C++經(jīng)典程序代碼

C++經(jīng)典程序代碼

〃根據(jù)半徑計(jì)算圓的周長和面積

#include<iostream.h>

constfloatPI=3.1416;〃聲明常量(只讀變量)PI為3.1416

floatfCir_L(float);〃聲明自定義函數(shù)fCir_L()的原型

floatfCir_S(float);〃聲明自定義函數(shù)fCir_S()的原型

〃以下是main。函數(shù)

main()

(

floatr,l,s;〃聲明3個變量

cout?nr=H;〃顯示字符串

cin?r;〃鍵盤輸入

l=fCir_L(r);〃計(jì)算圓的周長，賦值給變量1

s=fCir_S(r);〃計(jì)算圓的面積，賦值給變量s

cout?nl=H?l;〃顯示計(jì)算結(jié)果

cout?H\ns="?s;

〃定義計(jì)算圓的周長的函數(shù)fCir_L()

floatfCir_L(floatx)

(

floatz=-1.0;〃聲明局部變量

if(x>=0.0)〃如果參數(shù)大于0,則計(jì)算圓的周長

z=2*0I*x;

return(z);〃返回函數(shù)值

〃定義計(jì)算圓的面積的函數(shù)fCir_S()

floatfCir_S(floatx)

(

floatz=-1.0;〃聲明局部變量

if(x>=0.0)〃如果參數(shù)大于0,則計(jì)算圓的面積

Z=PI*X*X；

return(z);〃返回函數(shù)值

)

/*Program:P1-2.CPP

Writtenby:Hap

Datewritten:02:11:10

*/

#include<iostream.h>

voidmain(void)

(

doublesl,s2,s3;

sl=1.5;/*對變量si賦值*/

cout?Msl=H?s1?endl;

/*對變量s2賦值*/s2=2.5;

cout?Hs2=H?s2?endl;

s3=/*對變量s3賦值*/3.5;

cout?,,s3="?s3?endl;

cout?*,sl4-s2+s3=*,?sl4-s2+s3?endl;〃計(jì)算并顯示

〃計(jì)算并顯示cout?"sl+s2+s3="?sl+s2+s3?endl;

#include<iostream.h>

main()

(

doubler=1.0;

cout?"r="?r?endl;

double1;

1=2*3.1416*r;〃計(jì)算圓的周長，賦值給變量1

cout?"l=H?l?endl;〃顯示圓的周長

doubles=3.1416*r*r;〃計(jì)算圓的面積，賦值給變量s

cout?,,s=H?s?endl;〃顯示圓的面積

cout?nr=,*;〃顯示提示輸入的信息

cin?r;〃鍵盤輸入

1=2*3,1416*r;〃計(jì)算圓的周長，賦值給變量1

cout?nl=H?l?endl;〃顯示圓的周長

s=3.1416*r*r;

cout?"s="?s?endl;〃顯示圓的面積

}

#include<iostream.h>〃包含iostream.h頭文件

voidmain()

〃輸出字符常量、變量和字符串

charcl=W;

coutvv'W';

cout?cl?endl;

cout?"Thisisatest.H?endl;

cout?n"?endl;

〃輸出整型常量、變量和表達(dá)式

intn=100;

cout?10;

cout?n;

cout?2*n?endl;〃輸出整型表達(dá)式

cout?°"?endl;

〃輸出浮點(diǎn)型常量、變量和表達(dá)式

doublepi=3.1415926,r=10.0,s=pi*r*r;

cout?pi?endl;

cout?r;

cout?s;

cout?2*r*pi?endl;〃輸出浮點(diǎn)型表達(dá)式

cout?M"?endl;

〃一個cout可以輸出多項(xiàng)數(shù)據(jù)

cout?,W,?n"?cl?endl;

cout?"Thisisatest."?endl;

cout?npi=H?pi?Hr=n?r?ns=H?s?endl;

#include<iostream.h>〃包含iostream.h頭文件

main()

(〃輸入輸出字符

charc;

cin?c;

cout?"c="?c?endl;

〃輸入輸出整型數(shù)據(jù)

intn;

cin?n;

cout?nn=K?n?endl;

〃輸入輸出浮點(diǎn)型數(shù)據(jù)

doublex;

cin?x;

cout?Hx=H?x?endl;

〃輸入提示

cout?Mn=";

cin?n;

cout<<"n="?n?endl;

〃多項(xiàng)輸入

cout?Hcnx"?endl;

cin?c?n?x;

cout?nc=,,?c<<Mn=H?n?"x=H?x?endl;

#include<iostream.h>〃包含iostream.h頭文件

main()

,〃聲明整型變量

inta,b;

〃從鍵盤上為整型變量賦值

cout?na=°;

cin?a;

cout?nb=";

cin?b;

