What is the difference between typedef and define which is better

Active Oldest Votes. Improve this answer. Andreas Grech Andreas Grech k 98 98 gold badges silver badges bronze badges. After the typedef stdfx , valid objects of that type are pointers to functions that receive an int and do not return a value. Why would the define fail in casec of function pointer as argument?

No, they are not the same. John Bode John Bode k 17 17 gold badges silver badges bronze badges. Now saying that, here are a few differences: With define you can define constants that can be used in compile time. Yochai Timmer Yochai Timmer It means before compilation, preprocessor will find all macros and replace them with their original syntax — Prince Vijay Pratap. I'm just curious about that. For example, define defType int typedef int tdType defType x; tdType y; Here, the compiler sees variable x as an int, but variable y as a data type called 'tdType' that happens to be the same size as an int.

The usage of the term "pointer" could lead to some confusion here. That's why I went back and added a link to typdef on MSDN - just in case anyone in the future will use this question to find what typedef is. But maybe I should change that word Chris Tang 7 7 silver badges 14 14 bronze badges. In comparison. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end.

Typedef VS define in C Typedef In the C programming language , a keyword called typedef can be used to give a type a new name. The of three numbers n1 , n2 , and n3 is : BYTE b1, b2;. BYTE b1 , b2 ;. Book book ;. The title of the book is : C programming. The book of the book is : Dennis Ritchie. The subject of the study is : Tutorials and examples.

The degree of encapsulation between typedef and define is different. Typedef can be regarded as a kind of complete "encapsulation" type, that is to say, after the typedef is declared, no more things can be added to it. But define is not the case, it is just text replacement work, so it can still be encapsulated after declaration. Summarize the initialization problem when using the const keyword to define constants in non-classes, and test VS By the way, record the difference between define macro and typedef.

Explanation of the code, In the above code, both created types have the same name and they declare in the same scope. So when we will compile the code, we will get the compiler error. In another case when we used CharPtr to declare the variable then Data3 and Data4 both become character pointer.

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