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| <h4 class="subsection">12.12.3 Table of Output Conversions</h4> |
| |
| <p><a name="index-output-conversions_002c-for-_0040code_007bprintf_007d-1025"></a> |
| Here is a table summarizing what all the different conversions do: |
| |
| <dl> |
| <dt>‘<samp><span class="samp">%d</span></samp>’, ‘<samp><span class="samp">%i</span></samp>’<dd>Print an integer as a signed decimal number. See <a href="Integer-Conversions.html#Integer-Conversions">Integer Conversions</a>, for details. ‘<samp><span class="samp">%d</span></samp>’ and ‘<samp><span class="samp">%i</span></samp>’ are synonymous for |
| output, but are different when used with <code>scanf</code> for input |
| (see <a href="Table-of-Input-Conversions.html#Table-of-Input-Conversions">Table of Input Conversions</a>). |
| |
| <br><dt>‘<samp><span class="samp">%o</span></samp>’<dd>Print an integer as an unsigned octal number. See <a href="Integer-Conversions.html#Integer-Conversions">Integer Conversions</a>, for details. |
| |
| <br><dt>‘<samp><span class="samp">%u</span></samp>’<dd>Print an integer as an unsigned decimal number. See <a href="Integer-Conversions.html#Integer-Conversions">Integer Conversions</a>, for details. |
| |
| <br><dt>‘<samp><span class="samp">%x</span></samp>’, ‘<samp><span class="samp">%X</span></samp>’<dd>Print an integer as an unsigned hexadecimal number. ‘<samp><span class="samp">%x</span></samp>’ uses |
| lower-case letters and ‘<samp><span class="samp">%X</span></samp>’ uses upper-case. See <a href="Integer-Conversions.html#Integer-Conversions">Integer Conversions</a>, for details. |
| |
| <br><dt>‘<samp><span class="samp">%f</span></samp>’<dd>Print a floating-point number in normal (fixed-point) notation. |
| See <a href="Floating_002dPoint-Conversions.html#Floating_002dPoint-Conversions">Floating-Point Conversions</a>, for details. |
| |
| <br><dt>‘<samp><span class="samp">%e</span></samp>’, ‘<samp><span class="samp">%E</span></samp>’<dd>Print a floating-point number in exponential notation. ‘<samp><span class="samp">%e</span></samp>’ uses |
| lower-case letters and ‘<samp><span class="samp">%E</span></samp>’ uses upper-case. See <a href="Floating_002dPoint-Conversions.html#Floating_002dPoint-Conversions">Floating-Point Conversions</a>, for details. |
| |
| <br><dt>‘<samp><span class="samp">%g</span></samp>’, ‘<samp><span class="samp">%G</span></samp>’<dd>Print a floating-point number in either normal or exponential notation, |
| whichever is more appropriate for its magnitude. ‘<samp><span class="samp">%g</span></samp>’ uses |
| lower-case letters and ‘<samp><span class="samp">%G</span></samp>’ uses upper-case. See <a href="Floating_002dPoint-Conversions.html#Floating_002dPoint-Conversions">Floating-Point Conversions</a>, for details. |
| |
| <br><dt>‘<samp><span class="samp">%a</span></samp>’, ‘<samp><span class="samp">%A</span></samp>’<dd>Print a floating-point number in a hexadecimal fractional notation which |
| the exponent to base 2 represented in decimal digits. ‘<samp><span class="samp">%a</span></samp>’ uses |
| lower-case letters and ‘<samp><span class="samp">%A</span></samp>’ uses upper-case. See <a href="Floating_002dPoint-Conversions.html#Floating_002dPoint-Conversions">Floating-Point Conversions</a>, for details. |
| |
| <br><dt>‘<samp><span class="samp">%c</span></samp>’<dd>Print a single character. See <a href="Other-Output-Conversions.html#Other-Output-Conversions">Other Output Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%C</span></samp>’<dd>This is an alias for ‘<samp><span class="samp">%lc</span></samp>’ which is supported for compatibility |
| with the Unix standard. |
| |
| <br><dt>‘<samp><span class="samp">%s</span></samp>’<dd>Print a string. See <a href="Other-Output-Conversions.html#Other-Output-Conversions">Other Output Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%S</span></samp>’<dd>This is an alias for ‘<samp><span class="samp">%ls</span></samp>’ which is supported for compatibility |
| with the Unix standard. |
| |
| <br><dt>‘<samp><span class="samp">%p</span></samp>’<dd>Print the value of a pointer. See <a href="Other-Output-Conversions.html#Other-Output-Conversions">Other Output Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%n</span></samp>’<dd>Get the number of characters printed so far. See <a href="Other-Output-Conversions.html#Other-Output-Conversions">Other Output Conversions</a>. |
| Note that this conversion specification never produces any output. |
| |
| <br><dt>‘<samp><span class="samp">%m</span></samp>’<dd>Print the string corresponding to the value of <code>errno</code>. |
| (This is a GNU extension.) |
| See <a href="Other-Output-Conversions.html#Other-Output-Conversions">Other Output Conversions</a>. |
| |
| <br><dt>‘<samp><span class="samp">%%</span></samp>’<dd>Print a literal ‘<samp><span class="samp">%</span></samp>’ character. See <a href="Other-Output-Conversions.html#Other-Output-Conversions">Other Output Conversions</a>. |
| </dl> |
| |
| <p>If the syntax of a conversion specification is invalid, unpredictable |
| things will happen, so don't do this. If there aren't enough function |
| arguments provided to supply values for all the conversion |
| specifications in the template string, or if the arguments are not of |
| the correct types, the results are unpredictable. If you supply more |
| arguments than conversion specifications, the extra argument values are |
| simply ignored; this is sometimes useful. |
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