+/*
+ * "@(#)c_div.c 1.1"
+ */
+
+#include "complex"
+
+c_div(c, a, b)
+complex *a, *b, *c;
+{
+double ratio, den;
+double abr, abi;
+
+if( (abr = b->real) < 0.)
+ abr = - abr;
+if( (abi = b->imag) < 0.)
+ abi = - abi;
+if( abr <= abi )
+ {
+ if(abi == 0)
+ abort(); /* fatal("complex division by zero"); */
+ ratio = b->real / b->imag ;
+ den = b->imag * (1 + ratio*ratio);
+ c->real = (a->real*ratio + a->imag) / den;
+ c->imag = (a->imag*ratio - a->real) / den;
+ }
+
+else
+ {
+ ratio = b->imag / b->real ;
+ den = b->real * (1 + ratio*ratio);
+ c->real = (a->real + a->imag*ratio) / den;
+ c->imag = (a->imag - a->real*ratio) / den;
+ }
+
+}