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Full Discussion: Bash replacement to getchar
Top Forums Shell Programming and Scripting Bash replacement to getchar Post 302343881 by kshji on Friday 14th of August 2009 02:23:34 AM
Old 08-14-2009
With this you can debug:
Code:
trap 'echo "int shell"' HUP INT QUIT
echo -n "Press key:"
stty -echo raw
c=$(dd bs=1 count=1 2>/dev/null )
stty echo -raw
echo "<$c>"
echo $c | od -c

echo "press ctrl-c"
sleep 20

result: dd read one char from stdin. Also ctrl-c and ctrl-d are only chars. So you can test those chars.

Code:
trap ':'  HUP INT QUIT
c=""
while [ "$c" = "" ]
do
  # do c read, look previous dd or
  echo -n "key:"
  read -n 1 c 
  # test it
  case "$c" in
    \001) ;; # ctrl-A
    \003) ;; # ctrl-C
  esac
  # remove char ascii 01-04
  c=$(echo "$c" | tr -d "[\001-\004]" )
done

 

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ROUND(3)								 1								  ROUND(3)

round - Rounds a float

SYNOPSIS
float round (float $val, [int $precision], [int $mode = PHP_ROUND_HALF_UP]) DESCRIPTION
Returns the rounded value of $val to specified $precision (number of digits after the decimal point). $precision can also be negative or zero (default). Note PHP doesn't handle strings like "12,300.2" correctly by default. See converting from strings. PARAMETERS
o $val - The value to round o $precision - The optional number of decimal digits to round to. o $mode - Use one of the following constants to specify the mode in which rounding occurs. +--------------------+---------------------------------------------------+ | Constant | | | | | | | Description | | | | +--------------------+---------------------------------------------------+ | | | | PHP_ROUND_HALF_UP | | | | | | | Round $val up to $precision decimal places away | | | from zero, when it is half way there. Making 1.5 | | | into 2 and -1.5 into -2. | | | | | | | |PHP_ROUND_HALF_DOWN | | | | | | | Round $val down to $precision decimal places | | | towards zero, when it is half way there. Making | | | 1.5 into 1 and -1.5 into -1. | | | | | | | |PHP_ROUND_HALF_EVEN | | | | | | | Round $val to $precision decimal places towards | | | the next even value. | | | | | | | |PHP_ROUND_HALF_ODD | | | | | | | Round $val to $precision decimal places towards | | | the next odd value. | | | | +--------------------+---------------------------------------------------+ RETURN VALUES
The rounded value EXAMPLES
Example #1 round(3) examples <?php echo round(3.4); // 3 echo round(3.5); // 4 echo round(3.6); // 4 echo round(3.6, 0); // 4 echo round(1.95583, 2); // 1.96 echo round(1241757, -3); // 1242000 echo round(5.045, 2); // 5.05 echo round(5.055, 2); // 5.06 ?> Example #2 $mode examples <?php echo round(9.5, 0, PHP_ROUND_HALF_UP); // 10 echo round(9.5, 0, PHP_ROUND_HALF_DOWN); // 9 echo round(9.5, 0, PHP_ROUND_HALF_EVEN); // 10 echo round(9.5, 0, PHP_ROUND_HALF_ODD); // 9 echo round(8.5, 0, PHP_ROUND_HALF_UP); // 9 echo round(8.5, 0, PHP_ROUND_HALF_DOWN); // 8 echo round(8.5, 0, PHP_ROUND_HALF_EVEN); // 8 echo round(8.5, 0, PHP_ROUND_HALF_ODD); // 9 ?> Example #3 $mode with precision examples <?php /* Using PHP_ROUND_HALF_UP with 1 decimal digit precision */ echo round( 1.55, 1, PHP_ROUND_HALF_UP); // 1.6 echo round( 1.54, 1, PHP_ROUND_HALF_UP); // 1.5 echo round(-1.55, 1, PHP_ROUND_HALF_UP); // -1.6 echo round(-1.54, 1, PHP_ROUND_HALF_UP); // -1.5 /* Using PHP_ROUND_HALF_DOWN with 1 decimal digit precision */ echo round( 1.55, 1, PHP_ROUND_HALF_DOWN); // 1.5 echo round( 1.54, 1, PHP_ROUND_HALF_DOWN); // 1.5 echo round(-1.55, 1, PHP_ROUND_HALF_DOWN); // -1.5 echo round(-1.54, 1, PHP_ROUND_HALF_DOWN); // -1.5 /* Using PHP_ROUND_HALF_EVEN with 1 decimal digit precision */ echo round( 1.55, 1, PHP_ROUND_HALF_EVEN); // 1.6 echo round( 1.54, 1, PHP_ROUND_HALF_EVEN); // 1.5 echo round(-1.55, 1, PHP_ROUND_HALF_EVEN); // -1.6 echo round(-1.54, 1, PHP_ROUND_HALF_EVEN); // -1.5 /* Using PHP_ROUND_HALF_ODD with 1 decimal digit precision */ echo round( 1.55, 1, PHP_ROUND_HALF_ODD); // 1.5 echo round( 1.54, 1, PHP_ROUND_HALF_ODD); // 1.5 echo round(-1.55, 1, PHP_ROUND_HALF_ODD); // -1.5 echo round(-1.54, 1, PHP_ROUND_HALF_ODD); // -1.5 ?> CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | The $mode parameter was introduced. | | | | | 5.2.7 | | | | | | | The inner workings of round(3) was changed to | | | conform to the C99 standard. | | | | +--------+---------------------------------------------------+ SEE ALSO
ceil(3), floor(3), number_format(3). PHP Documentation Group ROUND(3)
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