legal and illegal references

references

int i = 1024, i2 = 2048; 	  // i and i2 are both ints
int &r = i, r2 = i2;	 	    // r is a reference bound to i; r2 is an int
int i3 = 1024, &ri = i3;  	// i3 is and int; ri i a reference bound to i3
int &r3 = i3, &r4 = i2;		  // both r3 and r4 are references


int &refVal4 = 10;			    // error: initializer must be an object
double dval = 3.14;
int &refVal4 = dval;		    // error: initiazlier must be an int object

double dval2 = 4.5345;		
double &refVakD = dval2;	  // a reference may be bound to an object of same type