C++ string to int && int to string [自己开发的博客网站，欢迎访问](www.weiboke.online) www.weiboke.online

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string to int

1. int stoi (const string& str, size_t* idx = 0, int base = 10);
2. int atoi (const char * str); (要调用std::string::c_str() 将string to const char* 才能使用函数，效率自然比上一个慢很多)

#int to string

1. string to_string (int val);
2. string to_string (long val);
3. string to_string (long long val);
4. string to_string (unsigned val);
5. string to_string (unsigned long val);
6. string to_string (unsigned long long val);
7. string to_string (float val);
8. string to_string (double val);
9. string to_string (long double val);