<html lang="en"> <head> <title>Integer Conversions - GNU Octave</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="GNU Octave"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="C_002dStyle-I_002fO-Functions.html#C_002dStyle-I_002fO-Functions" title="C-Style I/O Functions"> <link rel="prev" href="Table-of-Output-Conversions.html#Table-of-Output-Conversions" title="Table of Output Conversions"> <link rel="next" href="Floating_002dPoint-Conversions.html#Floating_002dPoint-Conversions" title="Floating-Point Conversions"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Integer-Conversions"></a> <p> Next: <a rel="next" accesskey="n" href="Floating_002dPoint-Conversions.html#Floating_002dPoint-Conversions">Floating-Point Conversions</a>, Previous: <a rel="previous" accesskey="p" href="Table-of-Output-Conversions.html#Table-of-Output-Conversions">Table of Output Conversions</a>, Up: <a rel="up" accesskey="u" href="C_002dStyle-I_002fO-Functions.html#C_002dStyle-I_002fO-Functions">C-Style I/O Functions</a> <hr> </div> <h4 class="subsection">14.2.8 Integer Conversions</h4> <p>This section describes the options for the ‘<samp><span class="samp">%d</span></samp>’, ‘<samp><span class="samp">%i</span></samp>’, ‘<samp><span class="samp">%o</span></samp>’, ‘<samp><span class="samp">%u</span></samp>’, ‘<samp><span class="samp">%x</span></samp>’, and ‘<samp><span class="samp">%X</span></samp>’ conversion specifications. These conversions print integers in various formats. <p>The ‘<samp><span class="samp">%d</span></samp>’ and ‘<samp><span class="samp">%i</span></samp>’ conversion specifications both print an numeric argument as a signed decimal number; while ‘<samp><span class="samp">%o</span></samp>’, ‘<samp><span class="samp">%u</span></samp>’, and ‘<samp><span class="samp">%x</span></samp>’ print the argument as an unsigned octal, decimal, or hexadecimal number (respectively). The ‘<samp><span class="samp">%X</span></samp>’ conversion specification is just like ‘<samp><span class="samp">%x</span></samp>’ except that it uses the characters ‘<samp><span class="samp">ABCDEF</span></samp>’ as digits instead of ‘<samp><span class="samp">abcdef</span></samp>’. <p>The following flags are meaningful: <dl> <dt>‘<samp><span class="samp">-</span></samp>’<dd>Left-justify the result in the field (instead of the normal right-justification). <br><dt>‘<samp><span class="samp">+</span></samp>’<dd>For the signed ‘<samp><span class="samp">%d</span></samp>’ and ‘<samp><span class="samp">%i</span></samp>’ conversions, print a plus sign if the value is positive. <br><dt>‘<samp> </samp>’<dd>For the signed ‘<samp><span class="samp">%d</span></samp>’ and ‘<samp><span class="samp">%i</span></samp>’ conversions, if the result doesn't start with a plus or minus sign, prefix it with a space character instead. Since the ‘<samp><span class="samp">+</span></samp>’ flag ensures that the result includes a sign, this flag is ignored if you supply both of them. <br><dt>‘<samp><span class="samp">#</span></samp>’<dd>For the ‘<samp><span class="samp">%o</span></samp>’ conversion, this forces the leading digit to be ‘<samp><span class="samp">0</span></samp>’, as if by increasing the precision. For ‘<samp><span class="samp">%x</span></samp>’ or ‘<samp><span class="samp">%X</span></samp>’, this prefixes a leading ‘<samp><span class="samp">0x</span></samp>’ or ‘<samp><span class="samp">0X</span></samp>’ (respectively) to the result. This doesn't do anything useful for the ‘<samp><span class="samp">%d</span></samp>’, ‘<samp><span class="samp">%i</span></samp>’, or ‘<samp><span class="samp">%u</span></samp>’ conversions. <br><dt>‘<samp><span class="samp">0</span></samp>’<dd>Pad the field with zeros instead of spaces. The zeros are placed after any indication of sign or base. This flag is ignored if the ‘<samp><span class="samp">-</span></samp>’ flag is also specified, or if a precision is specified. </dl> <p>If a precision is supplied, it specifies the minimum number of digits to appear; leading zeros are produced if necessary. If you don't specify a precision, the number is printed with as many digits as it needs. If you convert a value of zero with an explicit precision of zero, then no characters at all are produced. </body></html>