| /contrib/sdk/sources/newlib/libc/stdlib/__exp10.c |
|---|
| 0,0 → 1,30 |
| /* |
| * compute 10**x by successive squaring. |
| */ |
| #include <_ansi.h> |
| #include "std.h" |
| double |
| _DEFUN (__exp10, (x), |
| unsigned x) |
| { |
| static _CONST double powtab[] = |
| {1.0, |
| 10.0, |
| 100.0, |
| 1000.0, |
| 10000.0}; |
| if (x < (sizeof (powtab) / sizeof (double))) |
| return powtab[x]; |
| else if (x & 1) |
| { |
| return 10.0 * __exp10 (x - 1); |
| } |
| else |
| { |
| double n = __exp10 (x / 2); |
| return n * n; |
| } |
| } |