Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I was trying to look through some very old FORTRAN code and came across the following statement:
IF (XKJ.GT.ACCY) THEN
I looked through the entire code and didn’t find a declaration for ‘ACCY‘. I am assuming it is a built-in variable/constant/function, but wasn’t able to find the definition. I ‘googled’ it and came across other FORTRAN samples with similar expressions (but no definition of ACCY).
It’s been 20 years since I have looked at FORTRAN code. Anyone have any idea what ‘ACCY‘ is?
It’s undoubtedly a variable holding an “accuracy” used to measure floating point computations — which can drift due to the inexact representation of some floating point numbers. In Fortran variables don’t have to be declared unless you use a compiler option (or IMPLICIT statement) to turn this feature on. Variables that start with A-H and O-Z are automatically consider REAL variables (I-N are integers). The compiler in question may or may not zero out the memory for the variable so unless it’s assigned somewhere — typically a COMMON block — it may be zero or some arbitrary value.