JAVA基础练习题 代码1

       题目：电话计费器，输入通话秒数，按分钟计费。（每分钟0.5元）

public class E01_01电话计费器 {

	public static void main(String[] args) {
		Scanner number = new Scanner(System.in);
		System.out.println("请输入通话秒数:");
		double num = number.nextInt();
		
		double cost = 0;
		if(num%60 == 0 ){
			cost = num/60*0.5;
		}else{
			cost = (int)(num/60+1)*0.5;
		}
		
		System.out.printf("本次通话花费%.2f元",cost);
		number.close();
	}
}

题目：的士计价器（西安市的出租车，起步（2公里以内）价为7元，超过2公里按照每公里3元计算）

public class E01_02的士计费器 { public static void main(String[] args) { Scanner number = new Scanner(System.in); System.out.print("请输入路程:"); double journey = number.nextDouble(); double money = 0; if(journey <= 2){ System.out.println("本次行程花费为7元"); }else{ money = (journey-2)*3+7; System.out.printf("本次行程花费为%.2f元",money); } number.close(); } }

级数	应纳税所得额(含税)	税率(%)	速算扣除数
1	不超过1500元的	3	0
2	超过1500元至4,500元的部分	10	105
3	超过4,500元至9,000元的部分	20	555
4	超过9,000元至35,000元的部分	25	1,005
5	超过35,000元至55,000元的部分	30	2,755
6	超过55,000元至80,000元的部分	35	5,505
7	超过80,000元的部分	45	13,505

计算公式：

缴税=全月应纳税所得额*税率－速算扣除数

全月应纳税所得额=(应发工资－四金)－3500

实发工资=应发工资－四金－缴税

假设四金700元，3500元为起征点，要求输入工资，输出个人所得税和实发工资

public class E01_03个税计算器 {

	public static void main(String[] args) {
		Scanner number = new Scanner(System.in);
		System.out.print("请输入应发工资:");
		double salary1 = number.nextDouble();//应发工资
		
		double salary = 0;//实发工资
		double i = (salary1-700)-3500;//全月应纳税所得额
		double tax = 0;//缴税
		
		if(i > 0){
			if(i <= 1500){
				tax = i*0.03-0;
			}else if(i<=4500){
				tax = i*0.1-105;
			}else if(i<=9500){
				tax = i*0.2-555;
			}else if(i<=35000){
				tax = i*0.25-1005;
			}else if(i <=55000){
				tax = i*0.3-2755;
			}else if(i<=80000){
				tax = i*0.35-5505;
				
			}else{
				tax = i*0.45-13505;
			}
			salary = salary1-700-tax;
			
			System.out.printf("个人所得税为%.2f元，实际所发工资为%.2f元",tax,salary);
		}else{
			salary = salary1-700;
			System.out.printf("个人所得税为0元，实际所发工资为%.2f元",salary);
		}
		number.close();
	}
}

       题目：根据性别和体重计算输血量。女性体重不超过50kg的输血量为200毫升，否则250毫升；男性不超过60kg的输血量为250毫升，否则300毫升。

public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("请输入性别:");
		String sex = input.next();//接收性别
		System.out.print("请输入体重:");
		double weight = input.nextDouble();
		
		int blood = 0;
		if(sex.equals("男")){
			if(weight <= 60){
				blood = 250;
			}else{
				blood = 300;
			}
		}else{
			if(weight <= 50){
				blood = 200;
			}else{
				blood = 250;
			}
		}
		System.out.printf("输血量为%d毫升",blood);
		input.close();
	}
}

public class E01_完数判断 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("请输入一个整数:");
		int number = input.nextInt();
		
		int sum = 0;//因子和
		for(double i = 1;i < number/2;i++){
			if(number%i == 0){
				sum += i;
			}
		}
		System.out.printf("%d%s完数",number,sum==number?"是":"不是");
		
	}

}

public class E01_中美经济赶超 {

	public static void main(String[] args) {
		double china = 49089.82;
		double usa = 142562.75;
		
		int year = 2009;
		while(china < usa){
			china += china*0.08;//china *= (1+0.08)
			usa += usa*0.02;//usa *= (1+0.02)
			year ++;
		}
		System.out.printf("第%d年中国经济赶超美国。",year);
	}

}