// Not executable.
// Examples of lvalues and rvalues

// some variables and declarations
int x, z;
int* y = 0x1;
int* get_pointer();
int get_integer(); 

// lvalue examples (see left side of =)
// lvalue is evaluated to an address
x = 1;
*y = 1;
*(get_pointer()) = 1;
y[4] = 1;
*(y+4) = 1

// rvalue examples (see right side =)
// rvalue is evaluated to a value
x = 1;
x = z;
x = *y;
x = get_integer();
y = 0x2;
int g = *(y+4);

// invalid lvalues
*4 = 1;  // error: * cannot be used on int

// invalid conversions from lvalue
int* h = &10;  // error: lvalue required for & operand