分割字符串:https://www.cnblogs.com/zealousness/p/9971709.html

字符串比较:https://www.cnblogs.com/zealousness/p/10140189.html

求绝对值:

#include<cmath>
std::cout<<abs(-)<<std::endl;

开平方:

#include<cmath>
std::cout<<sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))<<std::endl;

异常处理:

try{
...
}catch(std::exception e){
...
}

【c++】【常用函数】-LMLPHP

double 转字符串

// The C way:
char buffer[];
snprintf(buffer, sizeof(buffer), "%g", myDoubleVar); // The C++03 way:
std::ostringstream sstream;
sstream << myDoubleVar;
std::string varAsString = sstream.str(); // The C++11 way:
std::string varAsString = std::to_string(myDoubleVar); // The boost way:
std::string varAsString = boost::lexical_cast<std::string>(myDoubleVar);
05-18 02:18
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