syscons util remove use kbdcontrol & vidcontrol instead

[unix-history] / lib / libF77 / c_sqrt.c

#include "f2c.h"

#ifdef KR_headers
extern double sqrt(), f__cabs();

VOID c_sqrt(r, z) complex *r, *z;
#else
#undef abs
#include "math.h"
extern double f__cabs(double, double);

void c_sqrt(complex *r, complex *z)
#endif
{
double mag, t;

if( (mag = f__cabs(z->r, z->i)) == 0.)
       r->r = r->i = 0.;
else if(z->r > 0)
       {
       r->r = t = sqrt(0.5 * (mag + z->r) );
       t = z->i / t;
       r->i = 0.5 * t;
       }
else
       {
       t = sqrt(0.5 * (mag - z->r) );
       if(z->i < 0)
               t = -t;
       r->i = t;
       t = z->i / t;
       r->r = 0.5 * t;
       }
}