Question

所以我正在为我的计算机科学课编写一个程序，我没有错误，但它不会运行。我也必须使用in文件。我想做的项目就在这里 http://www.doralacademyprep.org/ourpages/auto/2016/10/28/50508547/C1%20PRG%20JR.pdf

错误信息在这里

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:864)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at GeeImATree.main(GeeImATree.java:58)

以下是代码：

import java.util.Scanner;
import java.io.File;
import java.io.IOException;

public class GeeImATree {

public static boolean isEquilateral(double sideA, double sideB, double sideC)  {
    if(sideA == sideB && sideB == sideC) {
        return true;
    }
return false;
}
public static boolean isIsosceles(double sideA, double sideB, double sideC) {
    if(!isEquilateral(sideA,sideB,sideC)){
        return (sideA == sideB || sideB == sideC || sideA == sideC);
    }
    return false;
}
public static boolean isRight(double sideA, double sideB, double sideC) {
    if(!isEquilateral(sideA,sideB,sideC) && !isIsosceles(sideA,sideB,sideC)){
        return ( (sideA*sideA) == (sideB*sideB)+(sideC*sideC) || (sideB*sideB) == (sideA*sideA)+(sideC*sideC) || (sideC*sideC) == (sideA*sideA)+(sideB*sideB));
    }
    return false;
}
public static boolean isObtuse(double sideA, double sideB, double sideC) {
    if (!isEquilateral(sideA,sideB,sideC) && !isIsosceles(sideA,sideB,sideC) && !isRight(sideA,sideB,sideC)) {
        return ( (sideA*sideA) > (sideB*sideB)+(sideC*sideC) || (sideB*sideB) > (sideA*sideA) + (sideC*sideC) || (sideC*sideC) > (sideA*sideA)+(sideB*sideB) );
    }
    return false;
}
public static boolean isAcute(double sideA, double b, double c) {
    if(!isEquilateral(sideA,b,c) && !isIsosceles(sideA,b,c) && !isRight(sideA,b,c) && !isObtuse(sideA,b,c)){
        return( (sideA*sideA) < (b*b)+(c*c) || (b*b) < (sideA*sideA) + (c*c) || (c*c) < (sideA*sideA)+(b*b) );
    }
    return false;
}
public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub

    File infile = new File("GEOMETRY.IN"); 
    Scanner scan = new Scanner(infile);
    double x1, y1, x2, y2, x3, y3;
    while(scan.hasNext()) 
    {
        x1 = scan.nextInt();
        y1 = scan.nextInt();
        x2 = scan.nextInt();
        y2 = scan.nextInt();
        x3 = scan.nextInt();
        y3 = scan.nextInt();

        double sideA = Math.sqrt( Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2) );
        double sideB = Math.sqrt( Math.pow(x3 - x1, 2) + Math.pow(y3 - y1, 2) );
        double sideC = Math.sqrt( Math.pow(x3 - x2, 2) + Math.pow(y3 - y2, 2) );

    System.out.println("a= "+sideA+", b= "+sideB+", c= "+sideC);
    if (isEquilateral(sideA,sideB,sideC))
        System.out.println("Equilateral");
    if (isIsosceles(sideA,sideB,sideC))
        System.out.println("Isosceles");
    if (isRight(sideA,sideB,sideC))
        System.out.println("Right");
    if (isObtuse(sideA,sideB,sideC))
        System.out.println("Obtuse");
    if (isAcute(sideA,sideB,sideC))
        System.out.println("Acute little triangle");
    System.out.println("/n-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_");
    }
scan.close();
}

}

在Geometry.IN文件中有以下

0 0 3.5 1.2 9.85 2
0 0 5 0 5 9
0 0 6 8 8 0
0 0 3 7 1 7
0 0 8 4 8 -4

Answer 1

你应该使用nextDouble（）：

x1 = scan.nextDouble();
y1 = scan.nextDouble();
x2 = scan.nextDouble();
y2 = scan.nextDouble();
x3 = scan.nextDouble();
y3 = scan.nextDouble();

并尝试使用此文件：

0 0 3,5 1,2 9,85 2
0 0 5 0 5 9
0 0 6 8 8 0
0 0 3 7 1 7
0 0 8 4 8 -4

此外，您必须舍入乘法结果，例如：

public static boolean isRight(double sideA, double sideB, double sideC) {
    if(!isEquilateral(sideA,sideB,sideC) && !isIsosceles(sideA,sideB,sideC)){
        return ( Math.round(sideA*sideA) == Math.round(sideB*sideB)+Math.round(sideC*sideC) || Math.round(sideB*sideB) == Math.round(sideA*sideA)+Math.round(sideC*sideC) || Math.round(sideC*sideC) == Math.round(sideA*sideA)+Math.round(sideB*sideB));
    }
    return false;

三角类型程序与infile

1 个答案: