Java實現 洛谷 P1422 小玉家的電費

import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int num=scanner.nextInt();
		double cost=0;
		if(num<=150){
			cost=num*0.4463;
		}else if(num<401){
			cost=(num-150)*0.4663+150*0.4463;
		}else{
			cost=(num-400)*0.5663+0.4663*250+150*0.4463;
		}
		System.out.printf("%.1f",cost);//保留一位小數點
	}
}