java編程全集50題及答案

【程序13個(gè)月起每個(gè)月都生一對(duì)兔子，小兔子長(zhǎng)到第三個(gè)月后每個(gè)月//這是一個(gè)菲契數(shù)列問(wèn)publicclasslianxi01publicstaticvoidmain(String[]args){System.out.println("第1個(gè)月的兔子對(duì)數(shù) System.out.println("第2個(gè)月的兔子對(duì)數(shù) intf1=1,f2=1,f,M=24;for(inti=3;i<=M;i++){f=f2;f2=f1+f2;f1=f;System.out.println("第i個(gè)月的兔子對(duì)數(shù)}}}2101-200publicclasslianxi02publicstaticvoidmain(String[]args){intcount=0;for(inti=101;i<200;i+=2){booleanb=false;for(intj=2;j<=Math.sqrt(i);{if(i%j==0){b=false;break;} {b=true;}}if(b==true){count++;System.out.println(i}System.out.println(素?cái)?shù)個(gè)數(shù)是}}3""""是指一個(gè)三位數(shù)，其各位數(shù)字立方和等于該數(shù)本身。例如：153""153=1的三次方＋5的三次方＋3的publicclasslianxi03publicstaticvoidmain(String[]args){intb1,b2,b3;for(intm=101;m<1000;m++){b3=m/100;b2=m%100/10;b1=m% if((b3*b3*b3b2*b2*b2b1*b1*b1)m)System.out.println(m+"是一個(gè)水仙花數(shù)");}}}}490,90=2*3*3*5nk，然后按下述步驟完成：(1)n，則說(shuō)明分解質(zhì)因數(shù)的過(guò)程已經(jīng)結(jié)束，打印出即可。n<>kn能被kknk的商,作為新的正整數(shù)n,重復(fù)執(zhí)行第一步。nkk+1k的值,import publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);System.out.print("請(qǐng)鍵入一個(gè)正整數(shù): =s.nextInt();intk=2;System.out.print(n+"=");while(k<=n){if(k==n)elseif(n%k==0){System.out.print(k+"*");n=n/k;} }}}5題目：利用條件運(yùn)算符的嵌套來(lái)完成此題：學(xué)習(xí)成績(jī)>=90A表示，60-89分之B表示，60C表示。importjava.util.*;publicclasslianxi05{publicstaticvoidmain(String[]args){intx;charScanners=newScanner(System.in);System.out.print(請(qǐng)輸入一個(gè)成績(jī)x=s.nextInt();grade=x>=90?:x>=60?}}6mn/**00的數(shù)，此數(shù)即為最大公約數(shù)，最小公倍數(shù)為兩數(shù)之積除以最大公約數(shù)。*/import publicstaticvoidmain(String[]args){ a,b,m;Scanners=newScanner(System.in);System.out.print(");a=s.nextInt();System.out.print(");b=s.nextInt();deffcd=newdeff();m=cd.deff(a,b);intn=a*b/System.out.println("最大公約數(shù)m);System.out.println("最小公倍數(shù):"+n);}}classpublicintdeff(intx,inty){intt;if(x<y){t=x;x=y;y=}while(y!=0)if(x==y)returnx;else{intk=x%y;x=y;y=}}return}}7importjava.util.*;publicclasslianxi07{publicstaticvoidmain(String[]args){intdigital=0;intcharacter=0;intother=0;intblank=char[]ch=Scannersc=newScanner(System.in);Strings=sc.nextLine();ch=for(inti=0;i<ch.length;i++){if(ch>='0'&&ch<='9'){digital++;}elseif((ch>='a'&&ch<='z')||ch>'A'&&ch<='Z'){character++;}elseif(ch==''){blank++;}else{other++;}}System.out.println("數(shù)字個(gè)數(shù):"+digital);System.out.println("英文字母?jìng)€(gè)數(shù):"+character);System.out.println("空格個(gè)數(shù):"+blank);System.out.println("其他字符個(gè)數(shù):"+other);}}8題目：求s=a+aa+aaa+aaaa+aa...a的值，其中a是一個(gè)數(shù)字。例如2+22+222 時(shí)共有5個(gè)數(shù)相加)，幾個(gè)數(shù)相加有鍵盤控制。importjava.util.*;publicclasslianxi08{publicstaticvoidmain(String[]args){longa,b=0,sum=0;Scanners=newScanner(System.in);System.out.print("a");a=s.nextInt();intn=s.nextInt();inti=0;while(i<n){b=b+sum=sum+b;a=a*10;++}}}9題目：一個(gè)數(shù)如果恰好等于它的因子之和，這個(gè)數(shù)就稱為"完數(shù)"。例如6=1＋2＋3.編 找出1000以內(nèi)的所有完數(shù)。