?? pow_zi.c
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#include "complex"pow_zi(p, a, b) /* p = a**b */dcomplex *p, *a;long int *b;{long int n;double t;dcomplex x;n = *b;p->dreal = 1;p->dimag = 0;if(n == 0) return;if(n < 0) { n = -n; z_div(&x, a); }else { x.dreal = a->dreal; x.dimag = a->dimag; }for( ; ; ) { if(n & 01) { t = p->dreal * x.dreal - p->dimag * x.dimag; p->dimag = p->dreal * x.dimag + p->dimag * x.dreal; p->dreal = t; } if(n >>= 1) { t = x.dreal * x.dreal - x.dimag * x.dimag; x.dimag = 2 * x.dreal * x.dimag; x.dreal = t; } else break; }}?? 快捷鍵說明
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