C++经典代码大全

1、/根据半径计算圆的周长和面积 #include const float Pl=3.1416;/声明常量(只读变量)PI 为 3.1416 float fCir_L(float);声明自定义函数fCir_L()的原型 float fCir_S(float);/声明自定义函数 fCir_S()的原型 /以下是main()函数 main() float r,l,s; /声明3个变量 double l; l=2*3.1416*r; coutvvl=vv|vvendl; double s=3.1416*r*r; coutvvs=vvsvve ndl; /计算圆的周长，赋值给变量l /显示圆的周长 /计算

2、圆的面积，赋值给变量 s /显示圆的面积 coutr; l=fCir_L(r); s=fCir_S(r); coutvvl=vv|; coutvns=vr; l=2*3.1416*r; coutvvl=vv|vvendl; s=3.1416*r*r; coutvvs=vvsvve ndl; /显示提示输入的信息 /键盘输入 /计算圆的周长，赋值给变量l /显示圆的周长 /显示圆的面积 #include viostream.h/包含 iostream.h 头文件 /定义计算圆的周长的函数 float fCir_L(float x) float z=-1.0; if (x=0.0) z=2*PI*

3、x; return(z); fCir_L() 声明局部变量 /如果参数大于0,则计算圆的周长 /返回函数值 定义计算圆的面积的函数fCir_S() float fCir_S(float x) float z=-1.0;/声明局部变量 if (x=0.0)/如果参数大于0,则计算圆的面积 z=PI*x*x; return(z);返回函数值 /* Program: P1-2.CPP Written by: Hap Date written: 02:11:10 */ #include viostream.h void main(void) double s1,s2,s3; s1=1.5;/*对变量s

4、1赋值*/ coutvvs1=vvs1vvendl; /*对变量s2赋值*/s2=2.5; coutvvs2=vvs2vvendl; s3= /*对变量s3赋值*/3.5; coutvvs3=vvs3vvendl; coutvvs1+s2+s3=vvs1+s2+s3vvendl;/ 计算并显 示 计算并显示 coutvvs1+s2+s3=vvs1+s2+s3vvendl; #include viostream.h main() double r=1.0; coutvvr=vvrvve ndl; void main() /输岀字符常量、变量和字符串 char c1=A： coutvvW; cou

5、tvvc1vvendl; coutvvThis is a test.vvendl; coutvvvvendl; /输岀整型常量、变量和表达式 int n=100; coutvv10; coutvvn; cout2*nvvendl;/输出整型表达式 coutvvvvendl; 输岀浮点型常量、变量和表达式 double pi=3.1415926,r=10.0,s=pi*r*r; coutvvpivvendl; coutvvr; coutvvs; cout2*r*pivvendl;输出浮点型表达式 coutvvvvendl; 一个cout可以输出多项数据 coutvvWvv vvc1vvendl;

6、 coutvvThis is a test.vvendl; coutvvpi=vvpivv r=vvrvv s=vvsvve ndl; #include viostream.h包含 iostream.h 头文件 main() /输入输岀字符 char c; cinc; coutvvc=vvcvve ndl; /输入输岀整型数据 int n; cinn; coutv vn=vvnvven dl; /输入输岀浮点型数据 double x; cinx; coutvvx=vvxvve ndl; 7 /输入提示 cout vn=; cinn; coutcnx; coutvvc=vvcvv n=vvnvv

7、 x=vvxvve ndl; #include viostream.h包含 iostream.h 头文件 main() /声明整型变量 int a,b; /从键盘上为整型变量赋值 coutvva=; cina; coutvvb=; cinb; /整型数的算术运算 coutvvavv+vvbvv=vva+bvve ndl; coutvvavv-vvbvv=vva-bvve ndl; coutvvavv*vvbvv=vva*bvve ndl; coutvvavv/vvbvv=vva/bvve ndl; coutvvavv%vvbvv=vva%bvvendl; 测试溢岀 short n=32767,

