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author | ljo <ljo@FreeBSD.org> | 1994-10-26 18:17:41 +0000 |
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committer | ljo <ljo@FreeBSD.org> | 1994-10-26 18:17:41 +0000 |
commit | 2195d627fb793fec6c00bdddf1c4d46982b9f27f (patch) | |
tree | c2961f38c1507b80baefaca1d568747c113f28c0 /lib/libF77/pow_ii.c | |
parent | 80b2e1963004e4ae0173b4f9bc965518ba81d3b0 (diff) | |
download | FreeBSD-src-2195d627fb793fec6c00bdddf1c4d46982b9f27f.zip FreeBSD-src-2195d627fb793fec6c00bdddf1c4d46982b9f27f.tar.gz |
Library for f2c (part 2 of 2)
Obtained from: netlib.att.com
Diffstat (limited to 'lib/libF77/pow_ii.c')
-rw-r--r-- | lib/libF77/pow_ii.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/libF77/pow_ii.c b/lib/libF77/pow_ii.c new file mode 100644 index 0000000..e794877 --- /dev/null +++ b/lib/libF77/pow_ii.c @@ -0,0 +1,31 @@ +#include "f2c.h" + +#ifdef KR_headers +integer pow_ii(ap, bp) integer *ap, *bp; +#else +integer pow_ii(integer *ap, integer *bp) +#endif +{ + integer pow, x, n; + + x = *ap; + n = *bp; + + if (n <= 0) { + if (n == 0 || x == 1) + return 1; + if (x != -1) + return x == 0 ? 1/x : 0; + n = -n; + } + for(pow = 1; ; ) + { + if(n & 01) + pow *= x; + if(n >>= 1) + x *= x; + else + break; + } + return(pow); + } |