第3章：代數方面：求解2X2線性方程

/**
 * 代數方面：求解2X2線性方程。
 * ax+by=e; cx+dy=f; x =(ed-bf)/(ad-bc); y=(af-ec)/(ad-bc)
 * 提示用戶輸入a、b、c、d、e和f。
 * 然後顯示結果。
 * 如果ad-bc爲0，報告消息“The equation has no solution!”。
 */
package Test;

import java.util.Scanner;

public class T33Scanner {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter a, b, c, d, e, f: ");
		double a = input.nextDouble();
		double b = input.nextDouble();
		double c = input.nextDouble();
		double d = input.nextDouble();
		double e = input.nextDouble();
		double f = input.nextDouble();
		double adbc = (a * d - b * c);
		
		double x = (e * d - b * f) / adbc;
		double y = (a * f - e * c) / adbc;
		
		System.out.println((adbc == 0) ? "The equation has no solution!" : "x is " + x + " and y is " + y);
		
//		if ((a * d - b * c) == 0)
//			System.out.println("The equation has no solution!");
//		else
//			System.out.println("x is " + x + " and y is " + y);
		
//		boolean even = ((a * d - b * c) == 0);
//		if (even == true)
//			System.out.println("x is " + x + " and y is " + y);
//		else
//			System.out.println("The equation has no solution!");
	}
}