A: The encoded identifiers used for the functions:
	
	00000000004004b4 T _Z7averagePdRd
	00000000004004e2 T _Z7averageif
	000000000040050a T main

B: Output:1 8
          4 8
		  4 8
		  8 8

  reason:size of char = 1 byte
		 size of int = 4 byte
		 size of double = 4 btye
		 size of float = 8 byte

  No matter what char,int,double,float sizes are, their pointer type are the same.
  In a 32bit system, it size is 4 bytes, while in a 64bit system, it size is 8 byte.