Why void is not used in main in C++?

The reason not to use void main() is that the language standard doesn’t permit it, any more than it permits double main(long long foo, time_t bar) .

Does C have a void return type?

In C and C++ A function with void result type ends either by reaching the end of the function or by executing a return statement with no returned value. The void type may also appear as the sole argument of a function prototype to indicate that the function takes no arguments.

Can I use void main in C?

The void main() indicates that the main() function will not return any value, but the int main() indicates that the main() can return integer type data. When our program is simple, and it is not going to terminate before reaching the last line of the code, or the code is error free, then we can use the void main().

Why can’t I use void main?

If you write the whole error-free main() function without a return statement at the end then the compiler automatically adds a return statement with proper datatype at the end of the program. To summarize the above, it is never a good idea to use void main() or simply, main() as it doesn’t confirm standards.

Does C++ allow main function to have return type void?

C++ allows main function to have return type void No, it doesn’t. The C++ standard only requires 2 different types of main signatures. Others may be optionally added if the return type is int. Implementations of C++ which allow void return types are incorrect in terms of the C++ standard.

What is the __counter__ extension in Clang?

Clang-specific extension that functions similar to __FILE__ but only renders the last path component (the filename) instead of an invocation dependent full path to that file. Defined to an integer value that starts at zero and is incremented each time the __COUNTER__ macro is expanded.

Is it legal to not return from a function in C++?

It is legal under C/C++ to not return from a function that claims to return something. There are a number of use cases, such as calling exit (-1), or a function that calls it or throws an exception. The compiler is not going to reject legal C++ even if it leads to UB if you are asking it not to.

What is the clang matrix type extension?

Clang provides an extension for matrix types, which is currently being implemented. See the draft specification for more details. For example, the code below uses the matrix types extension to multiply two 4×4 float matrices and add the result to a third 4×4 matrix. The matrix type extension also supports operations on a matrix and a scalar.