publicclasslianxi09publicstaticvoidmain(String[]args){System.out.println("11000");for(inti=1;i<1000;i++){intt=for(intj=1;j<=i/2;j++){if(i%j==0){t=t+}}if(t==i)System.out.print(i+ }}}10 1010publicclasslianxi10publicstaticvoidmain(String[]args){doubleh=100,s=100;for(inti=1;i<10;i++){s=s+h;h=h/}System.out.println("經(jīng)過(guò)路程："+s);System.out.println("反彈高度：h2);}}1234publicclasslianxi11publicstaticvoidmain(String[]args){intcount=0;for(intx=1;x<5;x++){for(inty=1;y<5;y++){for(intz=1;z<5;z++)if(x!=y&&y!=z&&x!=z){count++;System.out.println(x*100+y*10+z}}}}System.out.println("共有count個(gè)三位數(shù)}}12題目：企業(yè)的獎(jiǎng)金根據(jù)利潤(rùn)提成。利潤(rùn)(I)低于或等于10萬(wàn)元時(shí)，獎(jiǎng)金可提10%；利潤(rùn)高于10萬(wàn)元，低于20萬(wàn)元時(shí)，低于10萬(wàn)元的部10%提成，高于10萬(wàn)元的部分，可可提成7.5%；20萬(wàn)到40萬(wàn)之間時(shí)，高于20萬(wàn)元的部分，可提成5%；4060萬(wàn)之間時(shí)高于40萬(wàn)元的部分，可提成3%；60100萬(wàn)之間時(shí)，高于60萬(wàn)元的部分，可提成1.5%，高于100萬(wàn)元時(shí)，超過(guò)100萬(wàn)元的部分按1%提成，從鍵盤輸入當(dāng)月利潤(rùn)，求應(yīng)獎(jiǎng)金總importjava.util.*;publicclasslianxi12{publicstaticvoidmain(String[]args){doublex=0,y=0;：");Scanners=newScanner(System.in);x=if(x>0&&x<=10){y=x*0.1;}elseif(x>10&&x<=20){y=10*0.1+(x-10)*0.075;}elseif(x>20&&x<=40)y=10*0.1+10*0.075+(x-20)*}elseif(x>40&&x<=60)y=10*0.1+10*0.075+20*0.05+(x-40)*}elseif(x>60&&x<=100)y=20*0.175+20*0.05+20*0.03+(x-60)*}elseif(x>100)y=20*0.175+40*0.08+40*0.015+(x-100)*}System.out.println("y萬(wàn)}}13publicclasslianxi13publicstaticvoidmain(String[]args){for(intx=1;x<100000;x++){if(Math.sqrt(x+100)%1==0){if(Math.sqrt(x+268)%1==0)System.out.println(x100168又是一個(gè)完全平方數(shù)}}}}}/*按題意循環(huán)應(yīng)該從-100開始（整數(shù)包括正整數(shù)、負(fù)整數(shù)、零，這樣會(huì)多一個(gè)滿足條件的但是我看到大部分人解這道題目時(shí)都把題中的“整數(shù)”理解成正整數(shù)，我也就隨大流了。14importjava.util.*;publicclasslianxi14{publicstaticvoidmain(String[]args){intyear,month,day;intdays=0;intd=0;intinputfymd=newinput();do{e=year=fymd.input();month=fymd.input();day=fymd.input();ifyear0||month0||month12||day0||day31)e=1}}while(for(inti=1;i<month;i++){switch(i){casecasecasecasecasecasecasedays=31;casecasecasecasedays=30;caseif((year%400==0)||(year%4==0&&year%100!=0))days=}else{days=28;}}d+=}System.out.println(yearmonthday是這年的第(d+day)天。}}classpublicintinput()intvalue=Scanners=newScanner(System.in);value=s.nextInt();return}}15importjava.util.*;publicclasslianxi15publicstaticvoidmain(String[]args){inputfnc=newinput();intx=0,y=0,x=fnc.input();y=fnc.input();z=fnc.input();if(x>y)intt=x;x=y;y=}if(x>z){intt=x;x=z;z=}if(y>z){intt=y=z=}System.out.println("+xy}}classpublicintinput()intvalue=Scanners=newScanner(System.in);value=s.nextInt();return}}169*9publicclasslianxi16publicstaticvoidmain(String[]args){for(inti=1;i<10;i++){for(intj=1;j<=i;j++)System.out.print(j+"*"+i+"="+j*i+" ");if(j*i<10){System.out.print("");}}}}}17個(gè)第二天早上又將剩下的桃子一半，又多吃了一個(gè)。以后每天早上都吃了前一天剩下的一半零一個(gè)。到第10天早上想再吃時(shí)，見只剩下一個(gè)桃子了。求第一天共摘了多publicclasslianxi17publicstaticvoidmain(String[]args){intx=1;for(inti=2;i<=10;i++){x=(x+1)*2;}System.out.println("x+"個(gè)桃子}}18題目：兩個(gè)乒乓球隊(duì)進(jìn)行比賽，各出三人。甲隊(duì)為a,b,c三人，乙隊(duì)為x,y,z三人。