Testing atoi I have noticed that from 2 ^ 63 returns 0 if the number that should return is negative, and -1 if the number that should return is positive, someone has an idea why?
Testing atoi I have noticed that from 2 ^ 63 returns 0 if the number that should return is negative, and -1 if the number that should return is positive, someone has an idea why?
The purpose of the int atoi (const char * str) function is to convert a string representing an integer to an integer. As documented here , if the converted figure falls outside the range that a int can represent ( LONG_MIN and LONG_MAX defined in limits.h ) then the behavior is undefined.
It will then depend on the compiler you are using to know the reason for the observed behavior.