Namespaces are a mechanism for organizing code in C that allow developers to use the same identifier to avoid name conflicts, organize related code, improve code readability, and reuse code. To use a namespace, use namespace namespace name { // code within the namespace }, and use namespace name::identifiername to access the identifier.
What is a namespace in C?
Namespace is a mechanism for organizing and managing C code, which allows developers to define a related set of identifiers (such as classes, functions, variables) for different parts of the same application .
The role of namespace
The namespace is mainly used for the following purposes:
Using namespaces
To use namespaces, you need to use the following syntax:
<code class="cpp">namespace 命名空间名称 { // 命名空间内的代码 }</code>
To access identifiers within a namespace, Please use the following syntax:
<code class="cpp">命名空间名称::标识符名称</code>
Example
The following example demonstrates how to use namespaces to avoid name conflicts:
<code class="cpp">// source_file1.cpp namespace MyMath { int sum(int a, int b) { return a + b; } } // source_file2.cpp namespace MyString { int length(const char* str) { return strlen(str); } } // main.cpp int main() { cout << MyMath::sum(1, 2) << endl; // 输出 3 cout << MyString::length("Hello") << endl; // 输出 5 }</code>
In this example, two Different namespaces (MyMath
and MyString
) are used to avoid name conflicts for the sum
and length
functions.
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