import java.util.*;
class CheckLine
{
public static void main(String args[])
{
// Create Scanner object
Scanner s=new Scanner(System.in);
// Enter the a,b,c
System.out.println("Enter the a,b,c values");
int a=s.nextInt();
int b=s.nextInt();
int c=s.nextInt();
/* Note: Line equation is ax+by+c=0 */
// Enter the x,y
System.out.println("Enter the x,y planes on the line");
int x=s.nextInt();
int y=s.nextInt();
// Get the expression
boolean p=doTheyLie(a,b,c,x,y);
// "lies" if p is true "does not lie" if not
String st=p?"lies":"does not lie";
System.out.println("The given point "+st+" on the line");
}
public static boolean doTheyLie(int a,int b,int c,int x,int y)
{
return a*x+b*y+c==0;
}
}
Sample outputs of the program
Enter the a,b,c values
6
2
8
Enter the x,y planes on the line
-2
2
The given point lies on the line
Enter the a,b,c values
6
7
8
Enter the x,y planes on the line
2
0
The given point does not lie on the line
Explaining the assertion and CheckLine
return a*x+b*y+c==0; Return whether the line equation formed using this equals 0.
String st=p?"lies":"does not lie"; Set the value to the string st. If the expression p is true, then lies else does not lie is stored in st. The : expression is after the else.
