GetFactorialff=newGetFactorial（）;
ff.setInputn（++counter）;
nn=ff.getInputn（）;
System.out.printf（"Computethefactorialofnumber%d...\n",
ff.getInputn（））;
n=ff.factoriall（nn）;
sum+=（double）1/n;//********************veryimportant
System.out.printf（"Thefactorialof%dis%d\n",nn,n）;
System.out.printf（"\nTheexponentialapproximationis:
%.4f\n\n",sum）;
}
//System.out.printf（"\nItsexponentialapproximationis:
%f",sum）;
}
}
packagemy.p4;
publicclassGetFactorial{
privateintcounter;
privateintfactorial;
privateintinputn;
publicGetFactorial（）{
this.counter=0;
this.factorial=1;
this.inputn=0;
}
publicintgetInputn（）{
returninputn;
}
publicvoidsetInputn（intinput）{
this.inputn=input;
}
publicintfactoriall（intinput）{
input=getInputn（）;
while（++counter<=input）{
factorial*=counter;
}
returnfactorial;
}
}
//P139_4$24
packagemy.p4;
publicclassMystery2{
publicstaticvoidmain（Stringargs[]）{
intcount=1;
while（count<=10）{
System.out.println（count%2==1?
"****":
"++++++++"）;
++count;
}//endwhile
introw=10;
intcolumn;
while（row>=1）{
column=1;
//P139_4$26
while（column<=10）{
System.out.print（row%2==1?
"<":
">"）;
++column;
}//endwhile
--row;
System.out.println（）;
}//endwhile
}//endmain
}//endclassMystery2
packagemy.p4;
publicclassP135_4$5{
/**
*@paramargs
*/
publicstaticvoidmain（String[]args）{
//TODOAuto-generatedmethodstub
intx=1;
intsum=0;
sum+=1;
System.out.printf（"Thesumis:
%d",sum）;
//sum1~10
intsum1=0,y=1;
//*inty=1;
while（y<=10）{
sum1+=y;
++y;
//intsum,x,sum1;*/
//++sum1;
System.out.printf（"\nThesumis:
%d",sum1）;
}
}
}
packagemy.p4;
importjava.util.Scanner;
publicclassP136_4$17{
publicstaticvoidmain（String[]args）{
Scannerinput=newScanner（System.in）;
inttanks=0;
doubleeven;
intgallons=0;
intmiles=0;
intincreasedpetrol;
intincreasedmiles;
System.out.print（"startthelooptangks=...\n"）;
while（++tanks<=3）{
System.out.printf（"tanks=%d\n",tanks）;
System.out.print（"inputthepetrolcost:
"）;
increasedpetrol=input.nextInt（）;
gallons=gallons+increasedpetrol;
System.out.print（"inputthemilespast:
"）;
increasedmiles=input.nextInt（）;
miles=miles+increasedmiles;
}
even=（double）gallons/miles;
System.out
.printf（"Thetotalnumberoftankofpetrolcostis%d,whichmeansthat%.2fgallonpetrolwerecostpermile.",
tanks,even）;
}
}
packagemy.p4;
importjava.util.Scanner;
publicclassP136_4$18{
/**
注意花括号再多行中的作用，理解static关键字的含义
*/
publicstaticvoidmain（String[]args）{
Scannerinput=newScanner（System.in）;
intsn;
intremainder;
inttotal;
intincome;
System.out.print（"\nInputtheserialnumber:
"）;
sn=input.nextInt（）;
if（sn==1）{
System.out.println（"\nInputyourincomeofthismonth:
"）;
income=input.nextInt（）;
remainder=1000;
total=remainder+income;
System.out
.printf（"theremainderofthismonthis%d,\nAddtheincome%d,\nThetotalof%dis%d",
remainder,income,sn,total）;
System.out.print（"\ncheckouttheCREDITLIMITED..."）;
checkCreditLmited（total）;
}
if（sn==2）{
remainder=600;
System.out.println（"\nInputyourincomeofthismonth:
"）;
income=input.nextInt（）;
total=remainder+income;
System.out
.printf（"theremainderofthismonthis%d,\nAddtheincome%d,\nThetotalof%dis%d",
remainder,income,sn,total）;
System.out.print（"\ncheckouttheCREDITLIMITED..."）;
checkCreditLmited（total）;
}
if（sn==3）{
remainder=500;
System.out.println（"\nInputyourincomeofthismonth:
"）;
income=input.nextInt（）;
total=remainder+income;
System.out
.printf（"theremainderofthismonthis%d,\nAddtheincome%d,\nThetotalof%dis%d",
remainder,income,sn,total）;
System.out.print（"\ncheckouttheCREDITLIMITED..."）;
checkCreditLmited（total）;
}
}
//
publicstaticvoidcheckCreditLmited（inttotal）{
if（total<500）
System.out.print（"\n********CREDITLIMITEDExceeded********"）;
if（total>=500）
System.out.print（"\n********YOUstillhaveCREDIT*********"）;
System.out.printf（"\nYourcreditis:
%d",total-500）;
}
}
packagemy.p4;
importjava.util.Scanner;
publicclassP138_4$19{
