How to type square brackets in c++

There are five kinds of bracket characters in C: parentheses are used for function calls, conditional statements and control flow structures; square brackets are used for array/vector indexing and type conversion; curly brackets are used for code blocks; angle brackets are used for For template declarations and function overloading; parentheses are used to capture the variable list of a lambda expression.

Brackets in C

There are five bracket characters in the C programming language:

• Parentheses (()): used for function calls, conditional statements and control flow structures.
• Square brackets ([]): used for indexing and type conversion of arrays and vectors.
• Braces ({}): used for code blocks (such as function bodies, loop bodies, and conditional statement bodies).
• Angle brackets (<>): used for template declarations and function overloading.
• Parents (()): Used to capture the variable list of the lambda expression.

Parentheses

• Function call: myFunction(arg1, arg2);
• Conditional statement ：if (condition) { ... }
• Control flow structure: while (condition) { ... }, for (initializer; condition ; increment) { ... }

square brackets

• Array index: array[index];
• Vector index: vector[index];
• Type conversion: static_cast<type>(expression);

Braces

• Function body:

  <code class="cpp">void myFunction() {
  // 代码块
  }</code>

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• Loop body:

  <code class="cpp">while (condition) {
  // 代码块
  }</code>

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• Conditional statement body:

  <code class="cpp">if (condition) {
  // 代码块
  }</code>

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Angle brackets

• Template declaration: template<typename T> class MyTemplate { ... };
• Function overloading: int myFunction(int arg); double myFunction(double arg);

Parents

• Capture the variable list of the lambda expression:

  <code class="cpp">auto myLambda = [](int& number) {
  // 访问捕获的变量 number
  };</code>

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