24 lines
461 B
C
24 lines
461 B
C
|
extern double POWR();
|
||
|
|
double TIMESTE(pow, a)
|
||
|
|
double a;
|
||
|
|
int pow;
|
||
|
|
{ int p ;
|
||
|
|
register double n, t, r, s;
|
||
|
|
p = pow < 0 ? -pow : pow;
|
||
|
|
n = 5.0;
|
||
|
|
t = 2.0;
|
||
|
|
if ( (p & 1) == 0 ) {r = 1.0; s = 1.0; }
|
||
|
|
else {r = 5.0; s = 2.0; }
|
||
|
|
p >>= 1;
|
||
|
|
while ( p != 0 ) {
|
||
|
|
n *= n; t *= t;
|
||
|
|
if ( (p & 1) != 0 ) {r *= n; s *= t; }
|
||
|
|
p >>= 1;
|
||
|
|
}
|
||
|
|
if (pow<0) {
|
||
|
|
return((a/r)/s);
|
||
|
|
} else {
|
||
|
|
return((a*r)*s);
|
||
|
|
}
|
||
|
|
}
|