为C++初学者准备的一些简单例子

//you must konw the differences between BASIC and C++ //in c++ ,= do not mean equal!while == has the meaning ! #include \#include using namespace std; int n;

bool flag=true;

int main(int argc, char* argv[]) { cout<<\请输入一个整数: \ cin>>n; for(int i=2;i!=n;++i){ if(n%i==0){cout<<\这是一个非质数\ } if(flag==true) cout<<\你输入了一个质数\ return 0; }

88***************************************************************************** /*这个习题考察的是对初始值的理解；在定义func这个函数的时候 对C,D规定 了初始值，但是如果在调用的时候对于CD有了重新的定义，。那么输出的值 就不熟3和4了；这里的理解有误*/ #include \#include using namespace std;

void func(int a,int b,int c=4,int d=5) { cout<

int main(int argc, char* argv[]) { func(10,25,35,40); func(10,11,12); func(113,13); return 0; }

//简单的四舍五入程序，自己的想法，很不错~ #include \#include using namespace std; int f(double n){ int n1=n; if(n-n1>0&&0.5>n-n1) return n1;

if(n-n1>=0.5) return n1+1; }

int main(int argc, char* argv[]) { double x; cin>>x; cout<

********************************************************************** #include \# include #include using namespace std; int re;

int main(int argc, char* argv[]) {

srand((unsigned)time(NULL)); int ran1,ran2;

ran1=rand()0+1; ran2=rand()0+1;

cout<>re;

if(re==ran1+ran2) cout<<\真棒，答对了\

else{ cout<<\再算一次吧~ \ cin>>re;

if(re==ran1+ran2)cout<<\真棒，答对了\ else cout<<\真遗憾，答错了\ } return 0; }

// 习题3点11.cpp : Defines the entry point for the console application. // 判断这个函数的的结果

// when you do such kind of exercise ,pay attention to the progress //make sure that you konw the progress well,if not ,calm down~

#include \#include using namespace std;

int main(int argc, char* argv[]) {

}

int a[10]={77,83,72,54,92,65,75,81,43,96}; int b[5]={60,70,80,90,100}; int c[5]={0};

for(int i=0;i<10;i++) { int j=0; while(a[i]>=b[j])j++; c[j]++; } for(i=0;i<5;i++)cout<

// 测试复制构造函数.cpp : Defines the entry point for the console application. //

// 对象与类的测试.cpp : Defines the entry point for the console application.

//this code is an example of the destructor and the copy consturctor;pay attention to the result and understand the execute progress;

// take notice of of mark 1 and mark2;mark1 is about the definition of the destructor;

#include \#include using namespace std; class rect{ float x,y; public: rect(float a=1, float b=1){x=a,y=b; cout<<\ void set(float a=0,float b=0){x=a,y=b;} rect(rect & obj4){x=obj4.x; y=obj4.y;cout<<\ float peri(); float area(); ~rect(){cout<<\ };

float rect::peri() { float z; z=2*x+2*y; return z;

}

float rect::area() { float z; z=x*y; return z; }

void main() { rect obj(78.5,52),obj2,obj3(obj); cout<<\ cout<<\ cout<<\ cout<<\ obj.set(12,34); obj2.set(34,78); cout<<\ cout<<\ cout<<\}

***************************************************************************8 // 对象与类的测试.cpp : Defines the entry point for the console application. //

#include \#include using namespace std; class rect{ float x,y; public: rect(float a=1, float b=1){x=a,y=b;} void set(float a=0,float b=0){x=a,y=b;} float peri(); float area(); };

float rect::peri() { float z; z=2*x+2*y; return z; }

float rect::area() { float z;

z=x*y; return z; }

void main() { rect obj(78.5,52),obj2; cout<<\ cout<<\ cout<<\ obj.set(12,34); obj2.set(34,78); cout<<\ cout<<\ cout<<\}

#include \#include #include using namespace std;

int white,black,sum,ran1,ran2;

int main(int argc, char* argv[]) { srand((unsigned)time(NULL)); cout<<\请输入白球的个数：\ cin>>white; cout<<\请输入黑球的个数: \ cin>>black; sum=black+white; while(black+white!=1){ ran1=rand()%sum+1; ran2=rand()%sum+1; if(ran1,ran2<=white ){ white--; sum--; } if(ran1,ran2>white ){ white--; sum--; }

if(ran1white){ black--; sum--; }

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