publicstaticvoidmain（String[]args）{
//TODOAuto-generatedmethodstub
Scannerinput=newScanner（System.in）;
intsalarybase=200;
intsalesamount1,salesamount2,salesamount3,salesamount4;
doublesaleprice1=239.99,saleprice2=129.75,saleprice3=99.95,saleprice4=350.89;
doubletotalsalary;
System.out.print（"InputthesalesamountofFOURtypesofproductsofasaler\n\n"）;
System.out.print（"inputthesalesamountofthefirsttypeofproductsofasaler:
\n"）;
salesamount1=input.nextInt（）;
System.out.print（"inputthesalesamountofthesecondtypeofproductsofasaler:
\n"）;
salesamount2=input.nextInt（）;
System.out.print（"inputthesalesamountofthethirdtypeofproductsofasaler:
\n"）;
salesamount3=input.nextInt（）;
System.out.print（"inputthesalesamountofthefourthtypeofproductsofasaler:
\n"）;
salesamount4=input.nextInt（）;
System.out.print（"\n\n\nComputinghistotalsalary...\n\n\n"）;
totalsalary=salarybase+（salesamount1*saleprice1+salesamount2*saleprice2+salesamount3*saleprice3+salesamount4*saleprice4）*0.09;
System.out.printf（"\nThetotalsalaryis%.2f",totalsalary）;
}
}
packagemy.p4;
importjava.util.Scanner;
publicclassP139_4$20{
/**
注意print类型问题
*/
publicstaticvoidmain（String[]args）{
//TODOAuto-generatedmethodstub
Scannerinput=newScanner（System.in）;
Stringname=null,nameinput;
intworkinghour=0;
intcounter=1;
doublesalary=0;
intsalaryperhour=10;
while（counter<=3）{
System.out.print（"\ninputtheworker'sname\n"）;
nameinput=input.next（）;
name=nameinput;
System.out.print（"inputtheworker'sworkinghour\n"）;
workinghour=input.nextInt（）;
if（workinghour>40）{
salary=（workinghour-40）*salaryperhour/2+40
*salaryperhour;
}
if（workinghour<=40）{
salary=workinghour*salaryperhour;
}
System.out
.printf（"\n\nThe%dthworker%sworking%dhoursperweek.\nAndhissalaryis%.2f\n\n\n",
counter,name,workinghour,salary）;
++counter;
}
}
}
packagemy.p4;
importjava.util.Scanner;
publicclassP139_4$21{
/**
*@paramargs
*/
publicstaticvoidmain（String[]args）{
//TODOAuto-generatedmethodstub
Scannerinput=newScanner（System.in）;
intcounter=0;
intnumber;//input
intlargest=0;
intmaxcounter=0;
while（++counter<=10）{
System.out.printf（"\n\nInputthe%dthnumber:
\n",counter）;
number=input.nextInt（）;
if（number>largest）{
largest=number;
System.out.printf（"Thelargestnumberis%d",largest）;
if（number==largest）{
maxcounter=counter;
}
}
if（counter==10）
System.out.printf（"thelargestoneofthetennumberis%d",
largest）;
System.out.printf（"\nthe%dthnuberisthelargest",maxcounter）;
}
}
}
packagemy.p4;
publicclassP139_4$22{
publicstaticvoidmain（String[]args）{
//TODOAuto-generatedmethodstub
intcounter=0;
System.out.print（"N\t10*N\t100*N\t1000*N\t\n"）;
while（++counter<=5）{
System.out.printf（"\n%d\t%d\t%d\t%d\t",counter,10*counter,
100*counter,1000*counter）;
}
}
}
packagemy.p4;
importjava.util.Scanner;
publicclassP139_4$23{
/**
*@paramargs
*/
publicstaticvoidmain（String[]args）{
//TODOAuto-generatedmethodstub
Scannerinput=newScanner（System.in）;
intcounter=0;
intnumber;//input
intlargest=0;
intsecondlargest=0;
intmaxcounter=0;
intsecondmaxcounter=0;
while（++counter<=10）{
System.out.printf（"\n\nInputthe%dthnumber:
\n",counter）;
number=input.nextInt（）;
if（number>largest）{
secondlargest=largest;
largest=number;
System.out.print（"****************************************"）;
System.out.printf（"\nThelargestnumberis%d",largest）;
System.out.printf（"\nThesecondlargestnumberis%d",secondlargest）;
System.out.print（"\n****************************************\n"）;
if（number==largest）{
maxcounter=counter;
}
/*while（secondlargest==largest）{
secondmaxcounter=counter;
}*/
}
if（numberif（number>secondlargest）{
secondlargest=number;
secondmaxcounter=counter;
System.out.print（"****************************************"）;
System.out.printf（"\nThelargestnumberis%d",largest）;
System.out.printf（"\nThesecondlargestnumberis%d",secondlargest）;
System.out.print（"\n****
升级会员 