Menu
I've always been a little confused about what's going on here:
#include <stdio.h> int main() { timeval tv; tv.tv_sec = 1; for (;;) { select(0, 0, 0, 0, &tv); printf("%s\n", "Hello World!"); } } Sorry if that doesn't compile, just wrote it as a quick example.
Code like this won't compile under gcc unless I add the keyword struct prior to the use of the struct timeval. g++ on the other hand handles it fine as is.
Is this a difference between how C and C++ handle structures or is it just a difference in the compilers? (I'm very C++ oriented, and the use of struct in C on lines like this has always somewhat baffled me).
222
Structures (also called structs) are a way to group several related variables into one place. Each variable in the structure is known as a member of the structure. Unlike an array, a structure can contain many different data types (int, float, char, etc.).
Basically struct is used to define a structure. But when we want to use it we have to use the struct keyword in C. If we use the typedef keyword, then a new name, we can use the struct by that name, without writing the struct keyword.
In C programming, a struct (or structure) is a collection of variables (can be of different types) under a single name.
yes but the compiler-driver decides to which libraries the code will be linked.
Syntactically both treat struct almost the same. Only C++ has added an extra rule that allows to omit the struct (and class) keyword if there is no ambiguity.
If there is ambiguity, also C++ requires the struct keyword in some places. A notorious example is stat on POSIX systems where there is a struct stat and a function stat.
58
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