8、m;/n 取 short 类型的最大值 coutv vn=vvnvven dl; m=n+1;/引起溢出 coutvvn+1=vvmvvendl; #include viostream.h包含 iostream.h 头文件 main() /声明变量，并初始化 int a=010,b=10,c=0X10; 以十进制形式显示数据 coutvvDEC:; coutvv a=vva; coutvv b=vvb; coutvv c=vvcvve ndl; 以八进制形式显示数据 coutvvOCT:; coutvvoct;指定八进制输出 coutvv a=vva; coutvv b=vvb; coutvv

9、 c=vvcvve ndl; 以十六进制形式显示数据 coutvvHEX:; coutvvhex;/指定十六进制输出 coutvv a=vva; coutvv b=vvb; cout c=vca; coutvvOCT:b=; cinb; coutvvHEX:a=; cinc; coutvvDEC:vvdecvvendl;/指 定十进制输出 coutvva=vvavve ndl; coutvvb=vvbvve ndl; coutvvc=vvcvve ndl; #include viostream.h包含 iostream.h 头文件 #includeviomanip.h / iomanip.h

10、头文件包含 setprecision()的 定义 main() /float型变量的声明、输入、计算和输出 float fx,fy; coutvvfx=; cinfx; coutvvfy=; cinfy; coutvvfxvv+vvfyvv=vvfx+fyvve ndl; coutvvfxvv-vvfyvv=vvfx-fyvvendl; coutvvfxvv*vvfyvv=vvfx*fyvvendl; coutvvfxvv/vvfyvv=vvfx/fyvve ndle ndl; /coutvvfxvv%vvfyvv=vvfx%fyvvendl; Error! /double型变量的声明、输入、

11、计算和输出 float dx,dy; coutvvdx=; cindx; coutvvdy=; cindy; coutvvdxvv+vvdyvv=vvdx+dyvve ndl; coutvvdxvv-vvdyvv=vvdx-dyvve ndl; coutvvdxvv*vvdyvv=vvdx*dyvve ndl; coutvvdxvv/vvdyvv=vvdx/dyvve ndlvve ndl; /coutvvfxvv%vvfyvv=vvfx%fyvvendl; Error! 测试float和double类型数据的有效位 fx=10.0;fy=6.0; float fz=fx/fy; dx=10.

12、0;dy=6.0; double dz=dx/dy; coutvvfz=; coutvvsetprecisi on( 20)vvfxvv/vvfyvv=vvfzvve ndl; coutvvdz=; coutvvsetprecision(20)vvdxvv/vvdyvv=vvdzvvendlvvendl; /float型溢出 float x=3.5e14; coutvvx=vvxvve ndl; coutvvx*x=vvx*xvve ndl; cout包含 iostream.h 头文件 main() 字符类型变量的声明 char c1=A： char c2; /字符数据的运算及输岀 c2=c1

13、+32; coutvvc1=vvc1vvendl; coutvvc2=vvc2vvendl; /输出字符及ASCII码 coutvvclvv : vvint(c1)vvendl; coutvvc2vv : vvint(c2)vvendl; coutvv$vv : vvint($)vvendl; /输入字符 coutvvc1 c2vvendl; cinc1c2; coutvvc1=vvc1vv c2=vvc2vvendl; #include viostream.h包含 iostream.h 头文件 main() char c1=a,TAB=t; 阵铃一声 coutvvclvvendl; /使用水

14、平制表符 C0utvv1vvTABvv2vvTABvv3vvTABvv4vvendl; 使用双引号 coutvvHe said Thank you.vvendl; /使用回车换行 coutvvabcnvvdefvvn; #include viostream.h包含 iostream.h 头文件 main() /声明bool变量，并初始化 bool flag1=false,flag2=true; /输岀布尔常量和变量 coutvvfalse:vvfalsevvendl; coutvvtrue: vvtruevvendl; coutvvflag1=vvflag1vvendl; coutvvflag

