At 5:48 AM -0500 2/6/10, Chris Coggins wrote:
1. another script uses data passed into it from an html form. Some
of the fields are empty, and my "print report file" subroutine
prints the empty variables because I don't know how to filter them
out, and they need to be removed from the report. Can someone give
me the perfectly formed "if" statement that lets me skip over the
one or two empty variables during the print action? The data being
printed to the file is stored in an array. See code below.
print FILE ("Report summary: $taskarray[0] \n"); #this value is good
print FILE ("Data for task 3: $taskarray[3] \n"); #this value is good
print FILE ("Data for task 7: $taskarray[7] \n"); #this value is
empty, don't print this data
print FILE ("Data for task 2: $taskarray[2] \n"); #this value is
empty, don't print this data
print FILE ("Data for task 11: $taskarray[11] \n"); #this value is
good but needs to be modified, see #2 below
If a scalar variable is empty, i.e. is either undef or an empty
string '', it will have a false value in a logical expression.
Therefore, you can test the value of the variable and only print it
if it is true:
if( $string ) {
print "$string\n";
}
or the shorter equivalent:
print "$string\n" if $string;
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