〃整型數(shù)的算術(shù)運(yùn)算

cout?a?"4-n?b?n="?a+b?endl;

cout?a?H-"?b?H=n?a-b?endl;

cout?a?H*,,?b?,,="?a*b?endl;

cout?a?'7H?b?H=H?a/b?endl;

cout?a?"%"?b?H=H?a%b?endl;

〃測試溢出

shortn=32767,m;//n取short類型的最大值

cout<<nn="?n?endl;

m=n+l;〃引起溢出

cout?"n+1=H?m?endl;

#include<iostream.h>〃包含iostream.h頭文件

main()

1〃聲明變量，并初始化

inta=010,b=10,c=0X10;

〃以十進(jìn)制形式顯示數(shù)據(jù)

cout?HDEC:";

cout?na=H?a;

cout?"b="?b;

cout?nc=H?c?endl;

〃以八進(jìn)制形式顯示數(shù)據(jù)

cout?"OCT:";

cout?oct;〃指定八進(jìn)制輸出

cout?"a="?a;

cout?"b="?b;

cout?nc=n?c?endl;

〃以十六進(jìn)制形式顯示數(shù)據(jù)

cout?HHEX:n;

cout?hex;〃指定十六進(jìn)制輸出

cout?Ma=n?a;

cout?nb="?b;

cout?"c=H?c?endl;

〃八、十和十六進(jìn)制數(shù)混合運(yùn)算并輸出

cout?"a+b+c=";

cout?dec;〃恢復(fù)十進(jìn)制輸出

cout?a+b+c?endl;

〃測試八、十和十六進(jìn)制輸入

cout?nDEC:a=H;cin?a;

cout?"OCT:b=n;cin?b;

cout?nHEX:a=M;cin?c;

cout?HDEC:K?dec?endl;〃指定十進(jìn)制輸出

cout?Ha="?a?endl;

cout?Hb=M?b?endl;

cout?,,c=,,?c?endl;

#include<iostream.h>〃包含沁stream.h頭文件

#include<iomanip.h>//iomanip.h頭文件包含setprecision。的定義

main()

(〃float型變量的聲明、輸入、計(jì)算和輸出

floatfx,fy;

cout?nfx=,f;

cin?fx;

cout?"fy=n;

cin?fy;

cout?fx?H4-H?fy?H=H?fx4-fy?endl;

cout?fx?"""<<fy?n=n?fx-fy?endl;

cout?fx?K*,,?fy?,,=,,?fx*fy?endl;

cout?fx?n/n?fy?H="?fx/fy?endl?endl;

//cout?fx?n%n?fy?"=n?fx%fy?endl;Error!

“double型變量的聲明、輸入、計(jì)算和輸出

floatdx,dy;

cout?Hdx=";

cin?dx;

cout?Hdy=M;

cin?dy;

cout?dx?n+n?dy?n="?dx4-dy?endl;

cout?dx?,,-n?dy?,,=,,?dx-dy?endl;

cout?dx?,,*"?dy?H=,,?dx*dy?endl;

cout?dx?,7H?dy?*,=',?dx/dy?endl?endl;

//cout?fx?,,%M?fy?',=',?fx%fy?endl;Error!

〃測試float和double類型數(shù)據(jù)的有效位

fx=10.0;fy=6.0;

floatfz=fx/fy;

dx=10.0;dy=6.0;

doubledz=dx/dy;

cout?nfz=H;

cout?setprecision(20)?fx?'7"?fy?n="?fz?endl;

cout?"dz="；

cout?setprecision(20)?dx?,7"?dy?,,=H?dz?endl?endl;;

〃float型溢出

floatx=3.5el4;

cout?"x="?x?endl;

cout?Hx*x=n?x*x?endl;

cout<v"x*x*x="<vx*x*x<<endl;

#include<iostream.h>〃包含iostream.h頭文件

main()

〃字符類型變量的聲明

charcl='A';

charc2;

〃字符數(shù)據(jù)的運(yùn)算及輸出

c2=cl+32;

cout?Mc1=,f?c1?endl;

cout?nc2=n?c2?endl;

〃輸出字符及ASCH碼

cout?cl?n:H?int(cl)?endl;

cout?c2?":"?int(c2)?endl;

cout?,$,?":',?int(,$,)?endl;

〃輸入字符

cout?nclc2H?endl;

cin?cl?c2;

cout?"cl=,,?cl?nc2="?c2?endl;

#include<iostream.h>〃包含iostream.h頭文件

main()

(

charcl=>\a\TAB=,\t';

〃陣鈴一聲

cout?cl?endl;

〃使用水平制表符

cout?1<<TAB?2?TAB?3?TAB?4?endl;

〃使用雙引號

cout?nHesaid\HThankyou\n."?endl;

〃使用回車換行

cout?"abc\n"?"def'?'\n';

)

#include<iostream.h>〃包含iostream.h頭文件

main()

(〃聲明bool變量，并初始化

boolflag1=false,flag2=true;

