you may travel without losing service?");
    range = keyboard.nextInt();
    return range;
  }

   /* ERROR OCCURS HERE */
  public static double distance(double xf, double xi, double yf, double yi) {
    double distance = 0;
    distance = Math.sqrt((Math.pow(xf - xi)) - (Math.pow(yf - xi)));
    return distance;
  }

  public static void main(String[] args) {
    int city1, city2, city3, city4;
    double distance1, distance2, distance3;

    System.out.println("Welcome to the Cell Phone Service Program, where you enter the range of service from four cities," +
      " and we calculate whether or not you lose service.");
    //get range from function
    city1 = getRange(1);
    city2 = getRange(2);
    city3 = getRange(3);
    city4 = getRange(4);

    System.out.println(city3);

    //calculate distances from cities
    distance1 = distance(xb, xa, yb, ya);
    distance2 = distance(xc, xb, yc, yb);
    distance1 = distance(xd, xc, yd, yc);

    System.out.println(distance1);
  }
}

＆＃13;

在这里查看错误：

＆＃13;

File: C:\Users\Katie\Documents\Homework\CellPhoneProgram.java  [line: 16]
Error: method pow in class java.lang.Math cannot be applied to given types;
  required: double,double
  found: double
  reason: actual and formal argument lists differ in length
File: C:\Users\Katie\Documents\Homework\CellPhoneProgram.java  [line: 16]
Error: method pow in class java.lang.Math cannot be applied to given types;
  required: double,double
  found: double
  reason: actual and formal argument lists differ in length

＆＃13;

这段代码肯定还在进行中，对于混乱和不完整的代码以及所有这一切感到抱歉。

Answer 1

Math.pow（）需要两个参数而不是一个。我猜你想提高到第二个权力，所以第二个参数应该是2.

memset

请参阅http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html#pow%28double,%20double%29

新错误：实际和正式参数列表的长度不同

1 个答案: