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atof - convert a string to a double
#include <stdlib.h> double atof(const char *nptr);
The atof() function converts the initial portion of the string pointed to by nptr to double. The behavior is the same as strtod(nptr, (char **) NULL); except that atof() does not detect errors.
The converted value.
SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
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