FAQs on Advanced Fortran Programming : 012 : More on save (with demo) and optional keywords

Question 1

1. What is the purpose of the 'save' keyword in Fortran programming?

Accepted Answer

Ans. The 'save' keyword in Fortran programming is used to specify that the value of a variable should be preserved between different invocations of a subroutine or function. When a variable is defined with the 'save' attribute, its value is retained in memory even after the program execution leaves the subroutine or function.

Question 2

2. How is the 'save' keyword used in Fortran programming?

Accepted Answer

Ans. To use the 'save' keyword in Fortran programming, it should be placed before the declaration of a variable in a subroutine or function. This indicates that the variable's value should be saved between successive calls to the subroutine or function. For example, the statement 'save :: x' declares the variable 'x' with the 'save' attribute, ensuring its value is preserved across multiple invocations.

Question 3

3. Can the 'save' attribute be applied to arrays in Fortran programming?

Accepted Answer

Ans. Yes, the 'save' attribute can be applied to arrays in Fortran programming. By specifying 'save' before the declaration of an array, the values of the array elements will be preserved between different invocations of a subroutine or function. This is useful when the array needs to retain its values across multiple calls.

Question 4

4. What is the difference between 'save' and 'optional' keywords in Fortran programming?

Accepted Answer

Ans. The 'save' keyword in Fortran programming is used to preserve the value of a variable between successive calls to a subroutine or function. On the other hand, the 'optional' keyword is used to specify that a subroutine or function argument is not required to be provided by the calling program. It allows the argument to have a default value assigned if it is not explicitly provided.

Question 5

5. Can the 'save' keyword be used with optional arguments in Fortran programming?

Accepted Answer

Ans. Yes, the 'save' keyword can be used with optional arguments in Fortran programming. By applying the 'save' attribute to an optional argument, its value will be preserved between different calls to the subroutine or function. This can be useful when the optional argument needs to retain its value across multiple invocations.

Advanced Fortran Programming 012 More on save (with demo) and optional

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