4、”s1+s2+s3endl;计算并显示计算并显示cout,fs1+s2+s3=,s1+s2+s3endl;doubler=1.0;coutr,r=r,rendl;coutnR=M;cinr;l=2*3.1416*r;cout1=MlcndI;s=3.1416*r*r;coutns=：Msendl;J#include显示提示输入的信息键盘输入/计算圆的周长，赋值给变量/显示圆的周长显示圆的面积包含iostream.h头文件voidmainf)输出字符常虽、变昴和字符串charcl=,AcoutW;coutc1cndl:coutnThisisate
5、st.Mendl;coutHMendl;输出整世布最、变議和表达式intn=100;cout10;coutn;cout2*nendl;输出整型表达式coutHMendl;输出浮点型常昴、变昴和表达式doublepi=3.1415926,r=l0.0,s=pi*r*r;coutpiendl;coutr;couts;cout2*r*piendl;输岀浮点型表达式coutnHendl;一个cout口I以输111多项数据cout,W,nnc1cndl;coutnThisisatest.nendl;coutnpi=,tpi,fr=vvrs=Msendl;#in
6、clude包含iostream.h头文件main()输入输出字符chare;cinc;coutnc=r,cendl;/输入输出整型数据intn;cinn;coutMn=Mnendl;J/输入输出浮点型数据doublex;cinx;coutnx=,xendl;#includemain()输入提示cout,ln=r,;coutMn=nendl;劣项输入coutMcnx,cndl;cincnx;coutMc=cMn=t*nr,x=uxcndl：include包含iostream.h文件main()声呦幣型变量intatb;/从键盘上为整型变吊赋值cout,l
10、,lfy=,1;cinfy;coutlH+,fy=nfx+fyendl;coutfxH-tffy*-*1fx-fyendl;coutfxR*,fy,-pfx*fyendl;coutfx7,lfy=ttfx/fyendlendl;/coutfx,%,lfyf,=tffx%fydI;coutdxM-Mdyn-frdx-dyendl;coutdx,1*f*dy,t=Mdx*dyendl;coutdx*7dy*=Mdx/dyendlendl;/coutfx1,%,iyu=,rfx%fycndl;Error!测试float和double数据的有效位fic=100;=60;float
12、32;coutMcI=Hc1endl;coutMc2=,c2endl;/输出字符及ASCII码coutcl,r:Mint(cl)endl;coutc2M:Hint(c2)endl;cout,$,H:”vint($)vcndl;输入字符coutMc1c2Mendl;cinclc2;coutr,c1=,c1c2=r,c2cndl;#include包含iostream.h头文件main()!charcl=,aTAB=,f;阵铃一声coutclendl;使用水平制表符coutlTAB2TAB3TAB4endl;使用双引号coutr,He
18、ta=35,b=2.1,c=0;cout,a=t,aHb=Mbnc=Mcendl;与运算coutHa&b=H(a&b)cndl;输出1coutHa&c=,(a&c)endl;/输出0或运算coutna11b=M(a||b)endl;/输Hl1coiitv”a|c=vv(ai|c)=0&a0&a2*b+2|a2*b+2|ab+3)endl;/输出1#includemain()I按位与运算coutn24&12=M(24&12)endl;按位异或运算coutn24A12=n(24z12)endl;按位或运算cout,r24|12=K(24|12)
19、endl;按位取反运算coutn-24=M(-24)cndl;左移位运算coutn53=H(53)cndl;cout0-53=n(-53)endl;右移位运算coutn53=H(53)endl;coutH-53=M(-53)cndI;#includemain()inta=1,b=1,c=3;显示a,b,c的值coutHa=MaHb=MbHc=Hcendl;b+=a+2*c%5;相当于表达式语句b=b+(a+2*c%5);coutr,(l)b=Mbendl;计算显示(2)a=c2水b;的结果a=l,b=l,c=3;a=c-2*b:/相当于农达式语旬a=a(c-2*b);co
20、utM(2)a=Maendl;计算証示a*=b=c=3;的结果a=1,b=l尸3;a*=b=c=3;相当于语句组c=3;b=c;a=a*b;coutM(3)a=nanb=nbMc=Hcendl;计算显示(4)a+=b+=c;的结果a=l,b=l,c=3;a+=b+=c;相当于语句组b=b+c;a=a+b;coutM(4)a=HaKb=,bnc=,ccndl;计算显示(5)a-=b=+c+2;的结果a=l,b=l,c=3;a-=b=+c+2;相当于语句组+c;b=b+c+2;a=a-b;coutM(5)a=MaMb=Hbnc=Hccndl;#include