15、2=vvflag2vvendl; /布尔变量的赋值和输岀 int x=1; flag仁x0;/存放关系运算结果 coutvvflag1=vvflag1vvendl; flag2=flag1; /bool类型变量相互赋值 coutvvflag2=vvflag2vvendl; 布尔变量超界处理 flag1=100; coutvvflag1=vvflag1vvendl; flag2=-100; coutvvflag2=vvflag2vvendl; #include viostream.h const double Pl=3.1416;/声明常量(const 变量)PI 为 3.1416 main()

16、 声明3个变量 double r,l,s; /输入圆的半径 coutvvr=; cinr; /计算圆的周长 l=2*PI*r; coutvvl=vv|vvendl; /计算圆的面积 s=PI*r*r; coutvvs=vvsvve ndl; #includeviostream.h main() /定义枚举类型，并指定其枚举元素的值 enum color RED=3, YELLOW=6, BLUE=9 ; 声明枚举变量a和b,并为枚举变量a赋初值 enum color a=RED; color b;/合法，与C语言不同 /输出枚举常量 coutvvRED=vvREDvvendl; coutvvY

17、ELLOW=vvYELLOWvvendl; coutvvBLUE=vvBLUEvvendl; /枚举变量的赋值和输岀 b=a; a=BLUE; coutvva=vvavve ndl; coutvvb=vvbvve ndl; a=100;错误！ /a=6也错误！ /枚举变量的关系运算 b=BLUE;/枚举变量的赋值 运算 coutvvavb=vv(avb)vve ndl; #include viostream.h /声明常量（const变量）PI为3.1416 /输岀c=C /输岀c=B /加号后的空格不能少 输出y=7.5 输出y=6.5 vvendl; int a=3, b=2; /计算显示

18、（1） b+=a+2*c%5;的结果 const double Pl=3.1416; main() 声明3个变量 double r=3,l,s; 计算圆的周长 l=2*p|*r; coutvl=vv|vendl; 计算圆的面积 s=PI*r*r; coutvs=v main() 变量声明 char c; double x,y; 测试自增 coutvv+E and E+ :vvendl; c=B; coutvvc=vv+cvvendl; c=B; coutvvc=vvc+vvendl; x=1.5; y=5+ +x; coutvvy=vvyvve ndl; x=1.5; y=5+x+; cout

19、vvy=vvyvve ndl; coutvv /测试自减 coutvv-E and E- :vvendl; c=B; coutvvc=vv-cvvendl;/输出 c=A c=B; coutvvc=vvc-vvendl;/输出 c=B x=1.5; y=5+-x; coutvvy=vvyvvendl;输出 y=5.5 x=1.5; y=5+x-; coutvvy=vvyvvendl;输出 y=6.5 #include viostream.h main() /输岀关系表达式 coutvvavbvvendl; coutvv(avb)vv(ab)vv(a=b)vv(a=b)vv(a!=b)vvend

20、l; bool flag=2*avb+10; coutvvflag=vvflag; #include viostream.h main() float a=3.5,b=2.1,c=0; coutvva=vvavv b=vvbvv c=vvcvve ndl; /与运算 coutvva 输出 1 coutvva 输出 0 或运算 coutvva|b=vv(a|b)vvendl; 输出 1 coutvva|c=vv(a|c)vvendl; 输出 1 /非运算 coutvv!a=vv!avvendlvv!c=vv!cvvendl;输出 0 1 /关系运算和逻辑运算 bool flag=a=0 /变量

21、a 在0,5区间内 coutvva=0 输出 1 /算术运算、关系运算和逻辑运算 coutvva+52*b+2|avb+3=vv(a+52*b+2|avb+3)vvendl; 输岀1 #include viostream.h main() /按位与运算 coutvv24 /按位异或运算 coutvv24A12=vv(24A12)vvendl; /按位或运算 coutvv24|12=vv(24|12)vvendl; /按位取反运算 coutvv24=vv(24)vvendl; /左移位运算 coutvv5vv3=vv(5vv3)vvendl; coutvv-5vv3=vv(-5vv3)vvend

