This script will show how to read numbers from keyboard and find the sum.If some value is entered say 999 then it will exit the program.
#!/usr/bin/perl
print "Enter the number \n";
$userinput = <STDIN>;
chomp ($userinput);
print "User typed $userinput\n";
while ($userinput != 999) {
$sum=$sum+$userinput;
print "The SUM is $sum\n";
print "Enter the number again \n";
$userinput = <STDIN>;
chomp ($userinput);
}
print "Typed 999, So exiting\n";
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