Convert string to int C++

 

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  • How to parse a string to an int in C++? 17 answers

    • In C++11 there are some nice new convert functions from std::string to a number type.

    So instead of 

    atoi( str.c_str() )

    you can use 

    std::stoi( str )

    where str is your number as std::string .

    There are version for all flavours of numbers: long stol(string) , float stof(string) , double stod(string) ,... see http://en.cppreference.com/w/cpp/string/basic_string/stol 

    std::istringstream ss(thestring);
ss >> thevalue;

    要完全正确，您需要检查错误标志。

    use the atoi function to convert the string to an integer: 

    string a = "25";

int b = atoi(a.c_str());

    http://www.cplusplus.com/reference/clibrary/cstdlib/atoi/

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