〃輸出布爾常量和變量

cout?Hfalse:H?false?endl;

cout?ntrue:M?true?endl;

cout?"flagl=n?flagl?endl;

cout?nflag2=n?flag2?endl;

〃布爾變量的賦值和輸出

intx=l;

flagl=x>0;〃存放關(guān)系運(yùn)算結(jié)果

cout?"flagl="?flagl?endl;

flag2=flagl;//bool類型變量相互賦值

cout?,,flag2=,,?flag2?endl;

〃布爾變量超界處理

flagl=100;

cout?"flagl="?flagl?endl;

flag2=-100;

cout?Hflag2="?flag2?endl;

)「

#include<iostream.h>

constdoublePI=3.1416;〃聲明常量(const變量)PI為3.1416

main()

(〃聲明3個變量

doubler,I,s;

〃輸入圓的半徑

cout?"r=n;

cin?r;

〃計(jì)算圓的周長

l=2*PI*r;

cout?"1=H?l?endl;

〃計(jì)算圓的面積

s=PI*r*r;

cout?"s=',?s?endl;

#include<iostream.h>

main()

{〃定義枚舉類型，并指定其枚舉元素的值

enumcolor{

RED=3,

YELL0W=6,

BLUE=9

}；

〃聲明枚舉變量a和b,并為枚舉變量a賦初值

enumcolora=RED;

colorb;〃合法，與C語言不同

//輸出枚舉常量

cout?"RED="?RED?endl;

cout?"YELLOW="?YELLOW?endl;

cout?"BLUE="?BLUE?endl;

〃枚舉變量的賦值和輸出

b=a;

a=BLUE;

cout?Ha="?a?endl;

cout?Hb="?b?endl;

//a=100;錯誤！

//a=6也錯誤!

〃枚舉變量的關(guān)系運(yùn)算

b=BLUE;//枚舉變量的賦值運(yùn)算

cout?"a<b="?(a<b)?endl;

}

#include<iostream.h>

constdoublePI=3.1416;〃聲明常量(const變量)PI為3.1416

main()

(

〃聲明3個變量

doubler=3,l,s;

〃計(jì)算圓的周長

l=2*PI*r;

cout?nl=H?l?endl;

〃計(jì)算圓的面積

s=PI*r*r;

cout?"s=H?s?endl;

〃驗(yàn)證賦值誤差

intil,is;

il=l;

is=s;

cout?Hil="?il?endl;

cout?His=H?is?endl;

)

#include<iostream.h>

main()

{

〃變量聲明

charc;

doublex,y;

〃測試自增

cout?H++EandE++:H?endl;

c='B';

cout?nc=n?+4-c?endl;〃輸出c=C

c='B,;

cout?"c="?c++?endl;〃輸出c=B

x=15*

y=5+++x;〃加號后的空格不能少

cout?ny=n?y?endl;〃輸出y=7.5

x=1.5;

y=5+x++;

cout?ny=M?y?endl;〃輸出y=6.5

cout?Mn?endl;

〃測試自減

cout?n—EandE—:M?endl;

c=B;

cout?nc=H?-c?endl;〃輸出c=A

c='B';

cout?,,c=',?c—?endl;〃輸出c=B

x=1.5;

y=5+—x;

cout?"y="?y?endl;〃輸出y=5.5

x=1.5;

y=5+x—;

cout?ny="?y?endl;〃輸出y=6.5

#include<iostream.h>

main()

(

inta=3,b=2;

〃輸出關(guān)系表達(dá)式

cout?a<b?endl;

cout?(a<b)?(a>b)?(a>=b)?(a==b)?(a!=b)?endl;

boolflag=2*a<b+10;

cout?nflag="?flag;

}.

#include<iostream.h>

main()

(

floata=3.5,b=2.1,c=0;

cout?"a=M?a?"b="?b?Hc="?c?endl;

〃與運(yùn)算

cout<<"a&&b="<<(a&&b)<<endl;〃輸出1

cout<<"a&&c="<<(a&&c)<<endl;〃輸出0

〃或運(yùn)算

cout<<"allb="<<(allb)<<endl;〃輸出1

cout<<"allc="<<(allc)<<endl;〃輸出1

〃非運(yùn)算

cout<<"!a="<<!a<<endk<"!c="<<!c<<endl;〃輸出01

〃關(guān)系運(yùn)算和邏輯運(yùn)算

boolflag=a>=0&&a<=5;〃變量a在［0,5］區(qū)間內(nèi)

cout?"a=>0&&a<=5="?flag<<endl;〃輸出1

〃算術(shù)運(yùn)算、關(guān)系運(yùn)算和邏輯運(yùn)算

cout<<"a+5>2*b+2lla<b+3="<<(a+5>2*b+2lla<b+3)<<endl;〃輸出1

}

#include<iostream.h>

main()

