C++程序设计编程实例大全.doc

C++程序编程实例大全
#include<iostream>
int main()
{
std::cout<<"hello world!";
}
#include "iostream"
using namespace std;
void main()
{
int *p;
p=new int;
*p=5;
/*p=new int(5);*/
cout<<*p;
delete p;
}
#include "iostream"
using namespace std;
void main()
{ char name[10];
cout<<"please input your name:";
cin>>name;
cout<<"the name is "<<name<<endl;
}
#include "iostream"
using namespace std;
void main()
{ char name[10];
int age;
cout<<"please input your name:";
cin>>name;
cout<<"how old are you:";
cin>>age;
cout<<"the name is "<<name<<endl;
cout<<"the age is "<<age<<endl;
}

#include "iostream"
using namespace std;
void main()
{
struct student
{
int no;
float math;
};
int n;
cin>>n;
student wang;
wang.no=n;
cin>>wang.math;
cout<<wang.no<<" "<<wang.math<<endl;
}
#include "iostream"
using namespace std;
void main()
{
int *p;
int n;
cout<<"please input the length of the array: ";
cin>>n;
if((p=new int[n])==0)
{
cout<<"can't allocate more memory, terminating"<<endl;
exit(1);
}
for(int i=0;i<n;i++)
p[i]=i*2;
cout<<"Now output the array: "<<endl;
for(i=0;i<n;i++)
cout<<p[i]<<" "<<endl;
delete []p;
}

#include "iostream"
using namespace std;
void main()
{
int *p;
int n;
cout<<"please input the length of the array: ";
cin>>n;
if((p=new int[n])==0)
{
cout<<"can't allocate more memory, terminating"<<endl;
exit(1);
}
for(int i=0;i<n;i++)
p[i]=i*i+1;
cout<<"Now output the array: "<<endl;
for(i=0;i<n;i++)
cout<<p[i]<<" ";
cout<<endl;
delete []p;
}
/* Note:Your choice is C IDE */
#include <iostream>
using namespace std;
float a=2.4;
void main()
{
int a=8;
cout<<a<<endl;
cout<<::a<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
void main()
{
int num=50;
int &ref=num;
ref+=10;
cout<<"num="<<num<<endl;
cout<<"ref="<<ref<<endl;
num+=40;
cout<<"num="<<num<<endl;
cout<<"ref"<<ref<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
void main()
{
int num;
int &ref=num;
num=5;
cout<<"num="<<num<<endl;
cout<<"ref="<<ref<<endl;
cout<<"&num="<<&num<<endl;
cout<<"&ref="<<&ref<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream>
using namespace std;
void swap(int &x,int &y);
void main()
{
int x=5,y=6;
cout<<"before swap, x:"<<x<<" ,y:"<<y<<endl;
swap(x,y);
cout<<"after swap, x:"<<x<<" ,y:"<<y;
}
void swap(int &rx,int &ry)
{
int t=rx;
rx=ry;
ry=t;
}
#include<iostream>
//using namespace std;
void main()
/*{
double radius;
cout<<"please input radius:";
cin>>radius;
double result=radius*radius*3.14*4;
cout<<"The result is "<<(double)result<<"\n";
}
*/
{
double radius;
std::cout<<"please input radius: ";
std::cin>>radius;
std::cout<<"The result is "<<radius*radius*3.14*4<<"\n";
}
/* Note:Your choice is C IDE */
#include <iostream>
using namespace std;
int array[6][4]={{60,80,90,75},{75,85,65,77},{80,88,90,98},{89,100,78,81},{62,68,69,75},{85,85,77,91}};
int &level(int grade[],int size,int &tA,int &tB );
void main()
{
int typeA=0,typeB=0;
int student=6;
int gradesize=4;
for(int i=0;i<student;i++)
level(array[i],gradesize,typeA,typeB)++;
cout<<"number of type A is "<<typeA<<endl;
cout<<"number of type B is "<<typeB<<endl;
