Assert, Atan, atanf, Assert atan, atanf – Zilog ZUSBOPTS User Manual
Page 437: Example, Synopsis, Returns
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
void assert(int expression);
Returns
If expression is true (that is, evaluates to nonzero), the
assert
macro returns no value.
Example
#include
char str[] = "COMPASS";
void main(void)
{
assert(str[0] == 'B');
}
atan, atanf
Computes the principal value of the arc tangent of x.
Synopsis
#include
double atan(double x);
float atanf(float x);
Returns
The arc tangent in the range (-pi/2, +pi/2).