C Programming - Functions - Discussion

But everytime you declare function you have to specify that it is void, int or float.

How it can be int ?

Please specify a code in which there is a function called with no return type.

The given answer (i.e., True) corresponds to the pre C99 era. It is no longer valid.

Can I declare function float yes/no?

Yes you can declare.

The int is the main () function's return type. That means that the kind of value main () can return is an integer.

Void main () is not a standard form, some compilers allow this, but none of the standards have ever listed it as an option. Therefore, compilers don't have to accept this form and several don't. Again, stick to the standard form, and you won't run into problems if you move a program from one compiler to another.

The default return type is void.

The default return type is int.

OS will collect the default integer value that is 0.
According to me, that is programmer choice, but compiler default will return an integer.

In C the default return type is void. It's int in C++.