if statements

Example 1:

// A short console based Java program is shown below that 
// demonstrates how you might use an if statement

import java.util.Scanner;

public class Sample3 {
        
    public Sample3() {
    }
    
    public static void main(String[] args) {
        
        Scanner scan = new Scanner (System.in);
        
        System.out.println("Slope of a Line");
        System.out.println();
        System.out.println();
        System.out.print("Enter x1 ");
        double x1 = scan.nextDouble();
        System.out.print("Enter y1 ");
        double y1 = scan.nextDouble();
        System.out.println();
        System.out.print("Enter x2 ");
        double x2 = scan.nextDouble();
        System.out.print("Enter y2 ");
        double y2 = scan.nextDouble();
        System.out.println();
        System.out.println();
        if (x2 != x1)
        {
            double slope = (y2-y1)/(x2-x1);
            System.out.println("The slope of the line is " + slope);
        }
        System.out.println();
        System.out.println();



    }
}



Example 2:

// A short console based Java program is shown below that 
// demonstrates how you might use an if else statement

import java.util.Scanner;

public class Sample3 {
        
    public Sample3() {
    }
    
    public static void main(String[] args) {
        
        Scanner scan = new Scanner (System.in);
        
        System.out.println("Slope of a Line");
        System.out.println();
        System.out.println();
        System.out.print("Enter x1 ");
        double x1 = scan.nextDouble();
        System.out.print("Enter y1 ");
        double y1 = scan.nextDouble();
        System.out.println();
        System.out.print("Enter x2 ");
        double x2 = scan.nextDouble();
        System.out.print("Enter y2 ");
        double y2 = scan.nextDouble();
        System.out.println();
        System.out.println();
        if (x2-x1==0)
        {
            System.out.println("The slope of the line is undefined");           
        }
        else
        {
            double slope = (y2-y1)/(x2-x1);
            System.out.println("The slope of the line is " + slope);
        }
        System.out.println();
        System.out.println();



    }
}