arcsine unction demo in c

#include "math.h"
#include "errno.h"

double arcsine();

double asin(x)
double x;
return arcsine(x,0);

double acos(x)
double x;
return arcsine(x,1);

#define P1 -0.27368494524164255994e+2
#define P2 +0.57208227877891731407e+2
#define P3 -0.39688862997504877339e+2
#define P4 +0.10152522233806463645e+2
#define P5 -0.69674573447350646411
#define Q0 -0.16421096714498560795e+3
#define Q1 +0.41714430248260412556e+3
#define Q2 -0.38186303361750149284e+3
#define Q3 +0.15095270841030604719e+3
#define Q4 -0.23823859153670238830e+2

#define P(g) ((((P5*g P4)*g P3)*g P2)*g P1)
#define Q(g) (((((g Q4)*g Q3)*g Q2)*g Q1)*g Q0)

double arcsine(x,flg)
double x;
double y, g, r;
register int i;
extern int errno;
static double a[2] = { 0.0, 0.78539816339744830962 };
static double b[2] = { 1.57079632679489661923, 0.78539816339744830962 };

y = fabs(x);
i = flg;
if (y < 2.3e-10)
r = y;
else {
if (y > 0.5) {
i = 1-i;
if (y > 1.0) {
errno = EDOM;
return 0.0;
g = (0.5-y)+0.5;
g = ldexp(g,-1);
y = sqrt(g);
y = -(y+y);
} else
g = y*y;
r = y + y*
if (flg) {
if (x < 0.0)
r = (b[i] + r) + b[i];
r = (a[i] - r) + a[i];
} else {
r = (a[i] + r) + a[i];
if (x < 0.0)
r = -r;
return r;

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History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming

My 1st Program...

void main ()
clrscr ();
printf ("\n\n\n\n");
printf ("\t\t\t*******Pankaj *******\n");
printf ("\t\t\t********************************\n");
printf ("\t\t\t\"Life is Good...\"\n");
printf ("\t\t\t********************************");
getch ();

Next Step...


void main ()
clrscr ();
printf ("\n\n\n\n\n\n\n\n");
printf ("\t\t\t --------------------------- \n\n");

printf ("\t\t\t | IGCT, Info Computers, INDIA | \n\n");
printf ("\t\t\t --------------------------- ");

getch ();