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Is it a real number?
Posted on 2004-03-22
I'm looking for a number somewhere between -10000 and 10000.
if (($_ < -9999) || ($_ >9999)) {
print "\nIt's a number, but out of range\n";
} elsif ($_ >-10000) && ($_ <10000) {
print "\nPerfect\n";
} elsif ($_ is an alpha/number or just contains alpha) {
print"\nNumber expected, this contains other characters\n";
} else {print "\nShouldn't get here\n";}
I specifically need to know how to determine if $_ is a number or not.
if (($_ < -9999) || ($_ >9999)) {
print "\nIt's a number, but out of range\n";
} elsif ($_ >-10000) && ($_ <10000) {
print "\nPerfect\n";
} elsif ($_ is an alpha/number or just contains alpha) {
print"\nNumber expected, this contains other characters\n";
} else {print "\nShouldn't get here\n";}
I specifically need to know how to determine if $_ is a number or not.
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4 Comments
Very much depends on your definition of a number, but for the common case, you can use:
$var='abc';
print "$var is not a number\n" unless ($var =~ /\d+$/);
$var='abc';
print "$var is not a number\n" unless ($var =~ /\d+$/);
Active today
unless ($_ =~ /\D/) { # proceed only if it's an integer
if ($_ >= -10000 && $_ <= 10000) {
print "\nPerfect\n";
}
else {
print "\nIt's a number, but out of range\n";
}
}
if ($_ >= -10000 && $_ <= 10000) {
print "\nPerfect\n";
}
else {
print "\nIt's a number, but out of range\n";
}
}
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