Can we use function on left side of an expression in C and C++?

In C, it might not be possible to have function names on left side of an expression, but it’s possible in C++.

#include<iostream> 
  
using namespace std; 
  
/* such a function will not be safe if x is non static variable of it */
int &fun() 
{ 
   static int x;  
   return x; 
}     
  
int main() 
{ 
   fun() = 10; 
  
   /* this line prints 10 on screen */
   printf(" %d ", fun()); 
  
   getchar(); 
   return 0; 
} 

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