2013-09-29 00:21:18 +04:00
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/* j/1/sub.c
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**
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** This file is in the public domain.
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*/
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#include "all.h"
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2014-09-04 07:10:43 +04:00
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2013-09-29 00:21:18 +04:00
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/* functions
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*/
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2014-09-04 01:33:18 +04:00
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u2_noun
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u2_cqa_sub(u2_atom a,
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u2_atom b)
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2013-09-29 00:21:18 +04:00
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{
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2014-08-25 10:58:38 +04:00
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if ( u2_so(u2_co_is_cat(a)) && u2_so(u2_co_is_cat(b)) ) {
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if ( a < b ) {
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return u2_cm_error("subtract-underflow");
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}
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else return (a - b);
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}
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else {
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mpz_t a_mp, b_mp;
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u2_cr_mp(a_mp, a);
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u2_cr_mp(b_mp, b);
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2013-09-29 00:21:18 +04:00
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2014-08-25 10:58:38 +04:00
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if ( mpz_cmp(a_mp, b_mp) < 0 ) {
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mpz_clear(a_mp);
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mpz_clear(b_mp);
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2013-09-29 00:21:18 +04:00
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2014-08-25 10:58:38 +04:00
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return u2_cm_error("subtract-underflow");
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}
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mpz_sub(a_mp, a_mp, b_mp);
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2013-09-29 00:21:18 +04:00
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mpz_clear(b_mp);
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2014-08-25 10:58:38 +04:00
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return u2_ci_mp(a_mp);
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2013-09-29 00:21:18 +04:00
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}
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}
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2014-09-04 01:33:18 +04:00
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u2_noun
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2014-09-03 09:46:55 +04:00
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u2_cwa_sub(
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2014-09-04 01:33:18 +04:00
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u2_noun cor)
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2013-09-29 00:21:18 +04:00
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{
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u2_noun a, b;
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2014-08-20 01:49:16 +04:00
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if ( (u2_no == u2_cr_mean(cor, u2_cv_sam_2, &a, u2_cv_sam_3, &b, 0)) ||
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(u2_no == u2ud(a)) ||
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(u2_no == u2ud(b)) )
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2013-09-29 00:21:18 +04:00
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{
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2014-08-20 01:49:16 +04:00
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return u2_cm_bail(c3__exit);
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2013-09-29 00:21:18 +04:00
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} else {
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2014-09-03 07:36:29 +04:00
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return u2_cqa_sub(a, b);
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2013-09-29 00:21:18 +04:00
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}
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}
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