22、l; /右移位运算 coutvv53=vv(53)vvendl; coutvv-53=vv(-53)vvendl; #include viostream.h main() int a=1,b=1,c=3; /显示a,b,c的值 coutvva=vvavv b=vvbvv c=vvcvve ndl; b+=a+2*c%5;/相当于表达式语句 b=b+(a+2*c%5); cout(1) b=vbve ndl; 计算显示(2) a=c-2*b;的结果 a=1,b=1,c=3; a=c-2*b;/ 相当于表达式语句a=a(c-2*b); cout(2) a=vave ndl; 计算显示a*=b=c=

23、3;的结果 a=1,b=1,c=3; a*=b=c=3;/ 相当于语句组 c=3;b=c;a=a*b; cout(3) a=vavb=vbv c=vc main() 用sizeof计算各类种常量的字节长度 coutvvsizeof($)=vvsizeof($)vvendl; coutvvsizeof(1)=vvsizeof(1)vvendl; coutvvsizeof(1.5)=vvsizeof(1.5)vvendl; coutvvsizeof(Good!)=vvsizeof(Good!)vvendl; 用sizeof计算各类型变量的字节长度 int i=100; char c=A; floa

24、t x=3.1416; double p=0.1; coutvvsizeof(i)=vvsizeof(i)vvendl; coutvvsizeof(c)=vvsizeof(c)vvendl; coutvvsizeof(x)=vvsizeof(x)vvendl; coutvvsizeof(p)=vvsizeof(p)vvendl; 用sizeof计算表达式的字节长度 coutvvsizeof(x+1.732)=vvsizeof(x+1.732)vvendl; /用 sizeof计算各类型的字节长度 coutvvsizeof(char)=vvsizeof(char)vvendl; coutvvsi

25、zeof(int)=vvsizeof(int)vvendl; coutvvsizeof(float)=vvsizeof(float)vvendl; coutvvsizeof(double)=vvsizeof(double)vvendl; 用sizeof计算数组的字节长度 char str=This is a test.; int a10; double xy10; coutvvsizeof(str)=vvsizeof(str)vvendl; coutvvsizeof(a)=vvsizeof(a)vvendl; coutvvsizeof(xy)=vvsizeof(xy)vvendl; /用siz

26、eof计算自定义类型的长度 struct st short num; float math_grade; float Chinese_grade; float sum_grade; ; st studentl; coutvvsizeof(st)=vvsizeof(st)vvendl; coutvvsizeof(student1)=vvsizeof(student1)vvendl; #include viostream.h main() 声明变量语句中使用顺序运算 int x, y; /计算中使用顺序运算 x=50; y=(x=x-5, x/5); coutvvx=vvxvve ndl; cou

27、tvvy=vvyvve ndl; #include viostream.h main() 测试表达式类型的转换 int n=100,m; double x=3.791,y; coutv vn *x= vvn *xe ndl; /赋值类型转换 m=x; y=n; coutvvm=vvmvve ndl; coutvvy=vvyvve ndl; /强制类型转换 coutvvint(x)=vvint(x)vvendl; coutvv(i nt)x=vv(i nt)xvve ndl; coutvvint(1.732+x)=vvint(1.732+x)vvendl; coutvv(int)1.732+x=

28、vv(int)1.723+xvvendl; coutvvdouble(100)=vvdouble(100)vvendl; #include viostream.h main() float a,b,s; coutvva bvvendl; cinab; /利用cin从键盘上为变量a,b赋值 s=a; if (avb) s=b;/if语句中只有这一个语句，可省略花括 号 s=s*s;/变量s中保存a,b中较大的一个数的平方 coutvvs=vvs; 满足条件执行 输岀结果 /不满足条件执行 /输岀结果 cvvendl; /外层条件语句 /内层条件语句 #include main() int x,y

29、; coutx; if (x=0) y=2*x; coutvy=vvy; else y=x*x; cout main() int a,b,c; int smallest; coutvva b cinabc; if (av=b) if (av=c) smallest=a; else smallest=c; else if (bv=c)内层条件语句 smallest=b; else smallest=c; coutvvSmallest=vvsmallestvvendl; #include viostream.h main() int score; 从键盘上输入分数 coutvvscore=; ci

