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Today, the editor will share with you the relevant knowledge points about the scope of C language and the role of arrays. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article, let's take a look at it.

Scope

In any kind of programming, the scope is the area where the variable defined in the program exists, beyond which the variable cannot be accessed. There are three places in C that you can declare variables:

A local variable inside a function or block

Global variables outside all functions

In the definition of function parameters of formal parameters

Global variable

Global variables are defined outside the function, usually at the top of the program. Global variables are valid throughout the program life cycle and can be accessed within any function.

Global variables can be accessed by any function. That is, global variables are available throughout the program after they are declared.

In the program, the names of the local variable and the global variable can be the same, but within the function, if the two names are the same, the local variable value will be used, and the global variable will not be used.

Array

The C language supports array data structures, which can store a fixed-size sequential collection of elements of the same type. An array is used to store a series of data, but it is often thought of as a series of variables of the same type. Specific elements in the array can be accessed through the index.

All arrays are made up of consecutive memory locations. The lowest address corresponds to the first element, and the highest address corresponds to the last element.

Declare array

To declare an array in C, you need to specify the type and number of elements, as follows:

TypearrayName [arraySize]

This is called an one-dimensional array. ArraySize must be an integer constant greater than zero, and type can be any valid C data type. For example, to declare an array balance with 10 elements of type double, the declaration statement is as follows:

Doublebalance [10]

Balance is now an available array that can hold 10 numbers of type double.

These are all the contents of the article "what is the scope of C language and what is the use of arrays?" Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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