diff options
Diffstat (limited to 'contrib/libf2c/libF77/z_sqrt.c')
| -rw-r--r-- | contrib/libf2c/libF77/z_sqrt.c | 42 |
1 files changed, 19 insertions, 23 deletions
diff --git a/contrib/libf2c/libF77/z_sqrt.c b/contrib/libf2c/libF77/z_sqrt.c index c04e8f0a1a72..954c2fa18896 100644 --- a/contrib/libf2c/libF77/z_sqrt.c +++ b/contrib/libf2c/libF77/z_sqrt.c @@ -1,29 +1,25 @@ #include "f2c.h" -#ifdef KR_headers -double sqrt(), f__cabs(); -VOID z_sqrt(r, z) doublecomplex *r, *z; -#else #undef abs #include "math.h" -extern double f__cabs(double, double); -void z_sqrt(doublecomplex *r, doublecomplex *z) -#endif +extern double f__cabs (double, double); +void +z_sqrt (doublecomplex * r, doublecomplex * z) { - double mag, zi = z->i, zr = z->r; + double mag, zi = z->i, zr = z->r; - if( (mag = f__cabs(zr, zi)) == 0.) - r->r = r->i = 0.; - else if(zr > 0) - { - r->r = sqrt(0.5 * (mag + zr) ); - r->i = zi / r->r / 2; - } - else - { - r->i = sqrt(0.5 * (mag - zr) ); - if(zi < 0) - r->i = - r->i; - r->r = zi / r->i / 2; - } - } + if ((mag = f__cabs (zr, zi)) == 0.) + r->r = r->i = 0.; + else if (zr > 0) + { + r->r = sqrt (0.5 * (mag + zr)); + r->i = zi / r->r / 2; + } + else + { + r->i = sqrt (0.5 * (mag - zr)); + if (zi < 0) + r->i = -r->i; + r->r = zi / r->i / 2; + } +} |