21、main()(用size、计算各类种常昴的字节长度coutMsizeof(,S,)=nsizeof,$,)endl;coutMsizeof(1)=Msizeof(l)cndl;coutMsizeof1.5=nsizeof(l.5)endl;coutr,sizeof(HCjood!n)=Msizeof(nCjood!K)endl;/用sizeof计算各类型变量的字节长度inti=!00;charc=rA;floatx=3.1416;doublep=0.1;coutr,sizeofi)=r,sizeofii)endl;coutMsizcof(c)=Msizcof(c)
22、cndl;coutMsizeofx)=nsizeof(x)endl;coutMsizeoffp)=MsizeoRp)endI;用sizeof计算表达式的字节长度coutMsizeof(x+1.732)=wsizeof(x+l.732)endl;用sizeof计算各类型的字节长度coutMsizcof(char)=MsizcofIchar)cndl;coutMsizeofint)=usizeof(int)end1;coutMsizeof(float)=Msizeof(float)endl;cout,sizcofdo
23、ublc)=,sizcof(doublc)cndl;/用sizeof计算数组的字节长度charstr=nThisisatest.”；inta10;doublexy10;coutMsizeof(str)=,sizeof(str)endl;coutMsizeoKa)=sizeoia)endl;coutMsizcofIxy)=,sizcof(xy)cndl;用sizeof计算自定义类型的长度stmetstshortnum;floatmathgrade;floatChinesegrade;floatsumgrade;；ststudentI;coutn
25、nt(x)=,int(x)endl;coutn(int)x=H(int)xcndl;coutnint(1.732+x)=nint(1.732+x)endl;coutM(int)1.732+x=M(int)1.723+xendl;coutndoublc(100)=odouble(10O)endl;#ineludemain()floata,b,s;coutMabHendl;cinab;利用cin从键盘上为变昴a,b赋值s=a;if(ab)s=b;/if语句屮只有这一个语句，川省略花括号s=s*s;变議s中保存a,b中较大的一个数的平方cout,s=Ms;9#
26、includemain()intx,y;coutnx=n;cinx;if(x=0)y=2*x；满足条件执行输出结果不满足条件执行输出结果coutMYourgradeisaD.r,endl;elsecoutMYdurgradeisaE.Mendl;ij#includemain()Iintn;coutn=M;cinn;if(n=0&n=100&n%2=0)coutMn=nendl;elsecoutMTher,nnisoutofrange!uendl;#includeincludemain()intscore;cinb;从键盘上输入分
27、数coutMscorc=H;cinscore;用带elseif的条件语句判断处理if(scorel00)coutMThescoreisoutofrange!nendl;elseif(scorc=90)coutMYburgradeisaA/endl;elseif(score=80)coutHYourgradeisaB.Mendl;elseif(score=70)coutHYburgradeisaC”cndl：elseif(score=60)除法判断if(b!=0&a%b=0)coutbr,dividesHaendl;coutna
28、/b=,a/bendl;elsecoutbMdocsnotdivideuacndl;#includemain()x,y为操作数，c为运算符intx,y,z;charcl;cinxcIy;/c1名路选择语句选择不同衣达式计算语句main()inta,b,c;intsmallest;coutMabcnendl;cinabc;if(a=b)外层条件语句Iif(a=c)/内层条件语句smallcst=a;elsesmallest=c;elseif(b=c)内层条件语句smallest=b;elsesmallest=c;coutMSmallest=r,smal
