第4次作业
1.输入商品单价，数量，求总价。活动8折后抹零，计算活动价。
输入付款金额，计算找零并输出
package dsczy;
import java.util.Scanner;
public class Test1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入商品的单价");
double dj = input.nextDouble();
System.out.println("请输入商品的数量");
int sl = input.nextInt();
double zj = sl * dj;
System.out.println("总价是" + zj);
double hdj = zj * 0.8;
System.out.println("折后价是" + hdj);
System.out.println("请输入付款金额");
double fkje = input.nextDouble();
double zl = fkje - hdj;
System.out.println("找零是" + zl);
}
}
2.输入一个三位数，求个位，十位和百位
package dsczy;
import java.util.Scanner;
public class Test2 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("请输入一个三位数");
int a=input.nextInt();
int gewei=a%10;
int shiwei=a%100/10;
int baiwei=a/100%10;
System.out.println("个位是"+gewei);
System.out.println("十位是"+shiwei);
System.out.println("百位是"+baiwei);
}
}
3.输入大写字母，转成对应的小写字母
package dsczy;
import java.util.Scanner;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner(System.in);
System.out.print("输入大写字母:");
char ch = scan.next().charAt(0);
while (ch < 'A' || ch > 'Z') {
System.out.print("输入错误,请重新输入：");
ch = scan.next().charAt(0);
}
ch = (char) (ch + 32);
System.out.print("小写字母:" + ch);
}
}
4.输入2个数，用三目运算符，输出较大数
package dsczy;
import java.util.Scanner;
public class Test3 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("输入两个数");
int a = input.nextInt();
int b = input.nextInt();
a = a > b ? a : b;
System.out.println("最大的数是"+a);
}
}
5. 输入一个年份,判断是不是闰年(能被4整除但不能被100整除,或者能被400整除)
package zy3;
import java.util.Scanner;
public class Text1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入一个年份");
int year = input.nextInt();
if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
System.out.println("该年份是闰年");
} else {
System.out.println("该年份不是闰年");
}
}
}
6.输入一个4位会员卡号,如果百位数字是随机数,就输出是幸运会员,否则就输出不是.
package zy3;
import java.util.Random;
import java.util.Scanner;
public class Text1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入四位四位会员卡号");
int a = input.nextInt();
Random r = new Random();
int b = r.nextInt(10);
System.out.println("百位随机数是" + b);
if (a % 10 / 100 == b) {
System.out.println("您是幸运会员");
} else {
System.out.println("您不是幸运会员");
}
}
}
7..已知函数,输入x的值,输出对应的y的值.
x + 3 ( x > 0 )
y = 0 ( x = 0 )
x*2 –1 ( x < 0 )
package zy3;
import java.util.Random;
import java.util.Scanner;
public class Text1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入x的值");
int x = input.nextInt();
if (x > 0) {
System.out.println(x + 3);
} else if (x == 0) {
System.out.println(0);
} else {
System.out.println(x * 2 - 1);
}
}
}
8.输入三个数,判断能否构成三角形(任意两边之和大于第三边)
package zy3;
import java.util.Random;
import java.util.Scanner;
public class Text1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
int a = input.nextInt();
int b = input.nextInt();
int c = input.nextInt();
if (a + b > c && a + c > b && b + c > a) {
System.out.println("是三角形");
} else {
System.out.println("不是三角形");
}
}
}
9. 输入年份月份，输出该月的天数（闰年2月29天，条件参考上机练习1）
package zy3;
import java.util.Random;
import java.util.Scanner;
public class Text1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入年份");
int year = input.nextInt();
System.out.println("请输入月份");
int month = input.nextInt();
int days = 0;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
System.out.println(month + "月" + "有31天");
break;
case 4:
case 6:
case 9:
case 11:
System.out.println(month + "月" + "有30天");
case 2:
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
days = 29;
} else {
days = 28;
}
System.out.println("二月" + "有" + days + "天");
break;
default:
break;
}
}
}
10.给定一个成绩a，使用switch结构求出a的等级
package zy3;
import java.util.Random;
import java.util.Scanner;
public class Text1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入成绩");
int a = input.nextInt();
switch (a / 10) {
case 10:
System.out.println("A");
break;
case 9:
System.out.println("A");
break;
case 8:
System.out.println("B");
break;
case 7:
System.out.println("C");
break;
case 6:
System.out.println("D");
break;
default:
System.out.println("E");
break;
}
}
}
11.输入一个数字，判断是一个奇数还是偶数
package zy3;
import java.util.Scanner;
public class Text2a {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入一个数字");
int a = input.nextInt();
if (a % 2 == 0) {
System.out.println("这个数是偶数");
} else {
System.out.println("这个数是奇数");
}
}
}
12.编写程序， 判断一个变量x的值，如果是1， 输出x=1，如果是5，输出x=5，如果是 10，输出 x=10，除了以上几个值，都输出x=none。
package zy3;
import java.util.Scanner;
public class Text2a {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入一个数字");
int a = input.nextInt();
if (a == 1) {
System.out.println("1");
} else if (a == 5) {
System.out.println("5");
} else if (a == 10) {
System.out.println("10");
} else
System.out.println("none");
}
}
13.判断一个数字是否能被5和6同时整除（打印能被5和6整除），或只能被5整除（打印能被5整除 ），或只能被6整除，（打印能被6整除），不能被5或6整除，（打印不能被5或6整除）
package zy3;
import java.util.Scanner;
public class Text2a {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入一个数字");
int a = input.nextInt();
if (a % 5 == 0 && a % 6 == 0) {
System.out.println("能被5和6整除");
} else if (a % 5 == 0 && a % 6 != 0) {
System.out.println("能被5整除");
} else if (a % 5 != 0 && a % 6 == 0) {
System.out.println("能被6整除");
} else
System.out.println("不能被5和6整除");
}
}
