52 lines
601 B
C++
52 lines
601 B
C++
// Multiply rational numbers
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//
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// Input: tos-2 multiplicand
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//
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// tos-1 multiplier
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//
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// Output: product on stack
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#include "stdafx.h"
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#include "defs.h"
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void
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qmul(void)
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{
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unsigned int *aa, *bb, *c;
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save();
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p2 = pop();
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p1 = pop();
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// zero?
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if (MZERO(p1->u.q.a) || MZERO(p2->u.q.a)) {
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push(zero);
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restore();
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return;
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}
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aa = mmul(p1->u.q.a, p2->u.q.a);
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bb = mmul(p1->u.q.b, p2->u.q.b);
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c = mgcd(aa, bb);
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MSIGN(c) = MSIGN(bb);
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p1 = alloc();
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p1->k = NUM;
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p1->u.q.a = mdiv(aa, c);
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p1->u.q.b = mdiv(bb, c);
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mfree(aa);
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mfree(bb);
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mfree(c);
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push(p1);
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restore();
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}
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