atof()

  #include <stdlib.h>

  

  double atof(const char *s);

  

atof() converts the string s to a double floating point 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 atof is the following:

  FloatNum        = Sign{Digit}[.{Digit}][Exp]

  

  Sign            = [+|-]

  

  Digit           = <any decimal digit from 0 to 9>

  

  Exp             = (e|E) SignDigit{Digit}

  

atof() returns the converted double floating point value.

atoi(),

strtod(),

strtol(), and

strtoul()