30、nscore; 用带else if的条件语句判断处理 if (scorevO | score100) coutvvThe score is out of range!vvendl; else if (score=90) coutvvYour grade is a A.vvendl; else if (score=80) coutvvYour grade is a B.vvendl; else if (score=70) coutvvYour grade is a C.vvendl; else if (score=60) coutvvYour grade is a D.vvendl; else

31、coutvvYour grade is a E.vvendl; #include viostream.h main() int n; coutv vn=; cinn; if (n=0 else coutvvThe vvnvv is out of range!vvendl; #include viostream.h main() int a,b,Max; II输入数据 coutvva=; cina; coutvvb=; cinb; II找岀较大值 Max=ab?a:b; coutvvMax=vvMaxvvendl; #include viostream.h main() int a,b; II输

32、入数据 coutvva=; cina; coutvvb=; cinb; II除法判断 if (b!=0 coutvva/b=vva/bvvendl; else coutvvbvv does not divide vvavvendl; #include viostream.h main() IIx,y为操作数，c为运算符 int x,y,z; char c1; cinxc1y; IIc1 多路选择语句选择不同表达式计算语句 switch(cl) case +：coutvvxvv+vvyvv=v float x=365.5;/声明全局变量 main() int x=1,y=2; double w=

33、x+y; double x=1.414,y=1.732,z=3.14; coutvvinner:x=vvxvvendl; coutvvinner:y=vvyvvendl; coutvvinner:z=vvzvvendl; coutvvouter:w=vvwvvendl; coutvv:x=vv：:xvvendl;/访问重名的全局变量 coutvvouter:x=vvxvvendl; coutvvouter:y=vvyvvendl; coutvvouter:w=vvwvvendl; coutvvinner:z=vvzvvendl;无效 coutvv:x=vv：:xvvendl;/访问重名的全局变

34、量 #includeviostream.h main() 显示 1,2,3.1O for(int i=1;iv=10;i+) coutvvivv; coutvvendl; 显示 10,9,8.1 for(int j=1O;j=1;j-) coutvvjvv; coutvvendl; 显示 1,3,5.9 for(int k=1;kv=10;k=k+2) coutvvkvv; coutvvendl; 显示 ABC.Z for(char c=A;cv=Z;c+) coutvvc; coutvvendl; /显示 0,0.1,02.1.0 for(float x=0;xv=1.0;x=x+0.1)

35、coutvvxvv; coutvvendl; /显示 0,0.1,02.1.0 for(float x1=0;x1v=1.0+0.1/2;x 1=x1+0.1) coutvvxlvv; coutvvendl; 计算 s=1+2+3.+100 int s=0; for(int n=1;nv=100;n+) s=s+n; coutvvs=vvsvve ndl; #includeviostream.h main() 计算 s=1+2+3.+100 int s=0,n=1; while(nv=100) s=s+n; n+; coutvvs=vvsvve ndl; /累加键盘输入的数据 double x

36、,sum=0.0; coutvvx=; cinx; while(x!=0) sum+=x; coutvvx=; cinx; coutvvsum=vvsumvvendl; #includeviostream.h main() 计算 s=1+2+3.+100 int s=0,n=0; do n+; s+=n; while(nv100); coutvvs=vvsvve ndl; /累加键盘输入的数据 double x,sum=0.0; do coutvvx=; cinx; sum+=x; while(x!=0); coutvvsum=vvsumvvendl; #includeviostream.h

37、double avg; /从键盘上循环为数组赋值 for (i=0;iv5;i+) coutvvavvivv=; cinai; /直接显示数组元素 coutvva0vva1vva2vva3vva4vvendl; /利用for循环显示数组各元素的值 for (i=0;iv5;i+) coutvvaivv; coutvvendl; 计算数组元素之和，并显示计算结果 sum=a0+a1+a2+a3+a4; coutvvsum=vvsumvvendl; /利用循环计算数组的累加和 for (sum=0,i=0;iv5;i+) sum+=ai; 显示累加和及平均值 coutvvsum=vvsumvven

