I. Definition of Integer
Integer is a basic concept in digital system. It does not include decimals or fractions, it is a number that can be used for counting and measuring. Therefore, it is natural that positive integer, negative integer and zero are called integers.
Second, the characteristics of positive integers
The Sun Qiang number of a positive shirt is an integer greater than zero, which can represent quantity, length, area and so on. Positive integers are characterized by addition, subtraction, multiplication and division, and have many applications, such as algebra, geometry and physics.
Third, the characteristics of negative integers
A negative integer is an integer less than zero, which can indicate arrears, temperature drop, height drop, etc. Negative integer is the opposite of positive integer in addition operation, and can be calculated by absolute value in multiplication operation.
Fourth, the practical application of integers
Integer is widely used, for example, in computer programming, integer type is one of the basic data types in programming language, which is used to represent variables such as quantity, time and state. In statistics, integers are used to represent variables such as population, income and output.
Classification, operation rules and history of integers
I. Integer classification
Besides positive and negative integers, there are other integers, such as natural numbers, even numbers, odd numbers, prime numbers and so on. These integer classifications have very important applications in mathematics, such as the application of prime numbers in cryptography.
Second, the operation rules of integers
The operation rules of integers are addition, subtraction, multiplication, division and modulus. These rules apply not only to integers, but also to real numbers and complex numbers. Mastering the operation law of integers is not only helpful to the study of mathematics, but also can be applied to the occasions of bill settlement and length measurement in daily life.
Third, the history of Sun Chang integers.
Integers also have an important position in history. Early or chained ancient civilizations began to use integers for counting and measurement, such as in Egypt, Sumer, India and other places. In the 6th century BC, Pythagoras, an ancient Greek mathematician, put forward the concept of integer, which started the research of integer science.