'〃按位與運(yùn)算

cout?"24&12="?(24&12)?endl;

〃按位異或運(yùn)算

cout?"24A12="?(24A12)?endl;

〃按位或運(yùn)算

cout?"24ll2="?(24ll2)?endl;

〃按位取反運(yùn)算

cout?"~24="?(~24)?endl;

〃左移位運(yùn)算

cout?"5?3="?(5?3)?endl;

cout?"-5?3="?(-5?3)?endl;

〃右移位運(yùn)算

cout<<H5?3=n?(5?3)?endl;

cout?n-5?3="?(-5?3)?endl;

#include<iostream.h>

main()

inta=l,b=l,c=3;

〃顯示a,b,c的值

cout?,,a=,,?a?Hb=n?b?"c=H?c?endl;

〃計(jì)算顯示(l)b+=a+2*c%5;的結(jié)果

b+=a+2*c%5;〃相當(dāng)于表達(dá)式語句b=b+(a+2*c%5);

cout?M(l)b=n?b?endl;

〃計(jì)算顯示(2)avv=c-2*b;的結(jié)果

a=1,b=1,c=3;

a?=c-2*b;//相當(dāng)于表達(dá)式語句a=a?(c-2*b);

cout?n(2)a=H?a?endl;

〃計(jì)算顯示(3)a*=b=c=3;的結(jié)果

a=l,b=l,c=3;

a*=b=c=3;〃相當(dāng)于語句組c=3;b=c;a=a*b;

cout?"(3)a=n?a?nb=H?b?"c=H?c?endl;

〃計(jì)算顯示(4)a+=b+=c;的結(jié)果

a=l,b=l,c=3;

a+=b+=c;〃相當(dāng)于語句組b=b+c;a=a+b;

cout?M(4)a=n?a?nb=H?b?"c=n?c?endl;

〃計(jì)算顯示(5)a-=b=++c+2;的結(jié)果

a=l,b=l,c=3;

a-=b=++c+2;〃相當(dāng)于語句組++c;b=b+c+2;a=a-b;

cout?M(5)a=,,?a?nb=n?b?"c=n?c?endl;

)

#include<iostream.h>

main()

(

〃用sizeof計(jì)算各類種常量的字節(jié)長度

cout?,,sizeof(,$,)=,,?sizeof(,$,)?endl;

cout?Hsizeof(1)=H?sizeof(1)?endl;

cout?nsizeof(1.5)=n?sizeof(l.5)?endl;

cout?,,sizeof(\,'Good!\H)=',?sizeof(nGood!")?endl;

〃用sizeof計(jì)算各類型變量的字節(jié)長度

inti=100;

charc='A';

floatx=3.1416;

doublep=0.1;

cout?"sizeof(i)=n?sizeof(i)?endl;

cout?nsizeof(c)=H?sizeof(c)?endl;

cout?nsizeof(x)=n?sizeof(x)?endl;

cout?"sizeof(p)=n?sizeof(p)?endl;

〃用sizeof計(jì)算表達(dá)式的字節(jié)長度

cout?"sizeof(x+1.732)="?sizeof(x+l.732)?endl;

〃用sizeof計(jì)算各類型的字節(jié)長度

cout?"sizeof(char)=H?sizeof(char)?endl;

cout?Hsizeof(int)=H?sizeof(int)?endl;

cout?Hsizeof(float)=H?sizeof(float)?endl;

cout?"sizeof(double)=M?sizeof(double)?endl;

〃用sizeof計(jì)算數(shù)組的字節(jié)長度

charstr[]="Thisisatest.";

inta[10J;

doublexy[10j;

cout?"sizeof(str)="?sizeof(str)?endl;

cout?Hsizeof(a)=n?sizeof(a)?endl;

cout?nsizeof(xy)=H?sizeof(xy)?endl;

〃用sizeof計(jì)算自定義類型的長度

structst{

shortnum;

floatmath_grade;

floatChinese_grade;

floatsum_grade;

);

ststudent1;

cout?"sizeof(st)=H?sizeofi(st)?endl;

cout?nsizeof(studentl)=H?sizeof(studentl)?endl;

)

#include<iostream.h>

main()

(〃聲明變量語句中使用順序運(yùn)算

intx,y;

〃計(jì)算中使用順序運(yùn)算

x=50;

y=(x=x-5,x/5);

cout?"x="?x?endl;

cout?,,y=,,?y?endl;

)

#include<iostream.h>

main()

(

〃測試表達(dá)式類型的轉(zhuǎn)換

intn=100,m;

doublex=3.791,y;

cout?Hn*x=n?n*x?endl;

〃賦值類型轉(zhuǎn)換

m=x;

y=n;

cout?nm=H?m?endl;

cout?ny=n<<y?endl;

〃強(qiáng)制類型轉(zhuǎn)換

cout?nint(x)=H?int(x)?endl;

cout?H(int)x=H?(int)x?endl;

cout?"int(1.732+x)="?int(1.732+x)?endl;

cout?n(int)1.732+x=n?(int)1.723+x?endl;

cout?ndouble(l00)=n?double(l00)?endl;

}.

