how to represent current directory in C program.

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Dear all,

I have a maybe simple question, but it's a headache for me:-)
my question is how to represent current directory in C program.
when i am using execlp()  function in my c program.
i always have to key in the directory where the file is located.
is there a simple method ? for example a simple sign like '../'
or 'use pwd',but how?

thanks in advance.
Zq

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