====== Function FLOAT ====== ====Syntax==== * **float //number** ''&optional'' prototype// → //float// ====Arguments and Values==== * //number// - a //[[CL:Glossary:real]]//. * //prototype// - a //[[CL:Glossary:float]]//. * //float// - a //[[CL:Glossary:float]]//. ====Description==== **float** converts a //[[CL:Glossary:real]]// number to a //[[CL:Glossary:float]]//. If a //prototype// is supplied, a //[[CL:Glossary:float]]// is returned that is mathematically equal to //number// but has the same format as //prototype//. If //prototype// is not supplied, then if the //number// is already a //[[CL:Glossary:float]]//, it is returned; otherwise, a //[[CL:Glossary:float]]// is returned that is mathematically equal to //number// but is a //[[CL:Glossary:single float]]//. ====Examples==== <blockquote> (float 0) <r>0.0 </r> (float 1 .5) <r>1.0 </r> (float 1.0) <r>1.0</r> (float 1/2) <r>0.5</r> ([[CL:Functions:eql]] (float 1.0 1.0d0) 1.0d0) <r>//[[CL:Glossary:true]]//</r> </blockquote> ====Side Effects==== None. ====Affected By==== None. ====Exceptional Situations==== None. ====See Also==== * **[[CL:Functions:coerce|Function COERCE]]** ====Notes==== None. \issue{REAL-NUMBER-TYPE:X3J13-MAR-89}