How to check and comapre content of two structures

[harisrinu]

How can we check whether the contents of two structure variables are same or not?

What is the difference between an enumeration and a set of pre-processor # defines?

What is the maximum combined length of command line arguments including the space between adjacent arguments?

[Banfa]

How can we check whether the contents of two structure variables are same or not?

You compare all the members of the structures. If you try to use something like the memcmp function you will run into trouble because the could be padding in the structure and although the members are the same the structure padding could contain different values effects the comparison result.

If you are using C++ overload operator = for the structure to do a comparison for you allowing you to use == in you code.

What is the difference between an enumeration and a set of pre-processor # defines?

What do you think the differences are?

What is the maximum combined length of command line arguments including the space between adjacent arguments?

It is platform dependent.

[weaknessforcats]

If you are using C++ overload operator = for the structure to do a comparison

Typo. He means you should overload operator==.

[kreagan]

What is the difference between an enumeration and a set of pre-processor # defines?

pre-processor = string substitution during compile time.
enumeration = counting. (I would suggest reading more about enumeration).

[weaknessforcats]

pre-processor = string substitution during compile time.
enumeration = counting. (I would suggest reading more about enumeration).

Close.

preprocessor -> substitution before the compile starts. Compiler cannot check validity of the expansion.

enumeration -> named integer values. It's a bigger area then just counting. enums are part of C/C++ and the compiler can check for correct usage and value.