#include<iostream.h>

main()

{

floata,b,s;

cout?nab"?endl;

cin?a?b;〃利用cin從鍵盤上為變量a,b賦值

s=a;

if(a<b){

s=b;〃if語句中只有這一個語句，可省略花括號

)

s=s*s;〃變量s中保存a,b中較大的一個數(shù)的平方

cout?Ms=n?s;

#include<iostream.h>

main()

(

intx,y;

cout?Mx=";

cin?x;

if(x<=0){〃滿足條件執(zhí)行

y=2*x;

cout?ny=n?y;〃輸出結(jié)果

)

else{〃不滿足條件執(zhí)行

y=x*x;

cout?Hy=H?y;〃輸出結(jié)果

)

)

#include<iostream.h>

main()

inta,b,c;

intsmallest;

cout?nabc',?endl;

cin?a?b?c;

if(a<=b)〃外層條件語句

if(a<=c)〃內(nèi)層條件語句

smallest=a;

else

smallest=c;

)

else

{「

if(b<=c)〃內(nèi)層條件語句

smallest=b;

else

smallest=c;

)

cout?,,Smallest=',?smallest?endl;

#include<iostream.h>

main()

(

intscore;

〃從鍵盤上輸入分?jǐn)?shù)

cout?Mscore=";

cin?score;

〃用帶elseif的條件語句判斷處理

if(score<0IIscore>100)

cout?"Thescoreisoutofrange!H?endl;

).

elseif(score>=90)

cout?HYourgradeisaA.M?endl;

elseif(score>=80)

cout?"YourgradeisaB.M?endl;

elseif(score>=70)

cout?HYourgradeisaC."?endl;

elseif(score>=60)

cout?HYourgradeisaD."?endl;

else

cout?HYourgradeisaE.H?endl;

)

#include<iostream.h>

main()

(

intn;

cout?nn=";

cin?n;

if(n>=0&&n<=100&&n%2==0)

cout?"n=H?n?endl;

else

cout?HThe"?n?"isoutofrange!H?endl;

#include<iostream.h>

main()

(

inta,b,Max;

〃輸入數(shù)據(jù)

cout?"a=n;

cin?a;

cout?nb=";

cin?b;

〃找出較大值

Max=a>b?a:b;

cout?HMax=M?Max?endl;

#include<iostream.h>

main()

(

inta,b;

〃輸入數(shù)據(jù)

cout?"a=n;

cin?a;

cout?Hb=";

cin?b;

〃除法判斷

if(b!=0&&a%b==0){

cout?b?Hdividesn?a?endl;

cout?Ha/b=H?a/b?endl;

)

else

cout?b?HdoesnotdivideM?a?endl;

#include<iostream.h>

main()

(

//x,y為操作數(shù)，c為運(yùn)算符

intx,y,z;

charcl;

cin?x?cl?y;//cl

〃多路選擇語句選擇不同表達(dá)式計(jì)算語句

switch(cl){

case,4-,:cout?x?,,+',?y?',=',?x+y?endl;

break;

case,-,:cout?x?',-',?y?,,=n?x-y?endl;

break;

case,*,:cout?x?',*,,?y?H=',?x*y?endl;

break;

case7':cout?x?,7"?y?,,=H?x/y?endl;

break;

case,%,:cout?x?"%"?y?H=H?x%y?endl;

break.

default:cout?HWrong!”vvendl;〃當(dāng)不符合上述情況Fl寸執(zhí)行本子句

#include<iostream.h>

floatx=365.5;〃聲明全局變量

main(){

intx=l,y=2;

doublew=x+y;

(

doublex=1.414,y=1.732,z=3.14;

cout?Hinner:x="?x?endl;

cout?Hinner:y=H?y?endl;

cout?Hinner:z=n?z?endl;

cout?nouter:w=H?w?endl;

cout?°::x=H?::x?endl;〃訪問重名的全局變量

)

cout?"outer:x=n?x?endl;

cout?,,outer:y=,,?y?endl;

cout?nouter:w=H?w?endl;

〃coutvv"inner:z="vvz<vendl;無效

cout?H::x=:x?endl;〃訪問重名的全局變量

}.

