10网络工程1班_1007022148__实验03.doc

实验报告实验序号：03实验项目名称：数据类型与交互式程序设计学号1007022148姓名专业、班10网络实验地点1-316指导教师实验时间2012.2.28一、实验目的了解并掌握Java语言中数据类型声明和使用方法 掌握Java中运算符的使用方法了解并掌握交互程序Scanner类的使用方法二、实验要求（一）浮点数计算编写一个应用程序，读取两个浮点数，然后打印输出他们的和、差及乘积。（二）时间转换编写一个应用程序，以小时、分、秒读取时间长度，然后全部换算成秒并打印输出结果（例如，1小时28分42秒等于5322秒）。（三）钱币计算编写一个程序，提示输入一个代表总钱数的双精度值，然后确定每种纸币和硬币需要的最少数量以达到输入的总钱数。假设人民币种类如下：佰圆纸钞，伍拾圆纸钞，贰拾圆纸钞，拾圆纸钞，伍圆纸钞，壹圆硬币，伍角硬币，壹角硬币，壹分硬币。（提示：使用求模运算符，自上而下求得每种钱币的数量）。三、实验内容与步骤第一题：浮点数计算/*/ Float.java/ Demonstrate apply to the float data. /*import java.util.Scanner;public class Float /- / main prints the result /- public static void main(String args) float a,b; Scanner scan=new Scanner (System.in); System.out.print(Enter the number of a:); a=scan.nextFloat(); System.out.print(Enter the number of b:); b=scan.nextFloat(); System.out.println(Output a plus b is a+b=+(a+b); System.out.println(Output a subtract b is a-b=+(a-b); System.out.println(Output a multiply b is a*b=+(a*b); 第二题：时间转换/*/ Time.java/ Demonstrate change the time to second. /*import java.util.Scanner;public class Time /- / main prints the result of the change /- public static void main(String args) int hour,munite,second; Scanner scan=new Scanner (System.in); System.out.print(Enter the time:); hour=scan.nextInt(); munite=scan.nextInt(); second=scan.nextInt(); System.out.println(The time is +hour+:+munite+:+second); second=3600*hour+60*munite+second; System.out.println(Output the result is +second); 第三题：钱币计算 第一种做法（会有问题出现：有时会出现分的错误，例如127.63元时，分就只有2分，而127.64元时就没有错了）/*/ Money.java/ Demonstrate the change of money. /*import java.util.Scanner;public class Money /- / main prints the result of the change /- public static void main(String args) double money,a; int a1,a2,a3,a4,a5,a6,a7,a8,a9; Scanner scan=new Scanner (System.in); System.out.print(The money is:); money=scan.nextDouble(); a=money; a1=(int)money/100; money=(int)money%100; a2=(int)money/50; money=(int)money%50; a3=(int)money/20; money=(int)money%20; a4=(int)money/10; money=(int)money%10; a5=(int)money/5; money=(int)money%5; a6=(int)money/1; money=money%1; a7=(int)(money/0.5); money=money%0.5; a8=(int)(money/0.1); money=money%0.1; a9=(int)(money/0.01); System.out.println(The money have +a1 +piece of 100 yuan.); System.out.println(The money have +a2 +piece of 50 yuan.); System.out.println(The money have +a3 +piece of 20 yuan.); System.out.println(The money have +a4 +piece of 10 yuan.); System.out.println(The money have +a5 +piece of 5 yuan.); System.out.println(The money have +a6 +piece of 1 yuan.); System.out.println(The money have +a7 +piece of 0.5 yuan.); System.out.println(The money have +a8 +piece of 0.1 yuan.); System.out.println(The money have +a9 +piece of 0.01 yuan.); 第二种做法：将a9（即分的计算）改为单精度的，就不会出现分有时候胡出错的状况。/*/ Money.java/ Demonstrate the change of money. /*import java.util.Scanner;public class Money /- / main prints the result of the change /- public static void main(String args) double money,a; int a1,a2,a3,a4,a5,a6,a7,a8; float a9; Scanner scan=new Scanner (System.in);System.out.print(The money is:); money=scan.nextDouble(); a=money; a1=(int)money/100; money=money%100; a2=(int)money/50; money=money%50; a3=(int)money/20; money=money%20; a4=(int)money/10; money=money%10; a5=(int)money/5; money=money%5; a6=(int)money; money=money%1; a7=(int)(money/0.5); money=money%0.5; a8=(int)(money/0.1); money=money%0.1; a9=(float)(money/0.01); System.out.println(The money have +a1 + piece of 100 yuan.); System.out.println(The money have +a2 + piece of 50 yuan.); System.out.println(The money have +a3 + piece of 20 yuan.); System.out.println(The money have +a4 + piece of 10 yuan.); System.out.println(The money have +a5 + piece of 5 yuan.); System.out.println(The money have +a6 + piece of 1 yuan.); System.out.println(The money have +a7 + piece of 0.5 yuan.); System.out.println(The