已抽簽決出三隊(duì)賽手的。publicclasslianxi18staticchar[]m={'a','b','c'staticchar[]n={'x','y','z'publicstaticvoidmain(String[]args){for(inti=0;i<m.length;i++){for(intj=0;j<n.length;j++){if(m[i]=='a'&&n[j]=='x'){}elseif(m[i]=='a'&&n[j]=='y'){}elseif((m[i]=='c'&&n[j]==||(m[i]=='c'&&n[j]=='z')){}elseif((m[i]=='b'&&n[j]==||(m[i]=='b'&&n[j]=='y')){}System.out.println(m[i]+"vs"+}}}}19題目：打印出如下圖案（菱形}}**publicclasslianxi19publicstaticvoidmain(String[]args)intH7,W7;//高和寬必須是相等的奇數(shù)for(inti=0;i<(H+1)/2;i++){for(intj=0;j<W/2-i;j++){System.out.print("");}for(intk=1;k<(i+1)*2;k++){}}for(inti=1;i<=H/2;i++){for(intj=1;j<=i;j++){System.out.print("");}for(intk=1;k<=W-2*i;k++){}}}}20題目：有一分?jǐn)?shù)序列：2/1，3/2，5/3，8/5，13/8，21/13...20publicclasslianxi20publicstaticvoidmain(String[]args){intx=2,y=1,t;doublesum=for(inti=1;i<=20;i++){sum=sum+(double)x/y;t=y;y=x=y+}System.out.println("20}21publicclasslianxi21publicstaticvoidmain(String[]args){longsum=0;longfac=for(inti=1;i<=20;i++){fac=fac*i;sum+=}}}22publicclasslianxi22{publicstaticvoidmain(String[]args){intn=5;recfr=newrec();System.out.println(n+"!="+fr.rec(n));}}classpubliclongrec(intn){longvalue=0;if(n==1){value=} value=n*rec(n-}return}}23題目：有5個(gè)人坐在一起，問(wèn)第五個(gè)人多少歲？他說(shuō)比第4個(gè)2歲。問(wèn)第4個(gè)人歲數(shù)10publicclasslianxi23publicstaticvoidmain(String[]args){intage=10;for(inti=2;i<=5;i++){age=age+2;}}24importjava.util.*;publicclasslianxi24{publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);longa=s.nextLong();Stringss=Long.toString(a);char[]ch=ss.toCharArray();intj=ch.length;System.out.println(ajfor(inti=j-1;i>=0;i--){}}}25importjava.util.*;publicclasslianxi25{publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);inta;a=s.nextInt();Stringss=String.valueOf(a);char[]ch=ss.toCharArray();elseSystem.out.println("}}importjava.util.*;publicclasslianxi25apublicstaticvoidmain(String[]args){Scanners=newScanner(System.in);booleanis=true;longa=s.nextLong();Stringss=Long.toString(a);char[]ch=ss.toCharArray();intj=ch.length;for(inti=0;i<j/2;i++){}else{System.out.println("這不是一個(gè)回文數(shù)");}}}26題目：請(qǐng)輸入星期幾的第一個(gè)字母來(lái)判斷一下是星期幾，如果第一個(gè)字母一樣，則繼 importjava.util.*;publicclasslianxi26{publicstaticvoidmain(String[]args){getChartw=newgetChar();charch=tw.getChar();switch(ch){case'M':case'W':case'F':case'T':charch2=tw.getChar();if(ch2=='U'){System.out.println("Tuesday");elseif(ch2H'){System.out.println("Thursday");else{System.out.println("無(wú)此寫法！");}case'S':charch2=tw.getChar();if(ch2=='U'){System.out.println("Sunday");elseif(ch2'A'){System.out.println("Saturday");else{System.out.println("無(wú)此寫法！");}}}}classpublicchargetChar()Scanners=newScanner(System.in);Stringstr=s.nextLine();charch=str.charAt(0);if(ch<'A'||ch>'Z'){}return}}27100publicclasslianxi27{publicstaticvoidmain(String[]args){booleanb=false;System.out.print(2+"");System.out.print(3+"");for(inti=3;i<100;i+=2)for(intj=2;j<=Math.sqrt(i);j++){if(i%j==0){b=false;}else{b=}if(b==true){System.out.print(i+"}}}publicclasslianxi27apublicstaticvoidmain(String[]args){int[]a=newint[]{2,3,5,7};for(intj=0;j<4;j++)System.out.print(a[j]+"");booleanb=false;for(inti=11;i<100;i+=2){for(intj=0;j<4;j++){if(i%a[j]==0){b=}else{b=}if(b==true){System.out.print(i+"}}}28importjava.util.