}
int &level(int grade[],int size,int &tA,int &tB)
{
int sum=0;
for(int i=0;i<size;i++)
sum+=grade[i];
sum/=size;
if(sum>=80)
return tA;
else
return tB;
}
/* Note:Your choice is C IDE */
#include <iostream>
using namespace std;
float &fn2(float r)
{
float t;
t=3.14*r*r;
return t;
}
void main()
{
fn2(5.0)=12.4;
cout<<fn2(5.0)<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream>
#include <string>
using namespace std;
void main()
{
string s,t;
cout<<"please input a zifuchuan:"<<endl;
cin>>s;
t="I like programming!";
cout<<"zifuchuan output:"<<endl<<s<<endl<<t<<endl;
cout<<s.append(" OK!")<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream>
using namespace std;
inline double circumference(double radius);
void main()
{
double r=3.0,s;
s=circumference(r);
cout<<"the circumference is "<<s<<"."<<endl;
}
inline double circumference(double radius)
{
return 2*3.1415926*radius;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
int add(int x,int y)
{
int sum;
sum=x+y;
return sum;
}
int add(int x,int y,int z)
{
int sum;
sum=x+y+z;
return sum;
}
void main()
{
int a,b;
a=add(5,10);
b=add(5,10,20);
cout<<"a="<<a<<endl;
cout<<"b="<<b<<endl;

}
/* Note:Your choice is C IDE */
#include <iostream.h>
template<class T>
T min(T a[],int n)
{
int i;
T minv=a[0];
for(i=1;i<n;i++)
if(minv>a[i])
minv=a[i];
return minv;
}
void main()
{
int a[]={1,3,0,2,7,6,4,5,2};
double b[]={1.2,-3.4,6.8,9.8};
int c[]={1,9,5,-6,7,8};
cout<<"a de shuzu zhong min zhi wei:"<<min(a,9)<<endl;
cout<<"b de shuzu zhong min zhi wei:"<<min(b,4)<<endl;
cout<<"c de shuzu zhong min zhi wei:"<<min(c,6)<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
#define PI 3.1415926535
#define CS Circle_Square
template<class T>
double Circle_Square(T x)
{
return x*x*PI;
}
double Circle_Square(long x)
{
return x*x*PI;
}
void main()
{
int r1=1;
double r2=2.0;
long r3=3;
cout<<"The first cs is "<<CS(r1)<<endl;
cout<<"The second cs is "<<CS(r2)<<endl;
cout<<"The third cs is "<<CS(r3)<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
void main()
{
int i=0,&l=i,&k=l;
i=++l-k;
cout<<"i="<<i<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
class Tdate
{
public:
void set(int,int,int);
int isLeapYear();
void print();
private:
int month;
int day;
int year;
};
void Tdate::set(int m,int d,int y)
{
month=m;day=d;year=y;
}
int Tdate::isLeapYear()
{
return((year%4==0&&year%100!=0)||(year%400==0));
}
void Tdate::print()
{
cout<<month<<"/"<<day<<"/"<<year<<endl;
cout<<isLeapYear()<<endl;
}
void main()
{
Tdate x;
x.set(10,23,2000);
x.isLeapYear();
x.print();
}
/* Note:Your choice is C IDE */
#include <iostream.h>
class Tdate
{
public:
void set(int,int,int);
int isLeapYear();
void print();
private:
int month;
int day;
int year;
};
void Tdate::set(int m,int d,int y)
{
month=m;day=d;year=y;
}
int Tdate::isLeapYear()
{
return((year%4==0&&year%100!=0)||(year%400==0));
}
void Tdate::print()
{
cout<<year<<"/"<<month<<"/"<<day<<endl;
}
void someFunc(Tdate& refs)
{
refs.print();
if(refs.isLeapYear())
cout<<"error"<<endl;
else
cout<<"right"<<endl;
}
void main()
{
Tdate s,*pTdate=&s;
