c++ note some detail

最新推荐文章于 2024-11-12 21:48:50 发布

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本文探讨了C++中使用cin进行数据读取的方法，包括如何处理负数及小数点后的数字，并介绍了类型转换和运算符重载的概念。

cin>> will check digit or other string automatically but cin.get don't check it

#include<iostream>

using namespace std;

int main()
{
char one_char,decimal_point,digit1,digit2;
long dollars;
bool negative;
cin>>one_char;
if(one_char == '-')
{
     negative = true;
     cin >> one_char;
}
else
{
     negative=false;
}

cin>>dollars>>decimal_point>>digit1>>digit2;

cout<< dollars <<" "<<decimal_point <<" "<<digit1<< "   " <<digit2<<endl;
}

static_cast<int>(v_char)-static_cast<int>('0');                       --return cast char to int

operator + or - or other applay a class instance+20 must be let os known how the 20 add the instance
first check operator fail then call instructor implicitly

ostream & operator<<(ostream & outs ,const class& cs)

big three copy constructor 、operator equal and destructor

unnamed namespace {}   is local to compilation unit.   global namespace