//generalized lvalues
foo() {
      int a,b,f;
     (a, b) += 5;               					// lvalue required as left operand of assignment            
     a, (b += 5);					
     &(a, b);										// lvalue required as unary ‘&’ operand
     a, &b;
     (a ? b : c) = 5 ; 								// ‘c’ undeclared (first use in this function)
     (a ? b = 5 : (c = 5)) ;

     (int)a = 5 ; 									// lvalue required as left operand of assignment
     (int)(a = (char *)(int)5) ;

     (int)a += 5;									// lvalue required as left operand of assignment
     (int)(a = (char *)(int) ((int)a + 5));

    (int)f = 1;										// lvalue required as left operand of assignment
    (int *)&f;
}