50道javase练习题.pdf

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1、50道javase练习题（50道javase练习题）program 1Title:classical question:there are a pair of rabbits,bornfrom third months after birth each month a pair of rabbits,small rabbits grow up to third months later,every month anda pair of rabbits,if the rabbit does not die,What is the total number of rabbits per month

2、?1.program analysis:the number of rabbits.1,1,2,3,5,8,13,21.program 2Topic:determine the number of primes between 101-200,and theoutput of all prime numbers.1.program analysis:the method of judging prime numbers:remove 2 to sqrt(a number)with a number,if divisible,It indicates that this number is no

3、t prime,and is a primenumber.program 3Title:print out all the Narcissus numbers”,so called“narcissus number“refers to a three digit number,the numberof cubic and equal to the number itself.For example,153 isa narcissus number”,Because three times three times three times 5+3 153=1.1.program analysis:

4、use the for cycle to control 100-999numbers,each number decomposes a bit,ten bits,hundreds.program 4Title:a positive integer decomposition of the quality factor.For example:enter 90,print out 90=2*3*3*5.Program analysis:to decompose the prime factor of N,we shouldfirst find a minimum prime number k,

5、and then complete thefollowing steps:(1)if the prime number is equal to N,the process of decomposingthe prime factor is finished and printed out.(2)if n k,but n is divisible by K,the value of K shouldbe printed,and divided by N K,a positive integer as a new nyou repeat the first step.(3)if n is not

6、divisible by K,with k+1 as the value of K,repeatthe first step.program 5Title:use the nesting of conditional operators to completethis question:students with academic scores =90 points arerepresented by A,60-89 points are represented by B,and 60points are represented by C.1.program analysis:(a b)a:b

7、?This is a basic example of theconditional operator.program 6Enter two positive integers m and N,find the greatest commondivisor and least common multiple.1.program analysis:using rolling method.program 7Title:enter a line of characters,respectively,the number ofEnglish letters,spaces,numbers and ot

8、her characters.1.program analysis:using the while statement,for the inputcharacter is not n.program 8Topic:s=a+aa+aaa+aaaa+aa.A,where a is a number.Forexample,2+22+222+2222+22222(the total sum of 5 numbers),afew numbers with keyboard control.1.program analysis:the key is to calculate each item value

9、.program 9Topic:if a number is exactly equal to the sum of its factors,this number is called end of a few”.For example 6=123.programming to find all completed within 1000.program 10Topic:a ball from a free fall height of 100 meters,each landinghalf anti jump back to the original height;then fall,for

10、 itin the tenth floor,how many meters?How high is the reboundfor the tenth time?program 11Title:1,2,3,4 numbers,how many different numbers can beformed without each other and three digits?How much are they?1.program analysis:can fill at 100,ten,a number is 1,2,3,4.Then remove the arrangement does no

11、t meet the conditionwhich all arranged.program 12Title:corporate bonuses based on profits.Profit(I)less thanor equal to 10 million yuan,the bonus can be 10%;profit higherthan 10 million,less than 20 million,less than 10 million partof the 10%Commission,higher than 10 million,cocoa percentagebetween

12、20 million to 7.5%;40 million,20 million higher thanthe part the Commission,5%;40 million higher than the partbetween 40 million to 60 million,to the Commission of 3%;between 60 million to 100 million,higher than 60 million,tothe Commission of 1.5%,higher than 100 million,More than 1 million yuan pa

13、rt of the Commission by 1%,from thekeyboard input month profit I,the total amount of bonus shouldbe awarded?1.program analysis:please use a few axes to boundaries,positioning.Note that the definition needs to define integergrowth bonus.program 13Title:an integer,plus 100,is a perfect square number,p

14、lus168 is a complete square number,what is the number?1.program analysis:judgment in less than 100 thousand,thenumber of the first and 100 after the root,then the number ofplus 268 after prescribing,if after prescribing results meetthe following conditions,which is the result of.Please seethe concre

15、te analysis:program 14Enter a certain period of a day,judgment day is the first fewdays this year?1.program analysis:in March 5th,for example,should firstadd up the first two months,and then add 5 days,that is,thefirst few days of the year,special circumstances,leap yearand input month is greater th

