All information in the computer is expressed in the form of () code.

Inside the computer, all data are represented in the form of binary code.

Because of the complexity of the circuit, computers use binary numbers, only 0 and 1, and each binary number is one, which is the easiest to express by the circuit. For example, 0 indicates that the circuit is blocked, and 1 indicates that the circuit is not blocked. When we usually use a computer, we don't feel that it is using binary calculation, because the computer will automatically convert the information you input into binary, and then convert the calculated binary number into information that you can see and display it on the screen.

The rule of binary addition: It is the same as the rule of decimal addition, but it must be binary because binary only has 0 and 1 two digits. The formula is: 0+0 = 0,0+1,1 = 1.

The rule of binary subtraction: it is the same as the rule of decimal subtraction, but when one is not reduced enough, you should borrow one from the former to reduce it to two.

The formula of binary multiplication: 0 * 0 = 0, 0 * 1 = 0, 1 * 0 = 0, 1 * 1 = 1.

Binary division rule: same as decimal division rule.