#include<iostream.h>

main(){

〃顯示1,2,3...10

for(inti=l;i<=10;i++)

cout?i?"n;

cout?endl;

〃顯示10,9,8…1

for(intj=10;j>=1;j—)

cout?j?Mn;

cout?endl;

〃顯示1,3,5...9

for(intk=1;k<=10;k=k+2)

cout?k?H

cout?endl;

〃顯示ABC...Z

fbr(charc=,A,;c<=,Z,;c++)

cout?c;

cout?endl;

〃顯示0,0.1,0.2...1.0

for(floatx=0;x<=1.0;x=x+0.1)

cout?x?H

cout?endl;

〃顯示001,0.2…1.0

for(floatx1=0;x1<=1.0+0.l/2;xl=x1+0.1)

cout?xl?HM;

cout?endl;

〃計(jì)算s=l+2+3...+100

ints=0;

for(intn=1;n<=100;n++)

s=s+n;

cout?ns=M?s?endl;

).

#include<iostream.h>

main()

'〃計(jì)算s=l+2+3…+100

ints=0,n=l;

while(n<=100){

s=s+n;

n++;

)

cout?ns=H?s?endl;

〃累加鍵盤輸入的數(shù)據(jù)

doublex,sum=0.0;

cout?"x=n;

cin?x;

while(x!=0){

sum+=x;

cout?"x=n;

cin?x;

)

cout?nsum=n?sum?endl;

)

#include<iostream.h>

main()

{〃計(jì)算s=1+2+3…+100

ints=0,n=0;

do{

n++;

s+=n;

}while(n<100);

cout?"s="?s?endl;

〃累加鍵盤輸入的數(shù)據(jù)

doublex,sum=0.0;

do{

cout?Mx=n;

cin?x;

sum+=x;

}while(x!=0);

cout?nsum=H?sum?endl;

)

#include<iostream.h>

main()

(

〃計(jì)算和打印打印乘法九九表

fbr(inti=l;i<=9;i++){

cout?i;

for(intj=l;j<=9;j++)

cout?endl;

#include<iostream.h>

main()

(

intx,sum=0;

〃定義標(biāo)號Ll

LI:cout?nx=n;

cin?x;

if(x==-l)

gotoL2;〃無條件轉(zhuǎn)移語句，轉(zhuǎn)至UL2語句處

else

sum+=x;

gotoLl;〃無條件轉(zhuǎn)移語句，轉(zhuǎn)到L1語句處

〃定義標(biāo)號L2

L2:cout?nsum=n?sum?endl;

#include<iostream.h>

main()

(〃累加鍵盤輸入的數(shù)據(jù)

doublex,sum=0.0;

while(l){

cout?',x=n;

cin?x;

if(x<=0)break;

sum+=x;

)

cout?"sum=n?sum?endl;

#include<iostream.h>

main()

(

inti;

for(i=l;i<=20;i++)

if(i%3==0)〃能被3整除的整數(shù)，返回進(jìn)行下次循環(huán)

continue;

cout?i?Hn;

)

cout?endl;

}

#include<iostream.h>

main()

(〃聲明數(shù)組和變量

inta[5],i,sum;

doubleavg;

〃從鍵盤上循環(huán)為數(shù)組賦值

for(i=0;i<5;i++){

cout?"a["?i<<"]=";

cin?a[i];

)

〃直接顯示數(shù)組元素

cout?a[0]?a[lJ?a[2]?a[3]?a[4]?endl;

〃利用for循環(huán)顯示數(shù)組各元素的值

for(i=0;i<5;i++)

cout?a[i]?n

cout?endl;

〃計(jì)算數(shù)組元素之和，并顯示計(jì)算結(jié)果

sum=a[0]+a[1]+a[2]4-a[3]+a[4];

cout?Hsum=,,?sum?endl;

〃利用循環(huán)計(jì)算數(shù)組的累加和

for(sum=0,i=0;i<5;i++)

sum+=a[i];

〃顯示累加和及平均值

cout?Hsum=n?sum?endl;

avg=sum/5.0;

cout?navg=H?avg?endl;

)一

#include<iostream.h>

main()

(

inti,max,index,a[5];

〃從鍵盤上為數(shù)組賦值

for(i=0;i<=4;i++)

(

cout?"a["?i?"]=";

cin?a[i];

)

//利用循環(huán)遍歷數(shù)組，找出最大值的元素及其下標(biāo)

max=a[0J;

for(i=0;i<=4;i++)

(

if(max<a[ij)

{

max=a[i];

index=i;

cout?n\nMax=H?max?Hindex="?index;

)

#include<iostream.h>

#definesize5

main()

(〃聲明變量

inti,j;

floatt,a[size];

〃從牌盤上為期組賦值

for(i=0;i<size;i++)

(

cout?"a["?i?"l="；

cin?a[i];

)

〃對數(shù)組按從小到大順序排序

for(i=O;i<size-l;i++)

for(j=i+l;j<size;j++)

if(a[i]>a[j])

(

t=a[i];

a[i]=a[j];

a[j]=t;

)

〃顯示排序結(jié)果

for(i=0;i<size;i++)

cout?a[i]?"°;

cout?endl;

