What is a data type? What is the use of data types?

Basic data type

What is data type

Data types are like a model ,short、int、long、char、float、double These six are molds of different sizes .

What's the use of data types

Take them and click on the memory , Different sizes of memory are allocated , Of course, don't forget to give them a nice name . stay 32 Bit system short The size of the clicked memory is 2 individual byte;int The size of the clicked memory is 4 individual byte;long The size of the clicked memory is 4 individual byte;float The size of the clicked memory is 4 individual byte;double The size of the clicked memory is 8 individual byte;char The size of the clicked memory is 1 individual byte.（ Note that this refers to the general situation , Maybe different platforms will be different , The specific platform can use sizeof Keyword test ）.