Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 437)

100

101

UM017105-0511 Standard Functions

Zilog Developer Studio II – ZNEO™

User Manual

409

Example

double y=.1234;

double x;

x = asin(y);

assert

Puts diagnostics into programs. When it is executed, if expression is false (that is, eval-

uates to zero), the

assert macro writes information about the particular call that failed

(including the text of the argument, the name of the source file, and the source line num-

ber—the latter are respectively the values of the preprocessing macros

__FILE__ and

__LINE__) on the serial port using the printf() function. It then loops forever.

Synopsis

#include <assert.h>

void assert(int expression);

Returns

If expression is true (that is, evaluates to nonzero), the assert macro returns no value.

Example

#include <assert.h>

char str[] = "COMPASS";

void main(void)

{

assert(str[0] == 'B');

}

atan, atanf

Computes the principal value of the arc tangent of x.

Synopsis

#include <math.h>

double atan(double x);

float atanf(float x);

Returns

The arc tangent in the range (-pi/2, +pi/2).

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