13信息 Java2.1

计算需要支付的金额

解答：

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        int n = cin.nextInt();
        double s = n * 95;
        if (s >= 300) {
            s = s * 0.85;
        }
        System.out.printf("%.2f\n", s);
    }
}

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四位数反转

【分析】

首先将四位数读入变量n，然后进行分离。千位等于n/1000，百位等于n/100%10（注意这里取的是商的整数部分），十位数等于n/10%10（这里的%是取余数操作），个位数等于n%10。完整的程序如下：

程序

package Test;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        String num,str;
        Scanner scan=new Scanner(System.in);
        for(int i=0;i<5;i++){
            num=scan.next();
            char a=num.charAt(0);
            char b=num.charAt(1);
            char c=num.charAt(2);
            char d=num.charAt(3);
            if(d-'0'!=0){
                str=String.valueOf(d)+String.valueOf(c)+String.valueOf(b)+String.valueOf(a);
                System.out.println(str);
            }
            else{
                str=String.valueOf(c)+String.valueOf(b)+String.valueOf(a);
                System.out.println(str);
            }
        }
    }
}

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成绩分级管理

学校进行成绩分级管理，取消分数制，改为成绩分级评定。具体办法是：小于60分为E类；60分至70分（不含70分）为D类；70分至80分（不含）为C类；80分至90分（不含）为B类；90分以上为A类。设计一个程序，对输入的成绩进行等价划分。

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner s = new Scanner(System.in);
        int score;
        while (s.hasNext()) {
            score = s.nextInt();
            if (score >= 90 && score <= 100) {
                System.out.println("A");
            } else if (score >= 80 && score <= 89) {
                System.out.println("B");
            } else if (score >= 70 && score <= 79) {
                System.out.println("C");
            } else if (score >= 60 && score <= 69) {
                System.out.println("D");
            } else if (score >= 0 && score <= 59) {
                System.out.println("E");
            } else {
                System.out.println("Score is error!");
            }
        }
    }
}

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Java,Current time, 2557

显示当前北京时间（十二小时制）如：10:50:34 AM

public class Main {
    public static void main(String[] args) {
        // Obtain the total milliseconds since the midnight, Jan 1, 1970
        long totalMilliseconds = System.currentTimeMillis();
        // Obtain the total seconds since the midnight, Jan 1, 1970
        long totalSeconds = totalMilliseconds / 1000;
        // Compute the current second in the minute in the hour
        long currentSecond = totalSeconds % 60;
        // Obtain the total minutes
        long totalMinutes = totalSeconds / 60;
        // Compute the current minute in the hour
        long currentMinute = totalMinutes % 60;
        // Obtain the total hours
        long totalHours = totalMinutes / 60;
        // Compute the current hour
        long currentHour = (totalHours) % 24;
        // Display results
        System.out.print("Current time is " + ((currentHour % 12) + 8) + ":"
                + currentMinute + ":" + currentSecond);

        if (currentHour < 12)
            System.out.println(" AM");
        else
            System.out.println(" PM");
    }
}

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简单分列式 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        if (a > 0) {
            System.out.println(1);
        }
        if (a == 0) {
            System.out.println(0);
        }
        if (a < 0) {
            System.out.println(-1);
        }
    }
}

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停车场收费

import java.util.Scanner;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner Me = new Scanner(System.in);
        for (int i = 0; ; i++) {
            double a = Me.nextDouble();
            if (a <= 3) {
                System.out.printf("5.00\n");
            } else if (((a - 3) * 2 + 5) > 40) {
                System.out.printf("40.00\n");
            } else {
                System.out.printf("%.2f\n", (a - 3) * 2 + 5);
            }
        }
    }
}

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与7无关的数

import java.util.Scanner;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int i;
        long sum = 0;
        for (i = 1; i <= n; i++) {
            if (i % 7 == 0 || i % 10 == 7 || i / 10 == 7) {
                continue;
            }
            sum = sum + i * i;
        }
        System.out.println(sum);
    }
}

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 骑车与走路

import java.util.Scanner;
public class Main {
    public static void main(String args[]) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for (int i = 0; i <= n; i++) {
            double s = scan.nextDouble();
            double tw = s / 1.2;
            double tb = 27 + s / 3 + 23;
            if (tw > tb)
                System.out.println("Bike");
            else if (tw < tb)
                System.out.println("Walk");
            else
                System.out.println("All");
        }
    }
}

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点和正方形的关系 

import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner input = new Scanner(System.in);
        int[] arr = new int[100];
        for (int i = 0; i < 100; i++) {
            int a = input.nextInt();
            int b = input.nextInt();
            if ((a >= -1 && a <= 1) && (b >= -1 && b <= 1)) {
                System.out.println("yes");
            } else
                System.out.println("no");
        }
    }
}

 

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