What is the C language variable?

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Introduction of C language variables

The variable is equivalent to the representation of a data storage space in memory, you can think of the variable as the house number of a room, we can find the room through the house number, and the variable (value) can be accessed through the variable name.

Basic steps for using variables

1) declare variables

Int num

2) assignment

Num = 60

3) use

Printf ("num=%d", num)

4) it can also be achieved in one step: int num2 = 99

Case study of getting started with variable

Look at the demo and explain the code

/ / 1. Declare a variable [tell the computer to open a room]

Int num = 1; / / Integer

Double score = 2.3; / / decimal

Char gender = 'Aids; / / character

Char name [] = "Qingyu"; / / string

# include void main () {int num = 1; double score = 123; char sex='N'; char name [] = "Qingyu" / / output / * if output is integer% d if output is decimal% f, keep two decimal places% .2f if output is character% c if output is string% s * / output different data with% s * / / The corresponding format should correspond to printf ("num=%d,score=%.2f,sex=%c,name=%s", num,score,sex,name). Notes on the use of getchar ();} variables

1) the variable represents a storage area in memory (different data types take up different amounts of space)

2) the area has its own name and type

3) variables must be declared before using

4) the data in this area can be constantly changed within the same type.

5) variables cannot have the same name in the same scope

6) three elements of variables (variable name + value + data type), please pay attention to this.

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