atof |
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atof |
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atof |
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atof |
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double atof( char *s )
char *s; /* string to be converted */
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Synopsis |
#include "stdlib.h"
The atof function returns the value of an ASCII text string representation of a floating point number. atof stops reading the input string at the first character that it cannot recognize as part of a number.
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Parameters |
s should be a null-terminated string with the following format:
[whitespace][sign][digits][.digits][{e | E}[sign]digits]
where [whitespace] is a sequence of tab or space characters, [sign] is either plus ('+') or minus ('-'), and [digits] is one or more decimal digits.
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Return Value |
If s is empty, or no digits are found, or if the only digits found are in the exponent (i.e. following the e or E), then atof returns 0. If the result cannot be represented, then the return value is undefined.
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See Also |
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