C function defined as int but having no return statement in the body still compiles

Question

Say you have a C code like this:

#include 

int main(){
    printf("Hello, world!\\n");
    printf("%d\\n", f());    
}

in         


        

Answer 1

The default return value from a function is int. In other words, unless explicitly specified the default return value by compiler would be integer value from function.

So, the ommiting of return statement is allowed, but undefined value will be returned, if you try to use it.