Computer Number Representation Binary Form o All numbers are stored in memory in binary form. Word length is the number of bits used to store a number. expressed in bytes. 1 byte =1 B=8 bits A typical printed page required ~3kB Using 64 bits integers in the range 1-203~1019 (the sian represented by the first bit) The ratio of the size of the universe to the size of a proton~ 1041 1口“4元，4元↑重QC Weihua Gu (Shanghai Jiao Tong University) Computational Physics Chapter 1 14/0920155/103Computer Number Representation Binary Form All numbers are stored in memory in binary form. Word length is the number of bits used to store a number, expressed in bytes. 1 byte ≡ 1 B = 8 bits A typical printed page required ∼3kB. Using 64 bits ⇒ integers in the range 1 − 2 63 ∼ 1019 (the sign represented by the first bit). The ratio of the size of the universe to the size of a proton ∼ 1041 . Weihua Gu (Shanghai Jiao Tong University) Computational Physics Chapter 1 14/09/2015 5 / 103