实验二#includeusing namespace std;const float pi=3.1416;int main(){ int iType; float radius,a,b,area;cout<<"图形的类型为？（1-圆形 2-长方形 3-正方形）："; cin>>iType;switch(iType){case 1:cout<<"圆的半径为：";cin>>radius;area=pi*radius*radius;cout<<"面积为："<>a;cout<<"矩形宽为：";cin>>b;area=a*b;cout<<"面积为："<>a;area=a*a; cout<<"面积为："<using std::cout;using std::cin;using std::endl;typedef struct { unsigned year; unsigned month; unsigned day; unsigned hour; unsigned min; unsigned sec;} tm;int main(void){ tm t; cout<<"Year:"<>t.year; cout<<"Month:"<>t.month ; cout<<"Day:"<>t.day; cout<<"Hour:"<>t.hour ; cout<<"Min:"<>t.min; cout<<"Sec:"<>t.sec; cout<using namespace std;double wendu(int f){ return(f-32)*5/9; }int main(){ int x;cout<<"请输入华氏温度:";cin>>x;cout<<"摄氏温度为:"<#include //因为用到了sqrt()函数，sqrt()为开根号 using namespace std;int main(){ cout<<"1计算圆面积"<>x; double area; while(x!=4) //当x!=4时循环，即当x=4时退出循环 { if(x==1) { double r; cout<<"半径:"; cin>>r; area=3.14*r*r; cout<<"面积为 "<>a>>b; area=a*b; cout<<"面积为 "<>a>>b>>c; d=0.5*(a+b+c); area=sqrt(d*(d-a)*(d-b)*(d-c)); cout<<"面积为 "<>x; } return 0;} }#includeusing namespace std;int Max1(int a,int b){ return a>b?a:b;}int Max1(int a ,int b ,int c){ return(a>b?a:(b>c?b:c));}double Max1(double a,double b){ return(a>b?a:b);}double Max1(double a,double b,double c){ return(a>b?a:(b>c?b:c));}int main(){ int x,y,z; double u,v,w; cout<<"请输入三个整数 并 求出它们的最大值:"; cin>>x>>y>>z ; cout<<"最大值是："<>x>>y; cout<>u>>v>>w; cout<<"最大值的双精度是："<>u>>v; cout<<"最大值是："<long fib(int n){int a;if(n==1)a=1;else if(n==2)a=1;else a=fib(n-1)+fib(n-2); return a;}void main(){ int h; printf("qingshuru h:"); scanf("%d",&h); fib(h); printf("%d",fib(h));}实验四#include #include using namespace std; class Date //日期类 { private: int year; int month; int day; public: Date(){} //默认构造 Date(int y,int m,int d) //带参构造 { year=y; month=m; day=d; } void set() //设置数据函数 { cin>>year>>month>>day; } void display() //显示函数 { cout<>num; cout<<"性别(m/f)："; cin>>sex; cout<<"生日："; birthday.set(); cout<<"身份证号："; cin>>ID; ID[18]='\0'; cout<
