pow_ri.c

来自「NIST Handwriting OCR Testbed」· C语言 代码 · 共 35 行

#include <f2c.h>

#ifdef KR_headers
double pow_ri(ap, bp) real *ap; integer *bp;
#else
double pow_ri(real *ap, integer *bp)
#endif
{
double pow, x;
integer n;

pow = 1;
x = *ap;
n = *bp;

if(n != 0)
	{
	if(n < 0)
		{
		n = -n;
		x = 1/x;
		}
	for( ; ; )
		{
		if(n & 01)
			pow *= x;
		if(n >>= 1)
			x *= x;
		else
			break;
		}
	}
return(pow);
}