Why does C need “struct” keyword and not C++?

Question

I\'ve always been a little confused about what\'s going on here:

#include 

int main() {  
    timeval tv;
    tv.tv_sec = 1;

    for (;;) {
         


        

Answer 1

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.