How to detect NULL input?

Is there a way to determine if the return key is pressed while waiting
for input? I tried to do something like the code below in the line "if
(LLT(str1,'')) then" where I was comparing "str1" to ''. The program
didn't read the enter key...

function evaluateinput(str1) result(string)
implicit none
character(12) str1
character(12) string
if (LLT(str1,'')) then
string = 'less than'
else if (LGT(str1,'')) then
string = 'greater than'
else
string = 'equal'
end if
return
end

.

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