第一章复习

// 通过这个小程序复习了一下 命名空间 、 const 、函数重载 、类的定义、类的两种实例化方式； // 初步理解了C++ 特性的前提，把函数和类武装到牙齿，从 C面向过程 转变成 一门面向对象的语言； #include<cstdio> #include<cstring> #include<iostream> #include<algorithm> using namespace std; const int MAXN = 5; namespace AA { int x = 20; int y = 30; } class Aassd { public: int x; void outx(){ cout << x << endl; } }; class Bassd { public: int x; int y; int arr[5]; void outx(){ cout << x << endl; } void outy(){ cout << y << endl; } void outarr(){ for( int i=0; i<MAXN; i++ ){ cout << arr[i] << endl; } } }; int gax( float a,int b ); int gax( int a,int b,int c); int gax( int a,int c ); int gax( float a,float b,double c,double d); int main() { Aassd coor; coor.x = 10 ; coor.outx(); Bassd *coortwo = new Bassd(); if( coortwo == NULL ){ return 0; } coortwo->x = AA::x; coortwo->y = AA::y; coortwo->outx(); coortwo->outy(); for( int i=0; i<MAXN; i++ ) { coortwo->arr[i] = i; } coortwo->outarr(); delete coortwo; coortwo = NULL; gax(AA::x,AA::y); printf("\n"); gax((float)AA::x,AA::y); printf("\n"); float mid = AA::x*1.23; gax(mid,AA::x,AA::y,AA::y); return 0; } int gax( float a,int b ) { cout << "1 //" << a << " " << b << endl; } int gax( int a,int b,int c){ cout << "2 //" << a << " " << b << " " << c << endl; } int gax( int a,int c ){ cout << "3 //" << a << " " << c << endl; } int gax( float a,float b,double c,double d){ cout << "4 //" << a << " " << b <<" " << c << " " << d << endl; }