16、an 3,need to consider more thanone day.program 15Enter three integers x,y,Z,please put the three number ofsmall to large output.1.program analysis:we try to get the smallest number on X,the first X compared with the Y,if x y will X and Y valuesof exchange,and then x and Z are compared,if x Z will X

17、andZ values of exchange,so that the minimum X.program 16Topic:the output of 9*9 formulas.1.program analysis:branches and are considered a total of 9rows 9,I control line,J control.program 17The monkey eats the peach problem:the monkey takes off severalpeaches on the first day,eats half immediately,i

18、s not addicted,eats one more second,in the morning,will eat the peachremaining half,has eaten one more.After every morning to eatthe rest of the day before a Yibanlingyi.The tenth day in themorning to eat,see only a peach.How much did you pick up forthe first day?.1.program analysis:adopt the method

19、 of reverse thinking,forward inference from.program 18Title:two table tennis team competition,each person three.A team of a,B,C three,B teams for the X,y,Z three.The listof matches has been drawn.Someone asks the players for a listof the matches.A said he is not more than x,C said he did notx,Z,prog

20、rammed to identify a list of three teams racing.1.program analysis:judge the prime number method:use a numberto remove 2 to sqrt(this number),if can be divisible,it showsthat this number is not prime,and vice versa is prime number.program 19Title:print the following pattern(diamond)*TiananmenResultT

21、iananmen*1.program analysis:first,the graphics are divided into twoparts to see,the first four lines of a rule,the latter threelines of a rule,the use of double for cycle,the first layercontrol line,the second layer control column.program 20There is a sequence of fractions:2/1,3/2,5/3,8/5,13/8,21/13

22、.And the sum of the first 20 of the series.1.program analysis:please seize the change rule between thenumerator.program 21Title:1+2!+3!+.+20!1.program analysis:this procedure is to bring the cumulativebecome a multiplicative.program 22Topic:using recursive method to find 5!.1.program analysis:recurs

23、ive formula:fn=fn 1*4!program 23Topic:there are 5 people sit together,ask the fifth personhow old?He said he was 2 years older than fourth.Ask fourthpeople age,he said that more than third people in 2 years.Askthird people,more than second people and two.Ask second people,two years older than the fi

24、rst person said.Finally asked thefirst man,he said,10 years old.How big are fifth people?1.program analysis:using the recursive method,recursive andrecursive backstepping is divided into two stages.If you wantto know the age of fifth people,you need to know the age ofthe fourth person,and in turn,pu

25、sh to the first person(10years old),and then push back.program 24Title:give a no more than 5 positive integers,requirements:first,ask it is a few digits,two,reverse print out yourfigures.program 25Title:a 5 digit,it is not a palindrome judgment.That 12321is a palindrome,a bit and bit the same ten mi

26、llion,withthousands of the same.program 26Title:enter the first letter of the week to determine what dayit is.If the first letter is the same,then continue to judgethe second letter.1.program analysis:using the situation statement is better,if the first letter is the same,then judge to use the situa

27、tionstatement or if sentence to determine the second letters.program 27Title:seeking primes within 100program 28Title:sorting 10 numbers1.program analysis:can use the selection method,from 9 monthsafter the comparison process,select a minimum exchange withthe first element,the next analogy,with seco

28、nd elements and8 Comparison and exchange.program 29Topic:find a 3*3 matrix and diagonal elements1.program analysis:use double for cycle control inputtwo-dimensional array,and then accumulate aii output.program 30Topic:a sorted array.Now enter a number,according to therequirements of the original law

29、 it is inserted into the array.1.program analysis:first determine whether the number isgreater than the last number,and then consider the insertionof the number of the middle,after inserting the element afterthe number,followed by a position.program 31Title:output an array in reverse order.1.program

30、 analysis:the first and the last exchange.program 32Topic:take an integer a from the right end of the beginningof the 4 7.Program analysis:this can be considered:(1)move a to 4 bit first.(2)to set up a low of 4 for 1,the rest of the number 0.Available(0 4)(3)carry on the above two operations.program

31、 33Title:print Yang Hui triangle(print out 10 lines as shownbelow)1.program analysis:One1112113311464115101051program 34Topic:enter the number 3 A,B,C,according to the sequenceof output.1.program analysis:using pointer method.program 35The input array,the largest exchange with the first element,the