38、dl; avg=sum/5.0; coutvvavg=vvavgvve ndl; #includeviostream.h main() int i,max,index,a5; /从键盘上为数组赋值 for (i=0;iv=4;i+) coutvvavvivv=; cinai; /利用循环遍历数组，找岀最大值的元素及其下标 max=a0; for (i=0;iv=4;i+) if (maxvai) max=ai; index=i; coutvvnMax=vvmaxvv index=vvindex; #includeviostream.h #define size 5 main() 声明变量 in

39、t i,j; float t,asize; main() 计算和打印打印乘法九九表 for (int i=1;i=9;i+) coutvvi; for (int j=1;jv=9;j+) coutvvtvvivv*vvjvv=vvi*j； coutvvendl; #include main() int x,sum=0; 定义标号L1 L1: coutx; if (x=-1) goto L2;/无条件转移语句，转到L2语句处 else sum+=x; goto L1;无条件转移语句，转到L1语句处 /定义标号L2 L2: cout main() /累加键盘输入的数据 double x,sum=0

40、.0; while(1) coutvvx=; cinx; if (xv=0) break; sum+=x; coutvvsum=vvsumvvendl; #includeviostream.h main() int i; for (i=1;iv=20;i+) if (i%3=0)/能被3整除的整数，返回进行下次循 环 continue; coutvvivv; coutvvendl; /声明数组和变量 int a5,i,sum; #includeviostream.h main() 9 从键盘上为数组赋值 for (i=O;isize;i+) coutvavvivv=; cinai; 对数组按从

41、小到大顺序排序 for (i=0;isize-1;i+) for (j=i+1;jaj) t=ai; ai=aj; aj=t; 显示排序结果 for (i=0;isize;i+) coutaivv; coutvvendl; /输入要查找的数据 int value; int found;找到为1,否则为0 int low,high,mid; for (i=1;i=3;i+) coutai; /对数组按从大到小顺序排序 for (i=0;iv=3;i+) for (j=i+1;jv=4;j+) if (aiv=aj) t=ai; ai=aj; aj=t; /显示排序结果 for (i=0;iv=4

42、;i+) coutvvaivv; #includeviostream.h main() 声明二维数组及变量 int a23,i,j; /从键盘上为数组a赋值 for (i=0;iv2;i+) for (j=0;jv3;j+) coutvvavvivvvvjvv=; cinaij; /显示数组a for (i=0;iv2;i+) for (j=0;jv3;j+) coutvvaijvv ; coutvvendl; /找岀该数组的最大元素及其下标 int h,l,Max=a00; for (i=0;iv2;i+) for (j=0;jv3;j+) if (Maxvaij) Max=aij; h=i

43、; l=j; coutvvMax:vvavvhvvvv|vv=vvahlvvendl; #includeviostream.h main() 11 #include main() 声明字符数组和变量 char str6; int i; 从键盘上输入字符串 coutstr; coutvvstrvvendl; 按数组和下标变量两种方式显示字符数组 coutvvstrvvendl; for (i=0;iv6;i+) coutvvstri; coutvvendl; /字符串反向输岀 for (i=5;i=0;i-) coutvvstri; coutvvendl; 将字符数组变成大写字母后输岀 for

44、(i=0;iv=5;i+) stri-=32;/小写字母转换成大写字母 coutvvstrvvendl;/ 显示字符串 #includeviostream.h main() /声明变量和指针变量 int a,b,c,*ip; 指针变量ip指向变量a a=100; ip=/使指针变量ip指向变量a coutvva=vvavve ndl; coutvv*ip=vv*ipvve ndl; coutvvip=vvipvve ndl; 指针变量ip指向变量b ip=使指针变量ip指向变量b b=200; coutvvb=vvbvve ndl; coutvv*ip=vv*ipvve ndl; coutvv

