<html><head><metahttp-equiv="X-UA-Compatible"content="IE=edge"/><linkrel="shortcut icon"href="../icons/favicon.ico"/><linkrel="stylesheet"type="text/css"href="../styles/branding.css"/><linkrel="stylesheet"type="text/css"href="../styles/branding-en-US.css"/><scripttype="text/javascript"src="../scripts/branding.js"></script><metahttp-equiv="Content-Type"content="text/html; charset=UTF-8"/><title>gmp_lib.mpf_random2 Method </title><metaname="Language"content="en-us"/><metaname="System.Keywords"content="mpf_random2 method"/><metaname="System.Keywords"content="gmp_lib.mpf_random2 method"/><metaname="Microsoft.Help.F1"content="Math.Gmp.Native.gmp_lib.mpf_random2"/><metaname="Microsoft.Help.Id"content="M:Math.Gmp.Native.gmp_lib.mpf_random2(Math.Gmp.Native.mpf_t,Math.Gmp.Native.mp_size_t,Math.Gmp.Native.mp_exp_t)"/><metaname="Description"content="Generate a random float of at most limbs, with long strings of zeros and ones in the binary representation."/><metaname="Microsoft.Help.ContentType"content="Reference"/><metaname="BrandingAware"content="true"/><metaname="container"content="Math.Gmp.Native"/><metaname="file"content="cc6e8f51-f396-f6c3-c6e4-9a9aeeaf2a13"/><metaname="guid"content="cc6e8f51-f396-f6c3-c6e4-9a9aeeaf2a13"/><linktype="text/css"rel="stylesheet"href="../styles/highlight.css"/><scripttype="text/javascript"src="../scripts/highlight.js"></script><linkrel="stylesheet"type="text/css"href="../styles/branding-Website.css"/><scripttype="text/javascript"src="../scripts/jquery-1.11.0.min.js"></script><scripttype="text/javascript"src="../scripts/branding-Website.js"></script><scripttype="text/javascript"src="../scripts/clipboard.min.js"></script></head><bodyonload="OnLoad('cs')"><inputtype="hidden"id="userDataCache"class="userDataStyle"/><divclass="pageHeader"id="PageHeader">GMP Native Interface for .NET<formid="SearchForm"method="get"action="#"onsubmit="javascript:TransferToSearchPage(); return false;"><inputid="SearchTextBox"type="text"maxlength="200"/><buttonid="SearchButton"type="submit"></button></form></div><divclass="pageBody"><divclass="leftNav"id="leftNav"><divid="tocNav"><divclass="toclevel0"data-toclevel="0"><aclass="tocCollapsed"onclick="javascript: Toggle(this);"href="#!"/><adata-tochassubtree="true"href="846f5c8a-6cba-433e-9f18-cde2ff5695cd.htm"title="GMP Native Interface for .NET"tocid="roottoc">GMP Native Interface for .NET</a></div><divclass="toclevel0"data-toclevel="0"><aclass="tocCollapsed"onclick="javascript: Toggle(this);"href="#!"/><adata-tochassubtree="true"href="d9c51b9f-0c54-770b-28ea-6eebd8fef368.htm"title="Math.Gmp.Native"tocid="d9c51b9f-0c54-770b-28ea-6eebd8fef368">Math.Gmp.Native</a></div><divclass="toclevel0"data-toclevel="0"><aclass="tocCollapsed"onclick="javascript: Toggle(this);"href="#!"/><adata-tochassubtree="true"href="3af6b34c-3242-2b75-e7c7-ab79af8a4b0f.htm"title="gmp_lib Class"tocid="3af6b34c-3242-2b75-e7c7-ab79af8a4b0f">gmp_lib Class</a></div><divclass="toclevel1"data-toclevel="1"data-childrenloaded="true"><aclass="tocExpanded"onclick="javascript: Toggle(this);"href="#!"