74 lines
846 B
C++
74 lines
846 B
C++
#include "stdafx.h"
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#include "defs.h"
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void
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eval_numerator(void)
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{
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push(cadr(p1));
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eval();
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numerator();
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}
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void
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numerator(void)
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{
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int h;
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save();
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p1 = pop();
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if (car(p1) == symbol(ADD)) {
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push(p1);
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rationalize();
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p1 = pop();
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}
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if (car(p1) == symbol(MULTIPLY)) {
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h = tos;
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p1 = cdr(p1);
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while (iscons(p1)) {
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push(car(p1));
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numerator();
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p1 = cdr(p1);
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}
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multiply_all(tos - h);
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} else if (isrational(p1)) {
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push(p1);
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mp_numerator();
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} else if (car(p1) == symbol(POWER) && isnegativeterm(caddr(p1)))
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push(one);
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else
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push(p1);
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restore();
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}
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#if SELFTEST
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static char *s[] = {
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"numerator(2/3)",
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"2",
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"numerator(x)",
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"x",
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"numerator(1/x)",
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"1",
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"numerator(a+b)",
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"a+b",
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"numerator(1/a+1/b)",
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"a+b",
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};
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void
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test_numerator(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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#endif
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