〃輸入要查找的數(shù)據(jù)

intvalue;

intfound;〃找到為1,否則為0

intlow,high,mid;

for(i=l;i<=3;i++){

cout?nvalue=";

cin?value;

〃二分法杳找數(shù)組a

found=0;

low=0;

high=size-l;

while(low<=high)

{-

mid=(high+low)/2;

if(a[midj==value)

(

found=l;

break;

)

if(a[midj<value)

low=mid+1;

else

high=mid-l;

if(found)

cout?HThevalufoundat:a[H?mid?nJ=H?a[mid]?endl;

else

cout?"The"?value?"isnotfound!"?endl;

#include<iostream.h>

main()

(

〃聲明變量

inti,j;

floatt,a[5];

〃從鍵盤上為數(shù)組賦值

for(i=0;i<=4;i++)

(

cout?"a["?i<<"]=";

cin?a[i];

〃對數(shù)組按從大到小順序排序

for(i=0;i<=3;i++)

for(j=i+l;j<=4;j++)

if(a[i]<=aUJ)

(

t=a[i];

a[ij=a[j];

afj]=t;

〃顯示排序結(jié)果

for(i=0;i<=4;i++)

cout?a[i]?"

)

#include<iostream.h>

main()

,〃聲明二維數(shù)組及變量

inta[2][3],i,j;

〃從鍵盤上為數(shù)組a賦值

for(i=0;i<2;i++)

for(j=O;j<3;j++)

(

cout?"a["?i?"]["?j?"]=";

cin?a[i][jj;

)

〃顯示數(shù)組a

for(i=0;i<2;i++){

for(j=O;j<3;j++)

(

cout?a[i]UJ?"

}

cout?endl;

〃找出該數(shù)組的最大元素及其下標(biāo)

inth,l,Max=a[O][OJ;

for(i=0;i<2;i++){

for(j=O;j<3;j++)

(

if(Max<ari][j]){

Max=a[iJ[jJ;

h=i;

l=j;

cout?"Max:"?"a["?h?"]["?l?"]="?a[h][l]?endl;

}

#include<iostream.h>

main()

(

〃聲明字符數(shù)組和變量

charstr[6J;

inti;

〃從鍵盤上輸入字符串

cout?Mstr=";

cin?str;

cout?str?endl;

〃按數(shù)組和下標(biāo)變量兩種方式顯示字符數(shù)組

cout?str?endl;

for(i=0;i<6;i++)

cout?str[i];

cout?endl;

〃字符串反向輸出

for(i=5;i>=0;i—)

cout?str[i];

cout?endl;

〃將字符數(shù)組變成大寫字母后輸出

for(i=0;i<=5;i++)

str[i]-=32;〃小寫字母轉(zhuǎn)換成大寫字母

cout?str?endl;〃顯小字符串

)

#include<iostream.h>

main()

(〃聲明變量和指針變量

inta,b,c,*ip;

〃指針變量ip指向變量a

a=100;

ip=&a;〃使指針變量ip指向變量a

cout?na=M?a?endl;

coutvv"*ip="vv*ipvvendl;

cout?Hip="?ip?endl;

〃指針變量ip指向變量b

ip=&b;//使指針變量ip指向變量b

b=200;

cout?"b="?b?endl;

cout?"*ip="?*ip?endl;

cout?Hip=H?ip?endl;

〃指針變量ip指向變量c

ip=&c;〃使指針變量ip指向變量b

*ip=a+b;

cout?nc=n?c?endl;

cout?***ip=',?*ip?endl;

cout?"ip=n?ip?endl;

}

#include<iostream.h>

main()

(

〃聲明數(shù)組、變量和指針變量

inta[2][3],i,j;

int*ip;

〃從鍵盤上為數(shù)組a賦值

for(i=0;i<2;i++)〃為數(shù)組a賦值

for(j=O;j<3;j++)

(

cout?"a["?i?"]["?j<<"]=";

cin?a[i][jj；

〃利用下標(biāo)變量顯示數(shù)組a

for(i=0;i<2;i++){

for(j=O;j<3;j++)

(

cout?a[i][j]?"'

)

cout?endl;

〃利用指針變量顯示數(shù)組a

ip=&afO]rO];

for(i=0;i<2;i++){

forQ=O;j<3;j++)

(

cout?"a["?i?"]["?j?"J=";

cout?ip?"

cout?*ip?endl;

ip++；

)

)

)

#include<iostream.h>

main()

1〃聲明數(shù)組、變量和指針變量

inta[]={12,3,4,5,6};

int*ipl,*ip2;

〃測試指針的賦值運(yùn)算

ipl=a;

ip2=ipl;

cout?n*ip1=n?(*ip1)?endl;

cout?*,*ip2=*,?(*ip2)?endl;

〃測試指針的自增自減運(yùn)算和組合運(yùn)算

ipl++；

ip2+=4;

cout?H*ip1=n?(*ip1)?endl;

cout?n*ip2=n?(*ip2)?endl;