45、ip=vvipvve ndl; 指针变量ip指向变量c ip=/使指针变量ip指向变量b *ip=a+b; coutvvc=vvcvve ndl; coutvv*ip=vv*ipvve ndl; coutvvip=vvipvve ndl; #includeviostream.h main() /声明数组、变量和指针变量 int a23,i,j; int* ip; /从键盘上为数组a赋值 for (i=0;iv2;i+)/为数组 a 赋值 for (j=0;jv3;j+) coutvvavvivvvvjvv=; cinaij; 利用下标变量显示数组a for (i=0;iv2;i+) for (

46、j=0;jv3;j+) coutvvaijvv ; coutvvendl; 利用指针变量显示数组a ip= for (i=0;iv2;i+) for (j=0;jv3;j+) coutvvavvivvvvjvv=; coutvvipvv ; coutvv*ipvvendl; ip+; #includeviostream.h main() 声明数组、变量和指针变量 int a=1,2,3,4,5,6; int *ip1,*ip2; 测试指针的赋值运算 ip1=a; ip2=ip1; coutvv*ip1=vv(*ip1)vve ndl; coutvv*ip2=vv(*ip2)vvendl; 测试

47、指针的自增自减运算和组合运算 ip1+; ip2+=4; coutvv*ip1=vv(*ip1)vve ndl; coutvv*ip2=vv(*ip2)vvendl; 测试指针变量之间的关系运算 int n=ip2ip1; coutvvip2ip1=vvnvvendl; coutvvip2!=NULL=vv(ip2!=NULL)vvendl; /指针变量之间的减法 n=ip2-ip1; coutvvip2-ip1=vvnvvendl; #includeviostream.h # main() 声明字符型数组和指针变量 char str10; char *strip=str; /输入输出 cou

48、tstr;/用字符数组输入字符串 coutvvstr=vvstrvvendl; coutvvstrip=vvstripvvendl; coutstrip;/用字符指针变量输入字符串 coutvvstr=vvstrvvendl; coutvvstrip=vvstripvvendl; 利用指针变量改变其指向字符串的内容 *(strip+2)=T; coutvvstr=vvstrvvendl; coutvvstrip=vvstripvvendl; 动态为字符型指针变量分配内存 strip=new char(100); coutvvstrip=; cinstrip; /用字符指针变量输入字符串 cou

49、tvvstr=vvstrvvendl; coutvvstrip=vvstripvvendl; #includeviostream.h main() /声明用于存放运动员号码的数组 int h=1001,1002,1003,1004; /声明用于存放运动员成绩的数组 float x=12.3,13.1,11.9,12.1; /声明用于存放运动姓名的字符型指针数组 char *p=Wang hua,Zhang jian,Li wei,Hua ming; /i,j,it是用做循环控制变量和临时变量 int i,j,it; /ft用做暂存变量 float ft; /pt为字符型指针变量用做暂存指针变量

50、 char *pt; 用选择法对数组x进行排序，并相应调整数组h和p中的 数据 for (i=0;iv=3;i+) for (j=i+1;jv=3;j+) if (xi=xj) ft=xi,xi=xj,xj=ft; it=hi,hi=hj,hj=it; pt=pi,pi=pj,pj=pt; 以下打印排序结果 for (i=0;iv=3;i+) coutvvhivv ,vvpivv ,vvxivvendl; 声明指针数组 char *colors=Red,Blue,Yellow,Green; /指向指针的指针变量 char *pt; 通过指向指针的变量访问其指向的内容 pt=colors; fo

51、r (int i=0;iv=3;i+) coutvvpt=vvptvve ndl; coutvv*pt=vv*ptvve ndl; coutvv*pt=vv*ptvve ndl; pt+; #includeviostream.h main() /定义结构类型 struct books char title20; char author15; int pages; float price; ; 声明结构变量 struct books Zbk=VC+ ,Zhang,295,35.5; books Wbk; /对结构变量的输岀 coutvvZbk:vvendl; coutvvZbk.title vv

52、endl; coutvvZbk.authorvvendl; coutvvZbk.pagesvvendl; coutvvZbk.pricevvendl; coutvvvvendl; /对结构成员的运算 Zbk.pages+=10; Zbk.price+=0.5; coutvvZbk.pages=vvZbk.pagesvvendl; coutvvZbk.price=vvZbk.pricevvendl; coutvvvvendl; /对结构变量的输入输岀 coutvvWbk.title =; cinWbk.title; coutvvWbk.author=; cinWbk.author; coutvv

