String compare in Perl with eq vs

Question

I am  a complete Perl newbie  doing string compare in an if statement   If I do following   if   str1     taste   amp  amp   str2     waste         I see the correct result  i e  if the condition matches  it evaluates the  then  block   But I see these warnings      Argument  taste  isn t numeric in numeric eq      at line number x     Argument  waste  isn t numeric in numeric eq      at line number x    But if I do   if   str1 eq  taste   amp  amp   str2 eq  waste         Even if the if condition is satisfied  it doesn t evaluate the  then  block   Here   str1 is taste and  str2 is waste   How should I fix this

User · Answer

Maybe the condition you are using is incorrect:

$str1 == "taste" && $str2 == "waste"

The program will enter into THEN part only when both of the stated conditions are true.

You can try with $str1 == "taste" || $str2 == "waste". This will execute the THEN part if anyone of the above conditions are true.

User · Answer

First  eq is for comparing strings     is for comparing numbers      Even if the  if  condition is satisfied  it doesn t evaluate the  then  block    I think your problem is that your variables don t contain what you think they do  I think your  str1 or  str2 contains something like  taste n  or so  Check them by printing before your if  print  str1   str1  n     The trailing newline can be removed with the chomp  str1   function

User · Answer

does a numeric comparison  it converts both arguments to a number and then compares them   As long as  str1 and  str2 both evaluate to 0 as numbers  the condition will be satisfied   eq does a string comparison  the two arguments must match lexically  case-sensitive  for the condition to be satisfied    foo      bar       True  both strings evaluate to 0   foo  eq  bar       False  the strings are not equivalent   Foo  eq  foo       False  the F characters are different cases   foo  eq  foo       True  both strings match exactly

User · Answer

Did you try to chomp the  str1 and  str2   I found a similar issue with using  another   str1 eq  Y  and it only went away when I first did   chomp  str1   if   str1 eq  Y              works after that    Hope that helps

[string] String compare in Perl with "eq" vs "=="

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