/><adata-tochassubtree="true"href="0fa7cbf3-e8f4-6b14-d829-8aa663e77c74.htm"title="gmp_lib Methods"tocid="0fa7cbf3-e8f4-6b14-d829-8aa663e77c74">gmp_lib Methods</a></div><divclass="toclevel2"data-toclevel="2"><adata-tochassubtree="false"href="c9cb6a67-59b8-5c03-f31d-f252441c53f6.htm"title="_mpz_realloc Method "tocid="c9cb6a67-59b8-5c03-f31d-f252441c53f6">_mpz_realloc Method </a></div><divclass="toclevel2"data-toclevel="2"><adata-tochassubtree="false"href="2c68671c-cd5c-e2ec-52a2-65b0ca31c3d1.htm"title="allocate Method "tocid="2c68671c-cd5c-e2ec-52a2-65b0ca31c3d1">allocate Method </a></div><divclass="toclevel2"data-toclevel="2"><aclass="tocCollapsed"onclick="javascript: Toggle(this);"href="#!"/><adata-tochassubtree="true"href="92160da3-b1af-e005-cb05-e3fb4dd524d8.htm"title="free Method "tocid="92160da3-b1af-e005-cb05-e3fb4dd524d8">free Method </a></div><divclass="t
</pre></div></div></div><scripttype="text/javascript">AddLanguageTabSet("ID0EDCA");</script><h4class="subHeading">Parameters</h4><dl><dt><spanclass="parameter">rop</span></dt><dd>Type:<ahref="37c88d6c-8d02-2330-ad77-f20fb73d1677.htm">Math.Gmp.Native<spanid="LSTF82FFB88_1"></span><scripttype="text/javascript">AddLanguageSpecificTextSet("LSTF82FFB88_1?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>mpf_t</a><br/>The result float.</dd><dt><spanclass="parameter">max_size</span></dt><dd>Type:<ahref="4b58a584-7a0e-b600-18fa-ebd493861eb3.htm">Math.Gmp.Native<spanid="LSTF82FFB88_2"></span><scripttype="text/javascript">AddLanguageSpecificTextSet("LSTF82FFB88_2?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>mp_size_t</a><br/>The maximum number of limbs.</dd><dt><spanclass="parameter">exp</span></dt><dd>Type:<ahref="e6a17880-791f-37d4-4942-cf26ce7d4cbf.htm">Math.Gmp.Native<spanid="LSTF82FFB88_3"></span><scripttype="text/javascript">AddLanguageSpecificTextSet("LSTF82FFB88_3?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>mp_exp_t</a><br/>The range of the random exponent.</dd></dl></div><divclass="collapsibleAreaRegion"><spanclass="collapsibleRegionTitle"onclick="SectionExpandCollapse('ID2RB')"onkeypress="SectionExpandCollapse_CheckKey('ID2RB', event)"tabindex="0"><imgid="ID2RBToggle"class="collapseToggle"src="../icons/SectionExpanded.png"/>Remarks</span></div><divid="ID2RBSection"class="collapsibleSection"><p>
This function is useful for testing functions and algorithms, since these kind of random numbers have proven to be more
likely to trigger corner-case bugs.
Negative random numbers are generated when <spanclass="parameter">max_size</span> is negative.
</p></div><divclass="collapsibleAreaRegion"><spanclass="collapsibleRegionTitle"onclick="SectionExpandCollapse('ID3RB')"onkeypress="SectionExpandCollapse_CheckKey('ID3RB', event)"tabindex="0"><imgid="ID3RBToggle"class="collapseToggle"src="../icons/SectionExpanded.png"/>Examples</span></div><divid="ID3RBSection"class="collapsibleSection"><divclass="codeSnippetContainer"><divclass="codeSnippetContainerTabs"><divid="ID0EDAABA_tab1"class="codeSnippetContainerTab"><ahref="#"onclick="javascript:ChangeTab('ID0EDAABA','cs','1','4');return false;">C#</a></div><divid="ID0EDAABA_tab2"class="codeSnippetContainerTab"><ahref="#"onclick="javascript:ChangeTab('ID0EDAABA','vb','2','4');return false;">VB</a></div><divid="ID0EDAABA_tab3"class="codeSnippetContainerTabPhantom"><ahref="#"onclick="javascript:ChangeTab('ID0EDAABA','cpp','3','4');return false;">C++</a></div><divid="ID0EDAABA_tab4"class="codeSnippetContainerTabPhantom"><ahref="#"onclick="javascript:ChangeTab('ID0EDAABA','fs','4','4');return false;">F#</a></div></div><divclass="codeSnippetContainerCodeContainer"><divclass="codeSnippetToolBar"><divclass="codeSnippetToolBarText"><aid="ID0EDAABA_copyCode"href="#"class="copyCodeSnippet"onclick="javascript:CopyToClipboard('ID0EDAABA');return false;"title="Copy">Copy</a></div></div><divid="ID0EDAABA_code_Div1"class="codeSnippetContainerCode"style="display: block"><prexml:space="preserve"><spanclass="highlight-comment">// Create, initialize, and set the value of rop to 0.</span>
