atol()

  #include <stdlib.h>

  

  long atol(const char *s);

  

atol() converts the string s to an long value, skipping over white space at the beginning of s. It stops converting when it reaches either the end of the string or a character that cannot be part of the number. The number format accepted by atol() is the following:

Number = [+|-]Digit{Digit}

atol() returns the converted long value.

atoi(),

atof(),

strtod(),

strtol(), and

strtoul()