// CSE 142 Winter 2008, Marty Stepp
// This program demonstrates some uses of the Math class
// and methods that return values.
//
public class MathExamples {
	public static void main(String[] args) {
		// statement  - println, call a method, 
		//              declaring/assigning a variable
		//     ends with a semicolon;
		//
		// expression - a value, or something that computes a value
		//     2 * 2
		//     x + 1
		//     Math.pow(3, 4)
		
		System.out.println("hello");
		System.out.println(1 + 2 * 3 - 4);  // a statement that contains an expression
		System.out.println(Math.pow(3, 4));  // a statement that contains an expression
	
		double grade = 2.6;
		// grade = Math.random() * 4;
		// Math.round(grade);
		grade = Math.round(grade);
		System.out.println("Your grade in the course is " + grade);
	
		System.out.println(Math.random());
		System.out.println(Math.random());
	
		// return value - a method computes a result
		//		calling that method is now an expression
		//    whose value is equal to the method's return value
		
		// create a variable named lineSlope,
		// and set it equal to the value returned
		// from calling slope(0, 0, 5, 10)
		double lineSlope = slope(0, 0, 5, 10);
		
		System.out.println("The slope of the line is " + lineSlope);
	}
	
	// Returns the slope of the line between the given points.
	public static double slope(int x1, int y1, int x2, int y2) {
	    double dy = y2 - y1;
	    double dx = x2 - x1;
		 double result = dy / dx;
	    return result;
	}
}