53、Wbk.pages=; cinWbk.pages; coutvvWbk.price=; cinWbk.price; coutvvWbk:vvendl; coutvvWbk.title vvendl; coutvvWbk.authorvvendl; coutvvWbk.pagesvvendl; coutvvWbk.pricevvendl; coutvvendl; 结构变量之间的相互赋值 books temp; temp=Wbk; coutvvtemp:vvendl; coutvvtemp.titlevvendl; coutvvtemp.authorvvendl; coutvvtemp.pages

54、vvendl; coutvvtemp.pricevvendl; #includeviostream.h main() int i; 定义结构类型 struct student int num; char name10; float maths; float physics; float chemistry; double total; ; /声明结构数组st student st3; /从键盘上为结构数组输入值 coutvv num name maths physics chemistry vvendl; for (i=0;iv3;i+) coutvvi+1vv ; cinsti.num; c

55、; cinsti.maths; cinsti.physics; cinsti.chemistry; 计算每个学生的总成绩 for (i=0;iv3;i+) sti.total=sti.maths+sti.physics+sti.chemistry; /输岀结构数组各元素的值 for (i=0;iv3;i+) coutvvstvvivv:; coutvvsti.numvvt; vvt; coutvvsti.mathsvvt; coutvvsti.physicsvvt; coutvvsti.chemistryvvt; coutvvsti.totalv

56、vendl; /定义结构类型 struct human char name10; int sex; int age; ; 声明结构变量和结构指针变量，并初始化 struct human x=WangPing,1,30,*p=NULL; /结构指针变量指向对象 p= 显示结构变量的值 =vvendl; coutvvx.sex=vvx.sexvvendl; coutvvx.age=vvx.agevvendl; /利用结构指针显示结构对象中的数据 coutvv(*p). name=vv(*p). namevve ndl; coutvv(*p).sex=vv(*

57、p).sexvve ndl; coutvv(*p).age=vv(*p).agevve ndl; coutvvp-n ame=vvp-n amevve ndl; coutvvp-sex=vvp-sexvve ndl; coutvvp-age=vvp-agevve ndl; 通过结构指针为结构对象输入数据 coutvvname:; cin (*p). name; coutvvsex:; cin (*p).sex; coutvvage:; cin (*p).age; 显示结构变量的值 =vvendl; coutvvx.sex=vvx.sexvvendl; c

58、outvvx.age=vvx.agevvendl; includeviostream.h main() /定义结构类型 struct human char name10; int sex; int age; ; 声明结构变量和结构指针，并初始化 struct human x=WangPing,1,30,*p= /利用结构指针显示结构中的数据 coutvv(*p). name=vv(*p). namevve ndl; coutvv(*p).sex=vv(*p).sexvve ndl; coutvv(*p).age=vv(*p).agevve ndl; coutvvvvendl; /利用new运算

59、符为p分配内存 #includeviostream.h main() 13 p=new human; 从键盘上为p指向的结构对象赋值 coutn ame=; cinp-name; coutvvp_sex=; cinp_sex; coutvvp_age=; cinp_age; coutvvvvendl; 显示p所指结构对象的值 coutn ame=n amee ndl; coutsex=vvp-sexvve ndl; coutvvp-age=vvp-agevve ndl; coutvvvvendl; 显示结构变量的值 =vvendl; coutvvx.se

60、x=vvx.sexvvendl; coutvvx.age=vvx.agevvendl; 释放p指向的内存 delete p; #includeviostream.h main() 定义结构类型 struct human char name10; int sex; int age; ; 声明结构数组和结构指针变量，并初始化 human x=WeiPing,1,30,LiHua,1,25,LiuMin,0,23,*p=NU LL; 用下标变量的输岀结构数组的元素 for (int i=0;iv3;i+) vvt; coutvvxi.sexvvt; coutvvxi.age