*;publicclasslianxi28publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);int[]a=newint[10];for(inti=0;i<10;i++){a[i]=}for(inti=0;i<10;i++){for(intj=i+1;j<10;j++){if(a[i]>a[j]){intt=a[i];a[i]=a[j];a[j]=t;}}}for(inti=0;i<10;i++){System.out.print(a[i]+"");}}}29題目：求一個(gè)3*3矩陣對(duì)角線元importpublicclasslianxi29publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);int[][]a=newint[3][3];for(inti=0;i<3;i++){for(intj=0;j<3;j++){a[i][j]=s.nextInt();}}System.out.println("3*3for(inti=0;i<3;i++){for(intj=0;j<3;j++){System.out.print(a[i][j]+"");}}intsum=for(inti=0;i<3;i++){for(intj=0;j<3;j++){if(i==j){sum+=}}}System.out.println("}}30題目：有一個(gè)已經(jīng)排好序的數(shù)組?，F(xiàn)輸入一個(gè)數(shù)，要求按原來(lái)的規(guī)律將它插入數(shù)組importjava.util.*;publicclasslianxi30publicstaticvoidmain(String[]args)int[]a=newint[]{1,2,6,14,25,36,int[]b=new intiScanners=newScanner(System.in);intnum=s.nextInt();if(num>=a[a.length-1]){b[b.length-1]=num;for(i=0;i<a.length;i++){b[i]=a[i];}}elsefor(i=0;i<a.length;i++){if(num>=a[i]){b[i]=}else{b[i]=num;}}for(intj=i+1;j<b.length;j++){b[j]=a[j-1];}}for(i=0;i<b.length;i++){System.out.print(b[i]+"");}}}31importjava.util.*;publicclasslianxi31{publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);inta[]=newint[20];inti=0,j;}while(a[i-1]!=-1);for(j=0;j<i-1;j++){ }for(j=i-2;j>=0;j=j-1){ }}}32importjava.util.*;publicclasslianxi32{publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);longa=s.nextLong();Stringss=Long.toString(a);char[]ch=ss.toCharArray();intj=ch.length;if(j<7){System.out.println("輸入錯(cuò)誤！");}else{System.out.println("截取從右端開始的4～7位是："+ch[j-7]+ch[j-6]+ch[j-}}}33題目：打印出三角形（要求打印出10行如下圖1 publicclasslianxi33publicstaticvoidmain(String[]args){int[][]a=newint[10][10];for(inti=0;i<10;i++){a[i][i]=1;a[i][0]=}for(inti=2;i<10;i++){for(intj=1;j<i;j++)a[i][j]=a[i-1][j-1]+a[i-}}for(inti=0;i<10;i++)for(intk=0;k<2*(10-i)-1;k++)System.out.print("}for(intj=0;j<=i;j++){System.out.print(a[i][j]+" }}}}34importjava.util.Scanner;publicclasslianxi34publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);inta=s.nextInt();intb=s.nextInt();intc=if(a<b){intt=a;a=b=}if(a<c){intt=a;a=c;c=}if(b<c){intt=b;b=c=}System.out.println(ab}}35importjava.util.*;publicclasslianxi35{publicstaticvoidmain(String[]args){intN=8;int[]a=newintScanners=newScanner(System.in);intidx1=0,idx2=0;for(inti=0;i<N;i++){a[i]=}for(inti=0;i<N;i++){System.out.print(a[i]+"}intmax=a[0],min=a[0];for(inti=0;i<N;i++){if(a[i]>max){max=a[i];idx1=i;}if(a[i]<min){min=a[i];idx2=i;}}if(idx1!=0){inttemp=a[0];a[0]=a[idx1];a[idx1]=temp;}if(idx2!