A void pointer in c is called a generic pointer, it has no associated data type. - AticleWorld, Implementation of memmove in c language - AticleWorld, How to use and Implement own memset in C - AticleWorld, How to use and Implement own strcat in C - AticleWorld, How to use and Implement own strcmp in C - AticleWorld, How to use and Implement own memcmp in C - AticleWorld, Difference between ++*p, *p++ and *++p - AticleWorld, Implementation of memcpy in c language - AticleWorld, How to use and Implement own strncmp in C - AticleWorld, How to use and Implement own strncat in C - AticleWorld, What is a Null Pointer in C/C++? About the conditional operator: do you mean this instead?
Bear in mind that the internal representation of floating pointer numbers is not standardized in C++. So to access the value of integer variable (iData) through the void pointer we have to typecast void pointer through the integer pointer. // or right by a non-zero exponent. // Mask out the 8 least signinficant digits of the number, // exp should be >= 127 by now, since we handled the cases of a negative exp, // already by testing if -1 < f < 1. C doesn't have namespaces, so it defines everything globally. No. `printValue` wants a pointer, `nValue` is an `int`. > About the conditional operator: do you mean this instead? The, We know that void pointer can be converted to another data type that is the reason. Just make sure there isn’t a better (safer) way to do the same thing using other language mechanisms first! ... why it's not 5 ? Similarly we can assign address of any data type to the void pointer. I am not sure what item is in your problem. // typecasted to any type like int *, char *, .. Why is an empty else-if statement bad style, and how should I rewrite it? You cannot apply the indirection operator to a pointer of type void*. So, in your specific situation, we have: (adsbygoogle=window.adsbygoogle||[]).push({}); In the previous program, in place of constructing 3 types of pointers, we can create a single pointer variable that can access & manipulate any kind of variable properly, i.e. The void pointer, also known as the generic pointer, is a special type of pointer that can be pointed at objects of any data type! Only my understanding of what you want to do. When you cast the `void*` to an `int*`, the data is unchanged. For example, the following would be valid: But who knows what the result would actually be! In the above code void pointer, pvData is pointing to the address of iData (integer variable). What is difference between memmove and memcpy (memmove vs memcpy)? I'm experiencing the same syntax highlighting behavior in Visual Studio Code. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. I have working experience of different microcontrollers (stm32, LPC, PIC AVR and 8051), drivers (USB and virtual com-port), POS device (VeriFone) and payment gateway (global and first data). We don't want to read the value from the pointer at that point. void *ptr is a void pointer. Since you're not storing addresses in @truc, you don't need it. Typo = The next obvious questions is: Earth was suddenly teleported away from the sun, can we recover? 1) There's rarely a need to actually do so (unless maybe you're doing your own memory management) Although the above function seems like a neat way to make a single function handle multiple data types, C++ actually offers a much better way to do the same thing (via function overloading) that retains type checking to help prevent misuse.
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