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16-Bit Language Tools Libraries
atof
Description:
Include:
Prototype:
Converts a string to a double precision floating-point value.
<stdlib.h>
double atof(const char * s );
Argument:
s
pointer to the string to be converted
Return Value:
Remarks:
Example:
Returns the converted value if successful; otherwise, returns 0.
The number may consist of the following:
[whitespace] [sign] digits [.digits]
[ { e | E }[sign]digits]
optional whitespace , followed by an optional sign then a sequence
of one or more digits with an optional decimal point, followed by one
or more optional digits and an optional e or E followed by an optional
signed exponent. The conversion stops when the first unrecognized
character is reached. The conversion is the same as strtod(s,0)
except it does no error checking so errno will not be set.
#include <stdio.h> /* for printf */
#include <stdlib.h> /* for atof */
int main(void)
{
char a[] = " 1.28";
char b[] = "27.835e2";
char c[] = "Number1";
double x;
x = atof(a);
printf("String = \"%s\" float = %f\n", a, x);
x = atof(b);
printf("String = \"%s\" float = %f\n", b, x);
x = atof(c);
printf("String = \"%s\"
float = %f\n", c, x);
}
Output:
String = "1.28" float = 1.280000
String = "27.835:e2" float = 2783.500000
String = "Number1" float = 0.000000
DS51456E-page 94
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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