SW006013 Microchip Technology, SW006013 Datasheet - Page 157

• 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

© 2008 Microchip Technology Inc.
atan2f
Description:
Include:
Prototype:
Arguments:
Return Value:
Remarks:
Example:
Calculates the trigonometric arc tangent function of y/x.
<math.h>
float atan2f (float y, float x);
y
x
Returns the arc tangent in radians in the range of -pi to pi with the
quadrant determined by the signs of both parameters.
A domain error occurs if both x and y are zero or both x and y are
+/- infinity.
#include <math.h>
#include <stdio.h> /* for printf, perror */
#include <errno.h> /* for errno
int main(void)
{
}
Output:
The arctangent of 2.000000/0.000000 is 1.570796
The arctangent of 0.000000/-1.000000 is 3.141593
Error: domain error
The arctangent of 0.000000/0.000000 is nan
float x, y, z;
errno = 0;
x = 2.0F;
y = 0.0F;
z = atan2f (y, x);
if (errno)
printf("The arctangent of %f/%f is %f\n\n",
errno = 0;
x = 0.0F;
y = -1.0F;
z = atan2f (y, x);
if (errno)
printf("The arctangent of %f/%f is %f\n\n",
errno = 0;
x = 0.0F;
y = 0.0F;
z = atan2f (y, x);
if (errno)
printf("The arctangent of %f/%f is %f\n\n",
perror("Error");
perror("Error");
perror("Error");
y, x, z);
y, x, z);
y, x, z);
y value for which to return the arc tangent
x value for which to return the arc tangent
/* for atan2f
DS51456E-page 153
*/
*/