java - "if"语句的多重含义

Question

我正在尝试实现如果斜率一为正(大于零)并且斜率1为正乘以-1

'线程“main”java.lang.Error中出现异常: Unresolved 编译问题:标记“;”上的语法错误，。预期的lope1 无法解析或不是字段

在 LinearSlopeFinder.main(LinearSlopeFinder.java:25);

我尝试过使用“，”代替，但没有骰子

import java.util.Scanner;

public class LinearSlopeFinder {
    public static void main(String[]args){
        double x1, y1, x2, y2, n1, equation, constant = 0 ;
        double slope, slope1, slopeAns;
        Scanner myScanner = new Scanner(System.in);

        System.out.print("    What is the first set of cordinants? example: x,y ... ");
        String coordinate1 = myScanner.nextLine();
        String coordinates[] = coordinate1.split(",");
        x1 = Integer.parseInt(coordinates[0]);
        y1 = Integer.parseInt(coordinates[1]);

        System.out.print("    What is the second set of cordinants? example: x,y ... ");
        String coordinate2 = myScanner.nextLine();
        String coordinates1[] = coordinate2.split(",");
        x2 = Integer.parseInt(coordinates1[0]);
        y2 = Integer.parseInt(coordinates1[1]);

        //remember it is Rise over Run Y's over X's
        slope = (y1-y2);
        slope1= (x1-x2);
        slopeAns= slope / slope1 ;
            //below is the part that is not compiling but I am trying to insert
        if ( slope > 0 ; slope1 > 0 ){
            slope = slope * -1;
            slope1 = slope1 * -1;
        }

Answer 1

您想要使用 && 运算符来表示“and”。我建议您阅读operators section Java 教程(其余部分也很有值(value))。