?? z_sqrt.c
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#include "complex"z_sqrt(r, z)dcomplex *r, *z;{double mag, sqrt(), cabs();if( (mag = cabs(z->dreal, z->dimag)) == 0.) r->dreal = r->dimag = 0.;else if(z->dreal > 0) { r->dreal = sqrt(0.5 * (mag + z->dreal) ); r->dimag = z->dimag / r->dreal / 2; }else { r->dimag = sqrt(0.5 * (mag - z->dreal) ); if(z->dimag < 0) z->dimag = - z->dimag; r->dreal = z->dimag / r->dimag / 2; }}?? 快捷鍵說明
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