135 lines
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135 lines
8.8 KiB
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Comparison (Guile Reference Manual)</title>
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<div class="subsubsection-level-extent" id="Comparison">
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<p>
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Next: <a href="Conversion.html" accesskey="n" rel="next">Converting Numbers To and From Strings</a>, Previous: <a href="Integer-Operations.html" accesskey="p" rel="prev">Operations on Integer Values</a>, Up: <a href="Numbers.html" accesskey="u" rel="up">Numerical data types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
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<h4 class="subsubsection" id="Comparison-Predicates"><span>6.6.2.8 Comparison Predicates<a class="copiable-link" href="#Comparison-Predicates"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-zero_003f-2"></a>
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<a class="index-entry-id" id="index-positive_003f-2"></a>
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<a class="index-entry-id" id="index-negative_003f-2"></a>
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<p>The C comparison functions below always takes two arguments, while the
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Scheme functions can take an arbitrary number. Also keep in mind that
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the C functions return one of the Scheme boolean values
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<code class="code">SCM_BOOL_T</code> or <code class="code">SCM_BOOL_F</code> which are both true as far as C
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is concerned. Thus, always write <code class="code">scm_is_true (scm_num_eq_p (x,
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y))</code> when testing the two Scheme numbers <code class="code">x</code> and <code class="code">y</code> for
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equality, for example.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_003d"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">=</strong><a class="copiable-link" href="#index-_003d"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fnum_005feq_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_num_eq_p</strong> <var class="def-var-arguments">(x, y)</var><a class="copiable-link" href="#index-scm_005fnum_005feq_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if all parameters are numerically equal.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_003c"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name"><</strong><a class="copiable-link" href="#index-_003c"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fless_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_less_p</strong> <var class="def-var-arguments">(x, y)</var><a class="copiable-link" href="#index-scm_005fless_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if the list of parameters is monotonically
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increasing.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_003e"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">></strong><a class="copiable-link" href="#index-_003e"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fgr_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_gr_p</strong> <var class="def-var-arguments">(x, y)</var><a class="copiable-link" href="#index-scm_005fgr_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if the list of parameters is monotonically
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decreasing.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_003c_003d"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name"><=</strong><a class="copiable-link" href="#index-_003c_003d"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fleq_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_leq_p</strong> <var class="def-var-arguments">(x, y)</var><a class="copiable-link" href="#index-scm_005fleq_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if the list of parameters is monotonically
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non-decreasing.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_003e_003d"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">>=</strong><a class="copiable-link" href="#index-_003e_003d"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fgeq_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_geq_p</strong> <var class="def-var-arguments">(x, y)</var><a class="copiable-link" href="#index-scm_005fgeq_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if the list of parameters is monotonically
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non-increasing.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-zero_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">zero?</strong> <var class="def-var-arguments">z</var><a class="copiable-link" href="#index-zero_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fzero_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_zero_p</strong> <var class="def-var-arguments">(z)</var><a class="copiable-link" href="#index-scm_005fzero_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">z</var> is an exact or inexact number equal to
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zero.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-positive_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">positive?</strong> <var class="def-var-arguments">x</var><a class="copiable-link" href="#index-positive_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fpositive_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_positive_p</strong> <var class="def-var-arguments">(x)</var><a class="copiable-link" href="#index-scm_005fpositive_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">x</var> is an exact or inexact number greater than
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zero.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-negative_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">negative?</strong> <var class="def-var-arguments">x</var><a class="copiable-link" href="#index-negative_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fnegative_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_negative_p</strong> <var class="def-var-arguments">(x)</var><a class="copiable-link" href="#index-scm_005fnegative_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">x</var> is an exact or inexact number less than
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zero.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Conversion.html">Converting Numbers To and From Strings</a>, Previous: <a href="Integer-Operations.html">Operations on Integer Values</a>, Up: <a href="Numbers.html">Numerical data types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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