=N-1){inttemp=a[N-1];a[N-1]=a[idx2];a[idx2]=temp;}for(inti=0;i<N;i++){System.out.print(a[i]+"");}}}36nmmmimportjava.util.Scanner;publicclasslianxi36{publicstaticvoidmain(String[]args){intN=10;int[]a=newScanners=newScanner(System.in);for(inti=0;i<N;i++){a[i]=}for(inti=0;i<N;i++){System.out.print(a[i]+"}intm=s.nextInt();int[]b=newint[m];for(inti=0;i<m;i++){b[i]=a[N-m+i];}for(inti=N-1;i>=m;i--)a[i]=a[i-}for(inti=0;i<m;i++){a[i]=b[i];}for(inti=0;i<N;i++){System.out.print(a[i]+"");}}}37importjava.util.Scanner;publicclasslianxi37{publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);intn=s.nextInt();boolean[]arr=newboolean[n];for(inti=0;i<arr.length;i++){arr[i]=true;}intleftCount=n;intcountNum=0;intindex=0;while(leftCount>1){if(arr[index]==true){countNum++;if(countNum==3){countNum=0;arr[index]=false;leftCount--;}}index++;if(index==n){index=0;}}for(inti=0;i<n;i++){if(arr[i]==true){}}}}38main*……題目意思似乎不能用length()函數(shù) importjava.util.*;publicclasslianxi38publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);Stringstr=s.nextLine();}}391/1+1/3+...+1/n(利用指針函數(shù))importjava.util.*;publicclasslianxi39publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);System.out.print(n=intn=s.nextInt();System.out.println("}publicstaticdoublesum(intn){doubleres=0;if(n%2==0)for(inti=2;i<=n;i+=2){res+=(double)1/i;}}elsefor(inti=1;i<=n;i+=2){res+=(double)1/i;}}return}}40publicclasslianxi40publicstaticvoidmain(String[]args){intN=5;Stringtemp=null;String[]s=newString[N];s[0]="matter";s[1]=s[2]=s[3]=s[4]=for(inti=0;i<N;i++){for(intj=i+1;j<N;j++)if(compare(s[i],s[j])==false){temp=s[i];s[i]=s[j];s[j]=}}}for(inti=0;i<N;i++){}}staticbooleancompare(Strings1,Strings2){booleanresult=true;for(inti=0;i<s1.length()&&i<s2.length();i++)if(s1.charAt(i)>s2.charAt(i)){result=false;}elseif(s1.charAt(i)<s2.charAt(i)){result=true;}elseif(s1.length()<s2.length()){result=true;}elseresult=}}}return}}41publicclasslianxi41publicstaticvoidmain(String[]args){inti,m,j=0,k,count;{count=0;{}

else{System.out.println(j+"}}}42 果為3位數(shù)。求??代表的兩位數(shù)，及809*??后的結(jié)果。//題目錯(cuò)了！809x=800x+9x+11publicclasslianxi42publicstaticvoidmain(String[]args){inta=809,b,i;{b=i*a;System.out.println}}43publicclasslianxi43publicstaticvoidmain(String[]args){intsum=4;intSystem.out.println("1"+sum+"System.out.println("2"+sum+"System.out.println("組成"+j+"+sum+"}}}44importjava.util.*;publicclasslianxi44publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);intn,i;n=s.nextInt();} funfc=newfun();{intj=n-System.out.println(n+"="+i+"+}}}classpublicintfun(int {inti,flag=0;if(a%i==0){flag=0;break;}elseflag=1;}return(flag)0,}}importjava.util.*;publicclasslianxi44{publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);intn;n=s.nextInt();} for(inti=3;i<=n/2;i+=2){if(fun(i)&&fun(n-i)){System.out.println(n+"="+i+"+"+(n-}}staticbooleanfun(inta){ booleanflag=false;for(inti=2;i<=Math.sqrt(a);i++){if(a%i==0){flag=false;break;}elsereturn(flag)}}45importjava.util.*;publicclasslianxi45{publicstaticvoidmain(String[]args)Scanners=newScanner(System.in);intnum=s.nextInt(); tmp=num;intcount=0;for(inti=0;tmp%9==0;){tmp=tmp/9;count}System.out.println(num+""+count+"9}}46impo