<spanclass="highlight-comment">// Free all memory occupied by rop.</span>
gmp_lib.mpf_clear(rop);</pre></div><divid="ID0EDAABA_code_Div2"class="codeSnippetContainerCode"style="display: none"><prexml:space="preserve"><spanclass="highlight-comment">' Create, initialize, and set the value of rop to 0.</span>
gmp_lib.mpf_clear(rop)</pre></div><divid="ID0EDAABA_code_Div3"class="codeSnippetContainerCode"style="display: none"><p>No code example is currently available or this language may not be supported.</p></div><divid="ID0EDAABA_code_Div4"class="codeSnippetContainerCode"style="display: none"><p>No code example is currently available or this language may not be supported.</p></div></div></div><scripttype="text/javascript">AddLanguageTabSet("ID0EDAABA");</script></div><divclass="collapsibleAreaRegion"id="seeAlsoSection"><spanclass="collapsibleRegionTitle"onclick="SectionExpandCollapse('ID4RB')"onkeypress="SectionExpandCollapse_CheckKey('ID4RB', event)"tabindex="0"><imgid="ID4RBToggle"class="collapseToggle"src="../icons/SectionExpanded.png"/>See Also</span></div><divid="ID4RBSection"class="collapsibleSection"><h4class="subHeading">Reference</h4><divclass="seeAlsoStyle"><ahref="3af6b34c-3242-2b75-e7c7-ab79af8a4b0f.htm">gmp_lib Class</a></div><divclass="seeAlsoStyle"><ahref="d9c51b9f-0c54-770b-28ea-6eebd8fef368.htm">Math.Gmp.Native Namespace</a></div><divclass="seeAlsoStyle"><ahref="9b4a5f6b-3f8e-a957-ae84-303c6897aeb4.htm">mpf_ceil</a></div><divclass="seeAlsoStyle"><ahref="f7584918-b77f-3524-eea2-04134a2c3ba6.htm">mpf_floor</a></div><divclass="seeAlsoStyle"><ahref="3ac2ecd4-f154-de62-9170-b2d28f362a7e.htm">mpf_trunc</a></div><divclass="seeAlsoStyle"><ahref="11a036ec-5052-7dc4-bdb6-10e5c92f88cc.htm">mpf_integer_p</a></div><divclass="seeAlsoStyle"><ahref="d1b172bb-9c87-c255-a736-4b8ef1f6a5fe.htm">mpf_fits_ulong_p</a></div><divclass="seeAlsoStyle"><ahref="6c178e2d-a080-13b8-75b0-3fe232b46d75.htm">mpf_fits_slong_p</a></div><divclass="seeAlsoStyle"><ahref="201b1b12-bb0c-6a53-c6d5-e75db73f8470.htm">mpf_fits_uint_p</a></div><divclass="seeAlsoStyle"><ahref="5ea7691b-2a0f-5f25-290c-54c78e2cf3bd.htm">mpf_fits_sint_p</a></div><divclass="seeAlsoStyle"><ahref="ada84e5e-397e-e963-7d50-e260d4a104f7.htm">mpf_fits_ushort_p</a></div><divclass="seeAlsoStyle"><ahref="142199e1-6aef-83d5-1986-1b1248ddc6e3.htm">mpf_fits_sshort_p</a></div><divclass="seeAlsoStyle"><ahref="5a698221-639e-333b-061b-0aa3f76c38e9.htm">mpf_urandomb</a></div><divclass="seeAlsoStyle"><ahref="3af6b34c-3242-2b75-e7c7-ab79af8a4b0f.htm"><ahref="/html/3af6b34c-3242-2b75-e7c7-ab79af8a4b0f.htm#Miscellaneous_Float_Functions">Miscellaneous Float Functions</a></a></div><divclass="seeAlsoStyle"><ahref="3af6b34c-3242-2b75-e7c7-ab79af8a4b0f.htm"><ahref="https://gmplib.org/manual/Miscellaneous-Float-Functions.html#Miscellaneous-Float-Functions">GNU MP - Miscellaneous Float Functions</a></a></div></div></div></div><divid="pageFooter"class="pageFooter"></div></body></html>