29、lestendl;#includemain()inta,b,Max;输入数据coutna=n;cina;coutnb=N;cinb;/找出较大值Max=aba:b;coutHMax=,Maxendl;#ineludemain()inta,b;输入数据coutHa=M;cina;coutHb=M;switch(cl)case,+,:coutxM+,yn=,fx4-yendl;break;case-,:coutx,-ny=,x-ycndl;break;case,*,:coutxH*Myt=r,x*yendl;break;case:coutx,7MyM=nx/yen
31、Mouter:x=Hxendl;cou(Mouler:y=Myendl;coutMouter:w=l,wendl;/coutninner:z=Hzendl;X效coutM:x-:xendl;访问匝名的全局变At#includemain()显示l,2,3.1Ofbr(inti=l;i=l;j_)coutjH”；coutendl;显示1,3,59for(intk=l;k=10：k=k+2)coutkM”；coutcndl;显示ABC.Zfor(charc=A;c=Z;ci)coutc;coutcndl;显示0,0,0.2.1.0fbr(Hoatx=0;x=1
32、0;x=x+01)coutxHn;coutcndl;显示0,0,02l0for(floatx1=0：x1=1.0+0.1/2：x1=x1+0.1)coutxlM”；coutendl;计算s=l+2+3+100ints=0;for(intn=l;n=100;n+)s=s+n;coutns=Mscndl;ij#includemain()/计算s=1+2+3.+100ints=0,n=l;while(n=100)s=s+n：cout,s=,scndl;累加键盘输入的数据doublex,sum=0.0;cout,rx=M;cinx;while(
33、x!=0)sum+=x;coutHx=M;cinx;coutnsum=r,suTnendl;ij#includemain()计算s=l+2+3.+100ints=0tn=0;don-w-;s+=n;while(n100);coutHs=Nscndl;/累加键盘输入的数据doublex,sum=0.0;docoutnx=M;cinx;sum+=x;whilc(x!=0);coutnsum=,rsurnendl;#inchidemain()计算和打卬打印乘法九九表for(inti=1;i=9;i+)couti;for(intj=l;j=9:j+4-)coutW
34、”*HjM=Hi*j；coutendl;#includeniain()intx,sum=0;定义标号LIL1:coulv”x=”；cinx;if(x=-l)gotoL2;无条件转移语句，转到L2语句处elsesum+=x;gotoLI;无条件转移语句，转到L1语句处定义标号L2L2:coutHsum=nsumendk#includemain()/累加键盘输入的数拥doublex,sum=0.0;while(l)cout,x=,;cinx;if(xmain()inti;for(i=l;iv=20;i卄)if(i%3=0)能被3鞄除的整数，返冋进行下次循
37、15float;/从键盘I为数组赋伍/从键盘上为数组玄賦值Hifor(i=O:isize;i+)fIcoutMacinai;/对数组按从小到大顺序排序for(i=0;isizc-1;i+)for(j=i+1;jaUJ)t=ai;ai=aj；aUH；/显示排序结果for(i=0;isizc;i+)coutaiM”；coutendl;输入要査找的数拥intvalue;intfound;/找到为1,否则为0intlow,high,mid;R)r(i=l;i=3;i卄)coutMvalue=M;cinvalue;从键盘11为数组赋值for(i=0;i=4;
39、elsehigh=mid-l;9if(found)coutMTheat:anmidr,=,amidcndl;elsecoutMThe,value,tisnotfound!Hendl;for(i=0;i2;i-H-)forG=03+)coutHarvvivv”v勺=”；cinaij;显示数组afor(i=0;i2;i-w-)for(j=O;j3;j卄)coutaijHHcoutendl;找HI该数组的址大元索及其下标inth,l,Max=a00;for(i=0;i2;i+)fdr(j=O;jv3j卄)if(Maxaij)Max=afij;h=
41、;指针变就ip指向变帚aa=100;ip-&a;使指针变量ip指向变量acoutMa=naendI;coutM*ip=M*ipendl;coutHip=Mipcndl;指针变量ip指向变量bip=&b;使指针变最ip指向变最bb=200;coutMb=,fbendl;coutM*ip=H*ipcndl;coutMip=Mipendl;指针变量ip指向变杲cip=&c;使指针变量ip指向变量b*ip=a+b;coutr,c=ncendl;coutM*ip=M*ipendl;coutMip=Mipcndl;#includcmain()int*ip;从键盘上为数组a赋值for