32、smallest with the last element exchange,output array.program 36Title:there are n integers,so that the number of the frontof the move back to m position,and finally m number into thefront of the number of Mprogram 37Topic:n personal circle,order arranging.Started from thefirst report(from 1 to 3 repo

33、rt),who reported 3 people outof the circle,leaving the last question is the original number.program 38Title:write a function,find the length of a string,enter thestring in the main function,and output its length.program 39Title:write a function,input n even number,call the functionfor 1/2+1/4+.+l/n,

34、when the input n is odd,call the function1/1+1/3+.+l/n(using pointer function)program 40String sorting.program 41The beach there is a pile of peaches,five monkeys to.The firstmonkey divided the peaches into five parts,one more.The monkeythrew one of the many into the sea and took one.The second monk

35、eys divided the remaining peaches into fiveequally,and another one,which threw one more into the sea,took one,and third,fourth,and fifth monkeys did the same,Ask the original on the beach at least how many peaches?program 42Topic:809*?=800*?+9*?+1?the two digit,8*?the result is two digits,9*?the res

36、ult is 3 digits.Askfor?the double digits,and the result of 809*?.program 43Topic:for the odd number of 0 to 7 can.program 44Topic:an even number can always be expressed as the sum of twoprimes.program 45Topic:whether a prime number can be divisible by 9program 46Title:two string connection programpr

37、ogram 47Title:read the integer number of 7 numbers(1-50),read avalue every time,and print out the number of the value.program 48Topic:using a public telephone transmission of data,the datais four integers,in the transmission process is encrypted,encryption rules are as follows:Each figures with 5,an

38、d thendivided by 10 to replace the remainder of the digital,the firstand fourth exchange,second and third exchange.program 49Topic:Calculation of string neutronprogram 50Topic:there are five students,each student has 3 classes ofresults,more than from the keyboard input data(includingstudent number,

39、name,three course results),calculate theaverage score,the status of the original data and calculatedthe average score is stored in the disk file stud.Some of them are C language questions,but they should be donewith JAVA1.coding to achieve the inheritance of electrical relations:use Javadoc annotati

40、on class,all methods,1 electricalappliances class(Wiring)has attributes:power(power),ratedvoltage(pressure),Rated current(current)and DC type(electricity).Method:default construction method(initialization voltage value is220V,AC and DC type is AC),The electrical method(work),the preparation of get a

41、nd setmethod 1 TV for each attribute(TV)attribute:TV type(type),the maximum volume(volume)method has:construction method(current working voltage 100V,50 TV,TV type initializationrainbow 50 inch LCD,maximum volume,200)TV work method(work)TV output al 1 the attributes in the work of the value,writeget

42、 and set L for the TV refrigerator Category attribute(Icebox)attribute:Volume(capacity)method with voltage methodachieve initialization refrigerator 110V,current 53,capacity of working methods 230.5 refrigerator(work)attribute,refrigerator get prepared with set method thevalue of output all attribut

43、es in the work of the refrigerator;Through inheritance to achieve the above requirements,andprepare the test class WiringTest test.2.encoding is realized using Employee and Programmer twoentities to illustrate the inheritance of a company.L Employee has the name and academic field attributes,and nee

44、dsto provide methods to implement and display the values of theseattributes.Programmer classes have attributes that represent their skillsets,which indicate the programmer,s expertise in programminglanguages,operating systems,and databases.Similarly,need to provide a method to receive and display th

45、evalues of these properties.analysis showed that theEmployee class is a base class,which contains the name andqualification members and twoTwo methods for receiving and displaying information(acceptDetails()and displayDetails().Derived classescalled Programmer include languages,os,and database3 memb

46、ers and two methods for receiving(acceptSkillSet()anddisplaying information(displaySkillSet().Creates an objectfor the Programmer class,and call the base class and derivedclassesMethod to store and retrieve values.L modifies the aboveprogram to derive a new class from Programmer class derivationto J

47、avaProgrammer,and the value of each member variable of thenew class passes the corresponding constructorIncoming reception.Call the appropriate method to display the information,analysis suggests that the new class ofJavaProgrammerderives from the Programmer class and contains experience andprojects data members as wellDisplayJvPrgDetails()method.Create a JavaProgrammer classobject,and complete the assignment by all members of it.