c++_string与double/int互转

1. 字符串string转数值double/int等 使用 stringstream

stringstream ss;
string timeStr = s0.substr(0, 16);
ss > t;

使用atof atoi

string myStr = "123.332";
double myNum = atof(myStr.c_str());

string myStr = "123";
int myNum = atoi(myStr.c_str());