#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
cout<<"Welcome to the C ++ Standard Template Library!!!"<<endl;
getchar(); //等待输入任意键，之后程序退出；
return 0;
}执行结果:
Welcome to the C ++ Standard Template Library!!!
#include <iostream>
#include <cmath>
#include <stdio.h>
using namespace std;
int main()
{
float pi=3.1415916;
float radius=0;
float area=0.0;
float girth=0.0;
cout<<"circle->radius:"<<endl;
cin>>radius;
area=pi*pow(radius,2); //使用数学函数pow(),乘方
girth=2*pi*radius; //周长
cout<<"area="<<area<<";girth="<<girth<<endl;
getchar();
getchar(); //等待程序退出
return 0;
}执行结果:
circle->radius:
10
area=314.159;girth=62.8318
root@mingdi-desktop:/home/share# ./stl1
circle->radius:
80
area=20106.2;girth=502.655
#include <iostream>
#include <cmath>
#include <stdio.h>
using namespace std;
class Calculator
{
public:
Calculator();
~Calculator();
float x;
float y;
float Adder(float x,float y);
float Substration(float x,float y);
float Multiplication(float x,float y);
float Division(float x,float y);
float CPow(float x,float y);
float CSqrt(float x);
};
Calculator::Calculator()
{
x=0;
y=0;
}
Calculator::~Calculator()
{
}
float Calculator::Adder(float x,float y)
{
float He=0;
He=x+y;
return He;
}
float Calculator::Substration(float x,float y)
{
float Cha=0;
Cha=x-y;
return Cha;
}
float Calculator::Multiplication(float x,float y)
{
float Ji=0;
Ji=x*y;
return Ji;
}
float Calculator::Division(float x,float y)
{
float Shang=0;
if(y==0.0) //分母除数不能等于0
return -1;
Shang=x/y;
return Shang;
}
float Calculator::CPow(float x,float y) //x的Y次方
{
float ChengFang=0;
ChengFang=pow(x,y);
return ChengFang;
}
float Calculator::CSqrt(float x) //开平方
{
float sqrtC=0.0;
sqrtC=sqrt(x);
return sqrtC;
}
int main()
{
float x=0;
float y=0;
cout<<"Input x:";
cin>>x;
cout<<endl;
cout<<"Input y:";
cin>>y;
cout<<endl;
Calculator my;
float He=my.Adder (x,y);
cout<<"Adder:"<<He<<endl;
float Cha=my.Substration(x,y);
cout<<"Substration"<<Cha<<endl;
float Ji=my.Multiplication(x,y);
cout<<"Multiplication"<<Ji<<endl;
float Shang=my.Division(x,y);
cout<<"Division"<<Shang<<endl;
float Pow=my.CPow(x,y);
cout<<"CPow"<<Pow<<endl;
float KaiFang=my.CSqrt(x);
cout<<"CSqrt"<<KaiFang<<endl;
cout<<"Any key program exit";
getchar();
getchar();
}执行结果:
Input x:50
Input y:10
Adder:60
Substration40
Multiplication500
Division5
CPow9.76563e+16
CSqrt7.07107
Any key program exit
#include <iostream>
using namespace std;
void count(bool YN,int &counter)
{
if(YN)
{
counter++;
}
}
int main()
{
int counter=0;
bool YN=1;
while(YN)
{
count(YN,counter);
cout<<" "<<counter<<endl;
if(counter>5)
{
YN=0;
}
}
}执行结果:
1
2
3
4
5
6
#include <iostream>
#include <list>
#include <string.h>
using namespace std;
struct PERSON{
int id;
int sex;
double core;
void clear()
{
id=0;
sex=0;
core=0;
}
};
int main()
{
PERSON temp;
list<PERSON>C1;
int id_temp;
int sex_temp;
double core_temp;
int size=0;
C1.clear();
int counter=0;
cout<<"This is a simplest C++ Example!\n"<<endl;
cout<<"Start with any key ...";
cin.get();//按回车键等待
while (counter<5)
{
cout<<"input ID:";
cin>>id_temp;
cout<<"input sex:";
cin>>sex_temp;
cout<<"input core:";
cin>>core_temp;
temp.id=id_temp;
temp.sex=sex_temp;
temp.core=core_temp;
C1.push_back(temp); //尾部加入一个数据
memset(&temp,0,sizeof(PERSON));
counter++;
}
cout<<"Enter to continue ...";
cin.get();
size=C1.size();
cout<<endl;
list<PERSON>::iterator Iter;
for(Iter=C1.begin();Iter!=C1.end();Iter++)
{
temp.clear();
temp=*Iter;
cout<<"ID:"<<temp.id<<",SEX:"<<temp.sex<<",Core:"<<temp.core<<endl;
}
cout<<"Any key to exit the program ...";
cin.get();
return 0;
}执行结果:
This is a simplest C++ Example!
