93 lines
1.4 KiB
C++
93 lines
1.4 KiB
C++
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//-----------------------------------------------------------------------------
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//
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// Name: product
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//
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// Syntax: product(var, minval, maxval, expr)
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//
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// Input: cadr(p1) var
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//
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// caddr(p1) minval
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//
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// cadddr(p1) maxval
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//
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// caddddr(p1) expr
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//
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// Output: Product on stack
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//
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// Notes: The original value of var is restored before the
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// product function returns.
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//
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// Expr is quoted. It is not evaluated until var is
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// assigned minval.
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//
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//-----------------------------------------------------------------------------
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#include "stdafx.h"
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#include "defs.h"
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static void product(void);
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#define F p1
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#define X p2
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// here from eval.c
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void
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eval_product(void)
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{
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push(cadr(p1));
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push(caddr(p1));
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eval();
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push(cadddr(p1));
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eval();
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push(caddddr(p1));
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product();
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}
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static void
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product(void)
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{
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int i, j, k;
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F = pop();
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k = pop_integer();
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j = pop_integer();
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X = pop();
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if (!issymbol(X))
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stop("1st arg in product function: symbol expected");
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if (j == (int) 0x80000000)
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stop("2nd arg in product function: integer expected");
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if (k == (int) 0x80000000)
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stop("3rd arg in product function: integer expected");
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push_integer(1);
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for (i = j; i <= k; i++) {
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push(F);
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push(X);
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push_integer(i);
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evalat();
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multiply();
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}
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}
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static char *s[] = {
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"n=quote(n)",
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"",
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"product(n,1,4,n)",
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"24",
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"n",
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"n",
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};
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void
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test_product(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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