SW006013 Microchip Technology, SW006013 Datasheet - Page 98

• Manufacturer Part Number: SW006013
• Description: MPLAB C Compiler For DsPIC DSCs
• Manufacturer: Microchip Technology
• Series: DsPIC30F/33Fr
• Type: MPLAB® C Compilerr

Specifications of SW006013

• Supported Families: DsPIC30F, DsPIC33F
• Core Architecture: DsPIC
• Kit Contents: Software And Docs
• Mcu Supported Families: DsPIC30F And DsPIC33F
• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: dsPIC
• Lead Free Status / RoHS Status: na
• For Use With/related Products: dSPIC DSCs
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

DS51456E-page 94
atof
Description:
Include:
Prototype:
Argument:
Return Value:
Remarks:
Example:
Converts a string to a double precision floating-point value.
<stdlib.h>
double atof(const char *s);
s
Returns the converted value if successful; otherwise, returns 0.
The number may consist of the following:
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>
#include <stdlib.h> /* for atof
int main(void)
{
}
Output:
String = "1.28"
String = "27.835:e2" float = 2783.500000
String = "Number1"
[whitespace] [sign] digits [.digits]
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\"
[ { e | E }[sign]digits]
pointer to the string to be converted
/* for printf */
float = 1.280000
float = 0.000000
float = %f\n", c, x);
© 2008 Microchip Technology Inc.
*/