atof
Convert ASCII 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 nptr todouble
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
#include <stdio.h> #include <stdlib.h> int main() { char x[10] = "3.141592"; double pi = atof(x); printf("pi = %lf\n", pi); return 0; }
Output:pi = 3.141592
Implementation 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.Last Modified: 18 Dec 11 @ 13:26 Page Rendered: 2022-03-14 15:47:26