How to write a function which returns a structure

What is the prototype and definition of a function which returns a structure?

Same as any other kind of function which returns a value.

There's no new syntax, so try the obvious thing and see what happens.

Unless you're using some 30-year old fossil compiler, this capability has been officially part of C since 1989.

Code:

---

typedef struct
{
 int a;
} STR;

STR Func()
{
 STR str;
 
 str.a = 5;
 return(str);
}

---