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# convert number to format

Posted on 2003-12-09
428 Views
Hello

I need to convert numbers like .7 and 2.3 to 00001 and 00011 respectivly.

examples
0.7 is to be rounded to 1 which is to be 00001
2.3 is to be rounded to 2 which is to be 00011
4.5 is to be rounded to 5 which is to be 11111

so here is my best shut
my \$results = flt2bit5 ( .7);

sub flt2bit5 {
my \$n = shift;
my \$n = sprintf ("%.0f", \$n);
´
I am not sure ....

thanks
0
Question by:samj
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LVL 5

Accepted Solution

arjanh earned 50 total points
ID: 9906803
This does the trick:

sub flt2bit5 {
my \$n = shift;
my \$res;
for( my \$i=5-int(\$n+0.5); \$i>0; \$i-- ) {
\$res .= "0";
}
for( \$i=0; \$i<int(\$n+0.5); \$i++ ) {
\$res .= "1";
}
return \$res;
}

int() is basically a floor() function, so by adding 0.5 you get an actual round(). You have to fill with 0 for 5-n digits and then print n times 1.
0

LVL 3

Expert Comment

ID: 9907259
You could also use the string mulitplication operator..

sub flt2bit5 {
my (\$n) = @_;
\$n = int (\$n + 0.5);
\$n = 5 if (\$n > 5);  # Just in case
\$n = 0 if (\$n < 0);  # Just in case
return "0" x (5 - \$n) . "1" x \$n;
}
0

LVL 2

Expert Comment

ID: 9907305
2.3 is to be rounded to 2 which is to be 00011

That should be 00010

0

LVL 28

Expert Comment

ID: 9907550
If you're tring to convert to binary, then this will work.

use strict;

my @num = qw(0.7 2.3 4.5);

foreach (@num) {
my \$results = flt2bit5(\$_);
print "\$_ is to be rounded to ".sprintf ("%.0f", \$_)." which is to be \$results\n";
}

sub flt2bit5 {
my \$n = sprintf ("%.0f", shift);
return sprintf ("%.5b", \$n);
}
0

LVL 28

Expert Comment

ID: 9907602
If you want the output to be as you posted, then change the return statement to this:

return sprintf ("%0.5d", 1 x \$n);
0

Author Comment

ID: 9908838
thanks for to all for all the comments, arjanh had the fastest code when I benchmarked them.

thanks again
0

LVL 3

Expert Comment

ID: 9908859
FishMonger has it.  You won't even need the function call, just change it to:

my \$results = spirntf("%0.5d", "1" x (\$input + 0.5));

If inputut is less than 0, you will still get "00000", but if \$input is > 5, you will get a field more than 5 characters.  Even the error checking can be done in one line...

my \$results = sprintf("%0.5d", "1" x ((\$input > 4.5) ? 5 : \$input + 0.5));
0

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