当前位置：首页 > news >正文

C++学习day4

news 2025/4/3 11:18:34

思维导图：

练习：

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sstream>
#include <vector>
#include <memory>using namespace std;class mydouble{
private:int a;int b;
public:mydouble(int a,int b):a(a),b(b){};void show(){cout << a << "." << abs(b) << endl;}mydouble operator+(const mydouble& r){mydouble AB(0,0);AB.a= a + r.a;AB.b= b + r.b;                                       return AB;}mydouble operator-(const mydouble& r){mydouble AB2(0,0);AB2.a = a - r.a;AB2.b = b - r.b;return AB2;}mydouble operator*(const mydouble& r){mydouble AB3(0,0);AB3.a = a * r.a;AB3.b = b * r.b;return AB3;}};int main(int argc,const char** argv){mydouble A(3,14);A.show();mydouble B(1,23);B.show();mydouble AB=A+B;printf("A+B的值为：");AB.show();mydouble AB2 = A-B;printf("A-B的值为：");AB2.show();mydouble AB3 = A*B;printf("A*B的值为：");AB3.show();}

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sstream>
#include <vector>
#include <memory>using namespace std;class myOut{
private:public:void operator<<(int a){printf("%d\n",a);cout<<a<<endl;}void operator<<(double a ){printf("%f\n",a);cout<<a<<endl;}void operator<<(const char* a){printf("%s\n",a);cout<<a<<endl;                                          }void operator<<(ostream&(*endl)(ostream&)){printf("\n");}
};
/*ostream& operator<<(ostream& out,const myOut& r)
{out<<r;
*/
int main(int argc,const char** argv){myOut out;out<<1;out<<3.14;out<<"hello";out<<endl;return 0;
}