CodeCogs®atof
convert <span class="Tn">ASCII</span> string to double
INTERFACE
#include <stdlib.h> double atof ( const char *nptr ) #include <xlocale.h> double atof_l ( const char *nptr, locale_t loc )
DESCRIPTION
The atof function converts the initial portion of the string pointed to by \c nptr to double representation. It is equivalent to:
strtod(nptr, (char **)NULL);The decimal point character is defined in the program's locale (category LC_NUMERIC). While the atof function uses the current locale, the atof_l function may be passed a locale directly. See xlocale for more information.
Example 1
\code #include <stdio.h> #include <stdlib.h> int main() { char x[10] = "3.141592"; double pi = atof(x); printf("pi = %lf
", pi); return 0; } \endcode
Output:
pi = 3.141592IMPLEMENTATION NOTES
The atof function is not thread-safe and also not async-cancel-safe.
The atof function has been deprecated by strtod and should not be used in new code.
ERRORS
The function atof need not affect the value of errno on an error.