SW006013 Microchip Technology, SW006013 Datasheet - Page 174

• 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 170
ldexp (Continued)
ldexpf
Description:
Include:
Prototype:
Arguments:
Return Value:
Remarks:
Example:
For a number = -0.625000 and an exponent = 2
For a number = 2.500000 and an exponent = 3
Error: range error
For a number = 15.000000 and an exponent = 10000
Calculates the result of a single precision floating-point number multi-
plied by an exponent of 2.
<math.h>
float ldexpf(float x, int ex);
x
ex
Returns x * 2^ex. On an overflow, ldexp returns inf and on an
underflow, ldexp returns 0.
A range error will occur on overflow or underflow.
#include <math.h>
#include <stdio.h> /* for printf, perror */
#include <errno.h> /* for errno
int main(void)
{
Output:
ldexp(-0.625000, 2) = -2.500000
ldexp(2.500000, 3) = 20.000000
ldexp(15.000000, 10000) = inf
float x,y;
int n;
errno = 0;
x = -0.625F;
n = 2;
y = ldexpf (x, n);
if (errno)
printf("For a number = %f and an exponent = %d\n",
printf("
errno = 0;
x = 2.5F;
n = 3;
y = ldexpf (x, n);
if (errno)
printf("For a number = %f and an exponent = %d\n",
printf("
perror("Error");
perror("Error");
floating-point value
integer exponent
x, n);
x, n, y);
x, n);
x, n, y);
ldexpf(%f, %d) = %f\n\n",
ldexpf(%f, %d) = %f\n\n",
/* for ldexpf
© 2008 Microchip Technology Inc.
*/
*/