37 lines
717 B
C
37 lines
717 B
C
#include "f2c.h"
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#ifdef KR_headers
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extern void sig_die();
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VOID z_div(c, a, b) doublecomplex *a, *b, *c;
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#else
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extern void sig_die(char*, int);
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void z_div(doublecomplex *c, doublecomplex *a, doublecomplex *b)
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#endif
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{
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double ratio, den;
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double abr, abi;
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double ai = a->i, ar = a->r, bi = b->i, br = b->r;
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if( (abr = br) < 0.)
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abr = - abr;
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if( (abi = bi) < 0.)
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abi = - abi;
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if( abr <= abi )
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{
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if(abi == 0)
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sig_die("complex division by zero", 1);
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ratio = br / bi ;
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den = bi * (1 + ratio*ratio);
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c->r = (ar*ratio + ai) / den;
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c->i = (ai*ratio - ar) / den;
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}
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else
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{
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ratio = bi / br ;
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den = br * (1 + ratio*ratio);
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c->r = (ar + ai*ratio) / den;
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c->i = (ai - ar*ratio) / den;
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}
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}
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