s.set(2,15,1998);
pTdate->print();
if((*pTdate).isLeapYear())
cout<<"error"<<endl;
else
cout<<"right"<<endl;
someFunc(s);
}
#include<iostream>
using namespace std;
void sphere();
int main()
{
sphere();
}
void sphere()
{
double radius;
cout<<"please input radius:";
cin>>radius;
if(radius<0) return;
cout<<"the result is "<<radius*radius*3.14*4<<"\n";
}
/* Note:Your choice is C IDE */
#include<iostream.h>
const int SIZE=10;
class Cstack
{
private:
char stk[SIZE];
int position;
public:
void init()
{
position=0;
}
char push(char ch);
char pop();
};
char Cstack::push(char ch)
{
if(position==SIZE)
{
cout<<"栈满"<<endl;
return 0;
}
stk[position++]=ch;
return ch;
}
char Cstack::pop()
{
if(position==0)
{

cout<<"\n栈空"<<endl;
return 0;
}
return stk[--position];
}
void main()
{
Cstack s;
s.init();
char ch;
cout<<"please input some characters:"<<endl;
cin>>ch;
while(ch!='#'&&s.push(ch))
cin>>ch;
cout<<endl;
cout<<"now output the data:"<<endl;
while(ch=s.pop())
cout<<ch;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
class Tdate
{
public:
void set(int m=5,int d=16,int y=1991)
{
month=m;day=d;year=y;
}
void print()
{
cout<<month<<"/"<<day<<"/"<<year<<endl;
}
private:
int month;
int day;
int year;
};
void main()
{
Tdate a,b,c;
a.set(4,12,1996);
b.set(3);
c.set(8,10);
a.print();
b.print();
c.print();
}
/* Note:Your choice is C IDE */
#include<iostream.h>
class cube
{
public:
int volume(int ht,int wd)
{
return ht*wd;
}
int volume(int ht,int wd,int dp)
{
return ht*wd*dp;
}
private:
int ht,wd,dp;
};
void main()
{
cube c;
cout<<c.volume(10,20)<<endl;
cout<<c.volume(10,20,30)<<endl;
}
/* Note:Your choice is C IDE */
#include <iostream.h>
class queue
{/*默认私有*/
int q[100];
int sloc,rloc;
public:
queue();
void qput(int i);
int qget();
};
queue::queue()
{
sloc=rloc=0;
cout<<"queue initialized"<<endl;
}
void queue::qput(int i)
{
if(sloc==100)
{
cout<<"queue is full"<<endl;
return;
}
sloc++;
q[sloc]=i;
}
int queue::qget()
{
if(rloc==sloc)
{
cout<<"queue is empty"<<endl;
return 0;
}
rloc++;
return q[rloc];
}
void main()
{
queue a,b;
a.qput(10);
b.qput(20);
a.qput(20);
b.qput(19);
cout<<a.qget()<<" ";
cout<<b.qget()<<"\n";
cout<<a.qget()<<" ";
cout<<b.qget()<<"\n";
}
/* Note:Your choice is C IDE */
#include <iostream.h>
class test
{
private:
int num;
float f1;
public:
test();
test(int n,float f);
int getint()
{
return num;
}
float getfloat()
{
return f1;
}
};
test::test()
{
cout<<"Initializing default"<<endl;
num=0;
f1=0.0;
}
test::test(int n,float f)
{
cout<<"Initializing"<<n<<","<<f<<endl;
num=n;
f1=f;
}
void main()
{
test x;
test y(10,21.5);
test *px=new test;
test *py=new test(10,21.5);
}
/* Note:Your choice is C IDE */
#include <iostream.h>
class Tdate
{
public:
Tdate(int m=5,int d=16,int y=1990)
{
month=m;day=d;year=y;
cout<<month<<"/"<<day<<"/"<<year<<endl;
}
private:
int month;
int day;
int year;
};
void main()
{
Tdate aday;
Tdate bday(2);
Tdate cday(3,12);
Tdate dday(1,22,1998);
}
/* Note:Your choice is C IDE */
#include <iostream>
#include <string>
using namespace std;
class Student
{
public:
Student(char *pName)
