How to know whether a key exists or not in perl?

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What does length(%HASH) produce if you have thirty-seven random keys in a newly created hash?

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Packing and Unpacking. Hi, I want to get output as 0x23400000345.... in the below example How to get? i tried out, but unable to get the answer $r=0x234; $t=0x345; $y=pack('L L',$t,$r); $x1=unpack('L!',pack('P',$y)); printf("\nThe value is $x1"); I didn't get constant output

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Which guidelines by Perl modules must be followed?

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What are the logical operators used for small scale operations?

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What is perl pop array function?

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I have one question regarding to eval function. I know eval function is use for error checking but I am not able to understand below line. eval \'exec perl -S $0 ${1+\"$@\"}\' if 0; $0 for script name $@ set if error occur

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How to count no of occurrence of a unique patterns in perl?

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Explain lists and ivalue?

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What is use of ‘->’ symbol?

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You want to open and read data files with perl. How would you do that?

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Explain the default scope of variables in perl?

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