Start with any key ...
input ID:001
input sex:0
input core:90
input ID:002
input sex:1
input core:80
input ID:003
input sex:0
input core:95
input ID:004
input sex:0
input core:95
input ID:005
input sex:1
input core:93
Enter to continue ...
ID:1,SEX:0,Core:90
ID:2,SEX:1,Core:80
ID:3,SEX:0,Core:95
ID:4,SEX:0,Core:95
ID:5,SEX:1,Core:93
Any key to exit the program ...
#include <iostream>
using namespace std;
int main()
{
long Aa=11;
long *B_Pointer=NULL;
B_Pointer=&Aa;
cout<<"Aa:"<<Aa<<" ,Aa Memory address: "<<B_Pointer<<endl;
cin.get();
}执行结果:
Aa:11 ,Aa Memory address: 0x7fffa190f1d8
#include <iostream>
#include <cmath>
using namespace std;
double pow2(float x);//声明
double pow3(float* y);//声明
double pow2(float x) //定义
{
double z=0;
z=x*x;
return z;
}
double pow3(float *y) //定义
{
double z=0;
z=(*y)*(*y)*(*y);
return z;
}
int main()
{
double A=10;
float B=20;
double C=0;
double D=0;
C=pow2(A);
//D=pow3(A);
cout<<"A: "<<A<<" ; Pow2(A): "<<C<<endl;
D=pow3(&B);
//D=pow3(&A);
cout<<"B: "<<B<<" ; Pow3(B): "<<D<<endl;
cin.get();
}执行结果:
A: 10 ; Pow2(A): 100
B: 20 ; Pow3(B): 8000
#include <iostream>
using namespace std;
int Factor(int n)
{
int answer=0;
if(n==1)
{
return (1);
}
answer=Factor(n-1)*n;
return answer;
}
int main()
{
int n=5;
int result=0;
result=Factor(n);
cout<<"5!= 5x4x3x2x1 = "<<result<<" "<<endl;
cin.get();
}
执行结果:
5!= 5x4x3x2x1 = 120
#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
int x;
for(x=1;x<11;++x)
printf("%d ",x*x);
printf("\n");
cin.get();
}执行结果:
1 4 9 16 25 36 49 64 81 100
#include<iostream>
#include <fstream>
using namespace std;
int main(int argc,char *argv[])
{
ifstream f1;
ofstream f2;
char filename1[256];
char filename2[256];
char content[256];
cout<<"Please enter a file name (source):";
cin>>filename1;
cout<<"Please enter a file name (purpose):";
cin>>filename2;
f1.open(filename1,ios::in);
f2.open(filename2,ios::out);
while (!f1.eof()) //文字流"(stream)的结尾
{
f1.getline(content,128);
f2<<content<<endl;
}
f1.close();
f2.close();
}#include <iostream>
#include <list>
#include <ctime>
using namespace std;
void mysleep(int second)
{
clock_t st;
st=clock();
while (clock()-st<second*CLOCKS_PER_SEC);//CLOCKS_PER_SEC表示一秒钟内CPU运行的时钟周期数（时钟计时单元）
}
int main()
{
int count=5;
float number=0.0;
list<int> mylist;
cout<<"input 5 number:"<<endl;
while (count--)
{
cin>>number;
mylist.push_back(number);
}
list<int>::iterator iter;
for(iter=mylist.begin();iter!=mylist.end();iter++)
{
cout<<*iter<<" , ";
}
cout<<endl;
return 0;
}执行结果:
input 5 number:
5
6
4
7
8
5 , 6 , 4 , 7 , 8 ,