{
cout<<"call one parameter constructor"<<endl;
strncpy(name,pName,sizeof(name));
name[sizeof(name)-1]='\0';
cout<<"the name is "<<name<<endl;
}
Student()
{
cout<<"call no parameter constructor"<<endl;
}
protected:
char name[20];
};
void main()
{
Student noName;
Student ss("Jenny");
}
/* Note:Your choice is C IDE */
#include<iostream>
using namespace std;
class test
{
private:
int num;
float f1;
public:
test();
test(int n,float f);
int getint()
{
return num;
}
float getfloat()
{
return f1;
}
};
test::test()
{
cout<<"Initializing default"<<endl;
num=0;
f1=0.0;
}
test::test(int n,float f)
{
cout<<"Initializing"<<n<<","<<f<<endl;
num=n;
f1=f;
}
void main()
{
cout<<"the main function:"<<endl;
test array[5];
cout<<"the second element of array is "<<array[1].getint()<<","<<array[1].getfloat()<<endl;
}
/* Note:Your choice is C IDE */
#include<iostream>
using namespace std;
class test
{
private:
int num;
float f1;
public:
test(int n);
test(int n,float f);
};
inline test::test(int n)
{
cout<<"Initializing\t"<<n<<endl;
num=n;
}
test::test(int n,float f)
{
cout<<"Initializing\t"<<n<<","<<f<<endl;
num=n;
f1=f;
}
void main()
{
test array1[3]={1,2,3};
test array2[]={test(2,3.5),test(4)};
test array3[]={test(5.5,6.5),test(7,8.5)};
test array4[]={test(5.5,6.5),7.5,8.5};
}
/* Note:Your choice is C IDE */
#include<iostream>
using namespace std;
class test
{
private:
int num;
float f1;
public:
test(int n);
test(int n,float f);
};
inline test::test(int n)
{
cout<<"Initializing\t"<<n<<endl;
num=n;
}
test::test(int n,float f)
{
cout<<"Initializing\t"<<n<<","<<f<<endl;
num=n;
f1=f;
}
void main()
{
test array1[3]={1,2,3};
test array2[]={test(2,3.5),test(4)};
test array3[]={test(5.5,6.5),test(7,8.5)};
test array4[]={test(5.5,6.5),7.5,8.5};
}
#include<iostream>
using namespace std;
int main()
{
for(int i=1;i<=10;i++)
{
for(int j=1;j<=i;++j)
cout<<"M";
cout<<endl;
}
}

#include<iostream.h>
class Tdate{
public:
Tdate(int m=5,int d=16,int y=1990)
{
month=m;day=d;year=y;
cout<<month<<"/"<<day<<"/"<<year<<endl;
}
private:
int month;
int day;
int year;
};
void main()
{
Tdate aday;
Tdate bday(2);
Tdate cday(3,12);
Tdate dday(1,21,1998);
}
#include<exception>
#include<iostream>
using namespace std;
void main()
{
try
{
exception theError;
throw(theError);
}
catch(const exception &theError)
{
cout<<theError.what()<<endl;
}
try
{
logic_error theLogicError("Logic Error!");
throw(theLogicError);
}
catch(const exception & theLogicError)
{
cout<<theLogicError.what()<<endl;
}
}
#include<iostream>
#include<string>
using namespace std;
class Person
{
public:
Person(char *na)
{
cout<<"call constructor"<<endl;
name=new char[strlen(na)+1];
if(name!=0)
{strcpy(name,na);}
}
Person(Person&p)
{
cout<<"call copy constructor"<<endl;
name=new char[strlen(p.name)+1];
if(name!=0)
{strcpy(name,p.name);}
}
void printname()
{
cout<<name<<endl;
}
~Person(){delete name;}
private:
char *name;
};
void main()
{
Person wang("wang");
Person li(wang);
wang.printname();
li.printname();
}
#include<iostream>
using namespace std;
class SillyClass
{
public:
SillyClass(int&i):te