diff options
Diffstat (limited to 'contrib/libf2c/libF77/c_sqrt.c')
| -rw-r--r-- | contrib/libf2c/libF77/c_sqrt.c | 51 |
1 files changed, 23 insertions, 28 deletions
diff --git a/contrib/libf2c/libF77/c_sqrt.c b/contrib/libf2c/libF77/c_sqrt.c index 8481ee4..81b72fc 100644 --- a/contrib/libf2c/libF77/c_sqrt.c +++ b/contrib/libf2c/libF77/c_sqrt.c @@ -1,35 +1,30 @@ #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); +extern double f__cabs (double, double); -void c_sqrt(complex *r, complex *z) -#endif +void +c_sqrt (complex * r, complex * z) { - double mag, t; - double zi = z->i, zr = z->r; + double mag, t; + double zi = z->i, zr = z->r; - if( (mag = f__cabs(zr, zi)) == 0.) - r->r = r->i = 0.; - else if(zr > 0) - { - r->r = t = sqrt(0.5 * (mag + zr) ); - t = zi / t; - r->i = 0.5 * t; - } - else - { - t = sqrt(0.5 * (mag - zr) ); - if(zi < 0) - t = -t; - r->i = t; - t = zi / t; - r->r = 0.5 * t; - } - } + if ((mag = f__cabs (zr, zi)) == 0.) + r->r = r->i = 0.; + else if (zr > 0) + { + r->r = t = sqrt (0.5 * (mag + zr)); + t = zi / t; + r->i = 0.5 * t; + } + else + { + t = sqrt (0.5 * (mag - zr)); + if (zi < 0) + t = -t; + r->i = t; + t = zi / t; + r->r = 0.5 * t; + } +} |
