java程序设计教程(第六版)课后习题答案(2)

SECONDS=Hour*60*60+Minute*60+Second;

System.out.println (+Hour+"时"+Minute+"分"+Second+"秒");

System.out.println ("换算成秒: " + SECONDS);

}

}

2.7

public class TimeConverter2 {

public static void main(String[] args) {

int SECONDS=10853;

int Hour,Minute,Second;

Second=SECONDS%60;

Minute=(SECONDS-Second)%60;

Hour=(SECONDS-Second-Minute*60)/3600;

System.out.println (SECONDS+"秒，转化为");

System.out.println (Hour+"时"+Minute+"分"+Second+"秒");

}

}

2.9

import java.util.*;

public class Dollarbill {

public static void main(String[] args) {

float Dollar1,Dollar2;

int Ten,Five,One,Quarters,Dimes,Nickles,Pennies;

Scanner reader=new Scanner(System.in);

System.out.println("输入币值：");

Dollar1=reader.nextFloat();

Dollar2=Dollar1*100;

Pennies= (int)Dollar2%5;

Nickles=((int)Dollar2%10-Pennies)/5;

Dimes=((int)Dollar2-Pennies-Nickles*5)%50/10;

Quarters=(int)Dollar2%100/50;

One=((int)Dollar2- Pennies-Nickles*5-Dimes*10-Quarters*50)%500/100;

Five=(int)Dollar2%1000/500;

Ten=(int)Dollar2/1000;

System.out.println(Ten+ "ten dollar bills");

System.out.println(Five+ " five dollar bills");

System.out.println(One+ "one dollar bills");

System.out.println(Quarters+ "quarters dollar bills");

System.out.println(Dimes+ "dimes dollar bills");

System.out.println(Nickles+ "nickles dollar bills");

System.out.println(Pennies+ "pennies dollar bills！");

}

}

2.11

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