为C初学者准备的一些简单例子.doc

/you must konw the differences between BASIC and C+/in c+ ,= do not mean equal!while = has the meaning !#include stdafx.h#include using namespace std;int n;bool flag=true;int main(int argc, char* argv)coutn;for(int i=2;i!=n;+i)if(n%i=0)cout这是一个非质数iendl;flag=false;break;if(flag=true) cout你输入了一个质数endl;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 stdafx.h#includeusing namespace std;void func(int a,int b,int c=4,int d=5)coutatbtctdendl;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 stdafx.h#includeusing namespace std;int f(double n)int n1=n;if(n-n10&0.5n-n1) return n1;if(n-n1=0.5) return n1+1;int main(int argc, char* argv) double x;cinx;coutxtf(x)endl;return 0;*#include stdafx.h# include#includeusing namespace std;int re;int main(int argc, char* argv) srand(unsigned)time(NULL); int ran1,ran2; ran1=rand()%100+1; ran2=rand()%100+1; coutran1+ran2re; if(re=ran1+ran2) cout真棒，答对了endl; else cout再算一次吧 ran1+ran2re; if(re=ran1+ran2)cout真棒，答对了endl; else cout 真遗憾，答错了endl; 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 stdafx.h#includeusing namespace std;int main(int argc, char* argv) int a10=77,83,72,54,92,65,75,81,43,96;int b5=60,70,80,90,100;int c5=0;for(int i=0;i=bj)j+;cj+;for(i=0;i5;i+)coutci;coutendl;return 0;/ 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 stdafx.h#includeusing namespace std;class rectfloat x,y;public:rect(float a=1, float b=1)x=a,y=b; coutnow lets do the constructor=,=endl; void set(float a=0,float b=0)x=a,y=b;rect(rect & obj4)x=obj4.x; y=obj4.y;coutexecute copy constructorendl;/ 1float peri();float area();rect()coutexecute the destructorendl;/2;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);coutThe first time calculation results: endl;coutThe perimeter of rectangle No1: obj.peri(), area: obj.area()endl;coutthe perimeter of rectangle No2: obj2.area(), area: obj2.area()endl; coutthe perimeter of rectangle No3: obj3.peri(), area: obj3.area()endl;obj.set(12,34);obj2.set(34,78);coutnow ,lets do the second time calculation: endl;coutthe perimeter of rectangle No1: obj.peri(), area: obj.area()endl;coutthe perimeter of rectangle No2: obj2.area(), area: obj2.area()endl;*8/ 对象与类的测试.cpp : Defines the entry point for the console application./#include stdafx.h#includeusing namespace std;class rectfloat 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;coutThe first time calculation results: endl;coutThe perimeter of rectangle No1: obj.peri(), area: obj.area()endl;coutthe perimeter of rectangle No2: obj2.area(), area: obj2.area()endl;obj.set(12,34);obj2.set(34,78);coutnow ,lets do the second time calculation: endl;coutthe perimeter of rectangle No1: obj.peri(), area: obj.area()endl;coutthe perimeter of rectangle No2: obj2.area(), area: obj2.area()endl;#include stdafx.h#include#includeusing namespace std;int white,black,sum,ran1,ran2;int main(int argc, char* argv)srand(unsigned)time(NULL);coutwhite;coutblack;sum=black+white;while(black+white!=1) ran1=rand()%sum+1; ran2=rand()%sum+1;if(ran1,ran2white ) white-;sum-; if(ran1white) black-;sum-; if(ran2white) black-;sum-;if(white=1)cout最后一个球的颜色是：白色endl;else cout最后一个球的颜色是：黑色endl;return 0;#include stdafx.h#includeusing namespace std;const max=100;class arrayprivate:int shuzumax;int last;public: array(); void isfull(); void isempty(); void delete_date(); int insert();array:array(int,int)for(size_t i=0; i!=99;+i)shuzui=0; array:isempty()if(shuzu.0=0) coutisempty() tell that the arr