Difference between atoi and stoi

[cpp1024]

What is the difference between atoi and stoi?

[jlb]

Basically the C function atoi() converts C-strings (nul terminated character arrays) to an integer. The C++ stoi() converts the C++ string to an integer. Note that the atoi() function will silently fail if the string is not convertible to an int, while by default stoi() will throw an exception.

[keskiverto]

You can read the description of each:
http://www.cplusplus.com/reference/cstdlib/atoi/
http://www.cplusplus.com/reference/string/stoi/