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1、第一章1.1publicclassTestpublicstaticvoidmain(Stringargs)System.out.println(WelcometoJava!);System.out.println(WelcometoComputerScience!);System.out.println(Programmingisfun.);1.2publicclassTestpublicstaticvoidmain(Stringargs)for(inti=0;i=4;i+)System.out.println(WelcometoJava!);1.3publicclassTestpublics
2、taticvoidmain(Stringargs)System.out.println();System.out.println();System.out.println();System.out.println();publicclassTestpublicstaticvoidmain(Stringargs)System.out.println(A);System.out.println(AA);System.out.println(AAAAA);System.out.println(AA);publicclassTestpublicstaticvoidmain(Stringargs)Sys
3、tem.out.println(VV);System.out.println(VV);System.out.println(VV);System.out.println(V);1.4publicclassTestpublicstaticvoidmain(Stringargs)System.out.println(aa2a3);System.out.println(111);System.out.println(248);System.out.println(3927);System.out.println(41664);1.5publicclassTestpublicstaticvoidmai
4、n(Stringargs)System.out.println(9.5*4.5-2.5*3)/(45.5-3.5);1.6publicclassTestpublicstaticvoidmain(Stringargs)inti=1,sum=0;for(;i=9;i+)sum+=i;System.out.println(sum);1.7publicclassTestpublicstaticvoidmain(Stringargs)System.out.println(4*(1.0-1.0/3+1.0/5-1.0/7+1.0/9-1.0/11);System.out.println(4*(1.0-1.
5、0/3+1.0/5-1.0/7+1.0/9-1.0/11+1.0/13);1.8publicclassTestpublicstaticvoidmain(Stringargs)finaldoublePI=3.14;doubleradius=5.5;System.out.println(2*radius*PI);System.out.println(PI*radius*radius);1.9publicclassTestpublicstaticvoidmain(Stringargs)System.out.println(7.9*4.5);System.out.println(2*(7.9+4.5)
6、;1.10publicclassTestpublicstaticvoidmain(Stringargs)doubleS=14/1.6;doubleT=45*60+30;doublespeed=S/T;System.out.println(speed);1.11publicclassTestpublicstaticvoidmain(Stringargs)intBN=312032486;/originalpersonnumbersdoubleEveryYS,EveryYBP,EveryYDP,EveryYMP;EveryYS=365*24*60*60;EveryYBP=EveryYS/7;Ever
7、yYDP=EveryYS/13;EveryYMP=EveryYS/45;intFirstYP,SecondYP,ThirdYP,FourthYP,FivthYP;FirstYP=(int)(BN+EveryYBP+EveryYMP-EveryYDP);SecondYP=(int)(FirstYP+EveryYBP+EveryYMP-EveryYDP);ThirdYP=(int)(SecondYP+EveryYBP+EveryYMP-EveryYDP);FourthYP=(int)(ThirdYP+EveryYBP+EveryYMP-EveryYDP);FivthYP=(int)(FourthY
8、P+EveryYBP+EveryYMP-EveryYDP);System.out.println(FirstYP);System.out.println(SecondYP);System.out.println(ThirdYP);System.out.println(FourthYP);System.out.println(FivthYP);1.12publicclassTestpublicstaticvoidmain(Stringargs)doubleS=24*1.6;doubleT=(1*60+40)*60+35;doublespeed=S/T;System.out.println(spe
9、ed);1.13importjava.util.Scanner;publicclassTestpublicstaticvoidmain(Stringargs)Scannerinput=newScanner(System.in);System.out.println(inputa,b,c,d,e,fvalueplease:);doublea=input.nextDouble();doubleb=input.nextDouble();doublec=input.nextDouble();doubled=input.nextDouble();doublee=input.nextDouble();第二
10、章packagecn.Testcx;importjava.util.Scanner;publicclasslesson2publicstaticvoidmain(Stringargs)SuppressWarnings(resource)Scannerinput=newScanner(System.in);System.out.print(请输入一个摄氏温度：);doubleCelsius=input.nextDouble();doubleFahrenheit=(9.0/5)*Celsius+32;System.out.println(摄氏温度：+Celsius+度+转换成华氏温度为：+Fahr
11、enheit+度);System.out.print(请输入圆柱的半径和高：);doubleradius=input.nextDouble();inthigth=input.nextInt();doubleareas=radius*radius*Math.PI;doublevolume=areas*higth;System.out.println(圆柱体的面积为：+areas);System.out.println(圆柱体的体积为：+volume);System.out.print(输入英尺数：);doublefeet=input.nextDouble();doublemeters=feet*
12、0.305;System.out.println(feet+英尺转换成米：+meters);System.out.print(输入一个磅数：);doublepounds=input.nextDouble();doublekilograms=pounds*0.454;System.out.println(pounds+磅转换成千克为：+kilograms);System.out.println(输入分钟数：);longminutes=input.nextInt();longyears=minutes/(24*60*365);longdays=(minutes%(24*60*365)/(24*60);System.out.println(minutes+分钟+有+years+年和+days+天);longtotalCurrentTimeMillis=System.currentTimeMillis();longtotalSeconds=totalCurrentTimeMillis/1000;longcurrentSeconds=totalSeconds%60;longtotalMinutes=totalSeconds/60;longcurrentMinutes=(totalSeconds%(60*60)/60;longcurrenth
