ex_acos.nxc

This is an example of how to use the acos function.

// ex_acos.nxc
// Display values of the acos API call.
// This program runs indefinitely -- press gray button to exit.
// Reguires enhanced firmware 1.28 or later.

#define MIN_VAL -1.0
#define MID_VAL 0.0
#define MAX_VAL 1.0
#define INVALID 2.0

inline void show_acos(const float val, const int screen_y)
{
   TextOut(0, screen_y, FormatNum("%7.4f RAD", acos(val)));
}

task main()
{
   show_acos(MIN_VAL, LCD_LINE1); // shows 3.1416 RAD
   show_acos(MID_VAL, LCD_LINE2); // shows 1.5708 RAD
   show_acos(MAX_VAL, LCD_LINE3); // shows 0.0000 RAD
   // An invalid value returns not-a-number (nan).
   show_acos(INVALID, LCD_LINE4); // shows   -nan RAD
   while (true);
}