171 lines
4.1 KiB
HTML
171 lines
4.1 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<title>printf - Write formatted output</title>
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<h2>printf - Write formatted output</h2>
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<strong>Synopsis</strong>
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<p><strong>printf</strong> <em>format</em> [ <em>argument</em> ...
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]</p>
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<p><strong>Description</strong></p>
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<p>You can use <strong>printf</strong> to format and display output
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on standard output. The syntax is similar to the ILE C printf()
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function. <strong>printf</strong> formats using the following
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conversion control string syntax:</p>
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<p>
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%[<em>flags</em>][<em>width</em>].[<em>precision</em>]<em>conversion</em></p>
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<p><em>conversion</em> specifies how the corresponding <em>
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argument</em> is displayed. You must specify one of the following
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conversion characters:</p>
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<dl>
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<dt><strong>c</strong></dt>
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<dd>Unsigned character.</dd>
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<dt><strong>d</strong></dt>
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<dd>Signed decimal number.</dd>
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<dt><strong>e,E</strong></dt>
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<dd>Scientific notation.</dd>
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<dt><strong>f</strong></dt>
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<dd>Floating point number.</dd>
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<dt><strong>g,G</strong></dt>
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<dd>Scientific notation with significant digits.</dd>
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<dt><strong>i</strong></dt>
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<dd>Signed decimal number.</dd>
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<dt><strong>o</strong></dt>
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<dd>Unsigned octal number.</dd>
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<dt><strong>s</strong></dt>
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<dd>String.</dd>
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<dt><strong>u</strong></dt>
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<dd>Unsigned decimal number.</dd>
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<dt><strong>x</strong></dt>
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<dd>Unsigned hexadecimal number with digits 0123456789abcdef.</dd>
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<dt><strong>X</strong></dt>
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<dd>Unsigned hexadecimal number with digits 0123456789ABCDEF.</dd>
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</dl>
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<p><em>flags</em> control how the <em>argument</em> is displayed in
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the following ways:</p>
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<dl>
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<dt><strong>-</strong> (minus)</dt>
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<dd>Left align <em>argument</em> within the field.</dd>
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<dt><strong>+</strong> (plus)</dt>
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<dd>Prefix all numbers with a + or -.</dd>
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<dt><strong>space</strong></dt>
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<dd>Prefix positive numbers with <space> and negative numbers
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with -.</dd>
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<dt><strong>0</strong></dt>
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<dd>Pad field width with leading zeros for <strong>d, e, E, f,
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g</strong>, or <strong>G</strong>.</dd>
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<dt><strong>#</strong></dt>
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<dd>Use an alternate output form depending on conversion character.
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For <strong>o</strong>, prefix octal numbers with "0". For <strong>
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x</strong>, prefix hexadecimal numbers with "0x". For <strong>
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X</strong>, prefix hexadecimal numbers with "0X". For <strong>e, E,
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f, g</strong>, or <strong>G</strong>, display decimal point. For
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<strong>g</strong> or <strong>G</strong>, display trailing
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zeros.</dd>
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</dl>
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<p><em>width</em> is the minimum number of character positions
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displayed. Using an asterisk (*) character for the width means the
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value of the next <em>argument</em> is the field width.</p>
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<p>The meaning of <em>precision</em> depends on the conversion
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character.</p>
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<ul>
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<li>For <strong>d, i, o, u, x</strong>, or <strong>X</strong> <em>
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precision</em> specifies the minimum number of digits to be
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displayed.</li>
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<li>For <strong>e, E</strong>, or <strong>f</strong> <em>
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precision</em> specifies the number of digits to be displayed after
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the decimal point.</li>
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<li>For <strong>g</strong>, or <strong>G</strong> <em>
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precision</em> specifies the maximum number of significant
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digits.</li>
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<li>For <strong>s</strong> <em>precision</em> specifies the maximum
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number of characters to be displayed.</li>
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</ul>
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<p><strong>Options</strong></p>
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<p>None.</p>
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<p><strong>Operands</strong></p>
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<p>Each <em>argument</em> is converted and displayed as specified
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by the <em>format</em>.</p>
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<p><strong>Exit Status</strong></p>
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<ul>
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<li>0 when successful.</li>
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<li>>0 when unsuccessful.</li>
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</ul>
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<p><strong>Related information</strong></p>
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<ul>
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<li><a href="dspmsg.htm">dspmsg - Display message from message
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catalog</a></li>
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<li><a href="echo.htm">echo - Write arguments to standard
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output</a></li>
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<li><a href="print.htm">print - Write output</a></li>
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</ul>
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</body>
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</html>
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