Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 438)

100

101

Standard Functions UM017105-0511

410

Zilog Developer Studio II – ZNEO™

User Manual

Example

double y=.1234;

double x;

x=atan(y);

atan2, atan2f

Computes the principal value of the arc tangent of y/x, using the signs of both arguments

to determine the quadrant of the return value. A domain error occurs if both arguments are

zero.

Synopsis

#include <math.h>

double atan2(double y, double x);

float atan2f(float y, float x);

Returns

The arc tangent of y/x, in the range [-pi, +pi].

Example

double y=.1234;

double x=.4321;

double z;

z=atan2(y,x);

atof, atoff

Converts the string pointed to by nptr to double representation. Except for the behavior on

error,

atof is equivalent to strtod (nptr, (char **)NULL), and atoff is equiva-

lent to

strtof (nptr, (char **)NULL).

Synopsis

#include <stdlib.h> 

double atof(const char *nptr);

float atoff(const char *nptr);

Returns

The converted value.

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