〃測試.指的變量之間的關(guān)系運(yùn)算

intn=ip2>ipl;

cout?"ip2>ipl=H?n?endl;

cout?Hip2!=NULL=H?(ip2!=NULL)?endl;

/侑針變量之間的減法

n=ip2-ipl;

cout?nip2-ipl=H?n?endl;

)

#include<iostream.h>

main()

〃聲明字符型數(shù)組和指針變量

charstr[10];

char*strip=str;

〃輸入輸出

cout?"str=n;

cin?str;〃用字符數(shù)組輸入字符串

cout?,,str=H?str?endl;

cout?nstrip=H?strip?endl;

cout?nstrip=n;

cin?strip;〃用字符指針變量輸入字符串

cout<<"str="?str?endl;

cout?Hstrip=n?strip?endl;

〃利用指針變量改變其指向字符串的內(nèi)容

*(strip+2)=T;

cout?,,str=H?str?endl;

cout?"strip="?strip?endl;

〃利態(tài)為字符型指針變量分配內(nèi)存

strip=newchar(lOO);

cout?nstrip=n;

cin?strip;〃用字符指針變量輸入字符串

cout?"str=H?str?endl;

cout?,,strip=,,?strip?endl;

}.

#include<iostream.h>

main()

(

//聲明用于存放運(yùn)動員號碼的數(shù)組

inth[J={1001,1002,1003,1004);

//聲明用于存放運(yùn)動員成績的數(shù)組

floatx[J={12.3,13.1,11.9,12.1);

〃聲明用于存放運(yùn)動姓名的字符型指針數(shù)組

char*p[l={"Wanghua","Zhangjian","Liwei","Huaming"};

//i,j,it是用做循環(huán)控制變量和精時(shí)變量

int

//ft用做暫存變量

floatft;

//pt為字符型指針變量用做暫存指針變量

char*pt;

〃用選擇法對數(shù)組X進(jìn)行排序，并相應(yīng)調(diào)整數(shù)組h和p中的數(shù)據(jù)

for(i=0;i<=3;i++)

for(j=i+l;j<=3;j++)

if(x[i]>=x[jj){

ft=x[i],x[i]=x[j],xfj]=ft;

it=h[i],h[i]=h[j],h[j]=it;

pt=p[iJ,p[iJ=p[j],pLjJ=pt；

〃以下打印排序結(jié)果

for(i=0;i<=3;i++)

cout?h[iJ?M,"?p[iJ?M,H?x[iJ?endl;

)

#include<iostream.h>

main()

(

〃聲明指針數(shù)組

char*colors[]={"Red","Blue","Yellow","Green");

〃指向指針的指針變量

char**pt;

〃通過指向指針的變量訪問其指向的內(nèi)容

pt=colors;

for(inti=0;i<=3;i++){

cout?Hpt=M?pt?endl;

cout?M*pt=H?*pt?endl;

cout?,,**pt=,,?**pt?endl;

pt++;

)

)

#include<iostream.h>

main()

{〃定義結(jié)構(gòu)類型

structbooks

(

chartitle[20];

charauthor[15];

intpages;

floatprice;

};

〃聲明結(jié)構(gòu)變量

structbooksZbk={"VC++","Zhang",295,35.5};

booksWbk;

〃對結(jié)構(gòu)變量的輸出

cout?"Zbk:"vvend1;

cout?Zbk.title?endl;

cout?Zbk.author?endl;

cout?Zbk.pages?endl;

cout?Zbk.price?endl;

cout?Hn?endl;

〃對結(jié)構(gòu)成員的運(yùn)算

Zbk.pages+=10;

Zbk.price+=0.5;

cout?"Zbk.pages="?Zbk.pages?endl;

cout?nZbk.price=H?Zbk.price?endl;

cout?MM?endl;

〃對結(jié)構(gòu)變量的輸入輸出

cout?HWbk.title='*;

cin?Wbk.title;

cout?nWbk.author=";

cin?Wbk.author;

cout?HWbk.pages=";

cin?Wbk.pages;

cout?"Wbk.price=";

cin?Wbk.price;

cout?HWbk:"vvendl;

cout?Wbk.title?endl;

cout?Wbk.author?endl;

cout?Wbk.pages?endl;

cout?Wbk.price?endl;

cout?n"?endl;

〃結(jié)構(gòu)變量之間的相互賦值

bookstemp;

temp=Wbk;

cout?Htemp:"?endl;

cout?temp.title?endl;

cout?temp.author?endl;

cout?temp.pages?endl;

cout?temp.price?endl;

#include<iostream.h>

main()

(

inti;

〃定義結(jié)構(gòu)類型

structstudent{

intnum;

charname[10];

floatmaths;

floatphysics;

floatchemistry;

doubletotal;

)；

//聲明結(jié)構(gòu)數(shù)組st

s