Exam (elaborations)
• FORTRAN GOOD PROGRAMMING TIPS
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• FORTRAN GOOD PROGRAMMING TIPS...
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• FORTRAN GOOD PROGRAMMING TIPSWhat should your stop statement do? - ANSWER Terminates the
program and returns a code of 0.
Done via the stop 0 command
What is one way of checking if your program ran successfully? -
ANSWER using the echo $? on command line. See if it prints out the
value next to your stop statement
What statement must all your programs have? - ANSWER implicit none
Your variable names should - ANSWER be very descriptive
What should be included in your declaration section for more clarity with
user? - ANSWER Variable dictionary that provides the name of the
variable, and its units
What is critical when naming variables? - ANSWER Variables MUST
have a value assigned to them before they can be used in an expression
What errors occur when you fail to assign a value to a value and use it in
an expression? - ANSWER Execution-time error or run-time error
Say a program you want to write has a constant (g = 9.81 m/s^2), how
would you use this in the program? - ANSWER Make g a parameter
that cannot change value. Done via the statement
real, parameter :: G = 9.81
Make your parameters uppercase to make them visually apparent
What are binary operators? - ANSWER They require two "operands" or
two inputs to work
, + (addition), - (subtraction), * (multiplication), / (division)
Unary Operators - ANSWER require only one operand. Includes only
the + and - operators to assign signs to numbers
Arithmetic Operator Rules - ANSWER 1) No two operators may occur
sequentially
2) Negative values cannot be exponentiated to a non-integer power or a
negative power
3) Division by zero is not permissible
a*-b - ANSWER illegala
a*(-b) - ANSWER legal
a**-2 - ANSWER illegal
a**(-2) - ANSWER legal
(-1.0)**2 - ANSWER legal
(-1.0)**2.0 - ANSWER illegal
(-1.0)**2.1 - ANSWER illegal (NaN)
(3.14)**0.5 - ANSWER legal
1.0/0.0 - ANSWER Illegal
2/0 - ANSWER Illegal
Use Parenthesis to - ANSWER Control the order of operations in an
expression
2**5-2 - ANSWER 30
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