How to use strtol function in C to convertt string into integer.

Answer 1

* For C-String to int use `atoi`

http://en.cppreference.com/w/c/string/byte/atoi

* For C-String to long use `strtol`

http://www.cplusplus.com/reference/cstdlib/strtol/

Hth, cmiiw

Answer 2

You can also use input string streams for this purpose.

Answer 3

int x;
string y = ''123456'';
stringstream ston(y) ;
ston >> x;