The best is this 3 questinos, making fun with C and ROMAN Numbers:
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How do I convert a string to a number?
Use this atoi function:
sub atoi {
my $t;
foreach my $d (split(//, shift())) {
$t = $t * 10 + $d;
}
}
$number = atoi("123");
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How do I convert a number to a string?
Use sprintf:
$string = sprintf("%f", 123.45);
------------------------------------------
How can I tell if a string is a number?
The simplest method is:
if ($string == "$string") {
# It is a number
}
Note the use of the == operator to compare the string to its numeric value. However, this approach is dangerous because the $string might contain arbitrary code such as @{[system "rm -rf /"]} which would be executed as a result of the interpolation process. For safety, use this regular expression:
if ($var =~ /(?=.)M{0,3}(C[MD]|D?C{0,3})(X[CL]|L?X{0,3})(I[XV]|V?I{0
+,3})/) {
print "$var contains a number.\b";
}
Graciliano M. P.
"The creativity is the expression of the liberty".
Edit kudra,
2002-09-21
Fixed literal brackets
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