What is the method for defining and declaring structs in C++?

In C++, structures can be defined and declared using the following methods:

1. Directly define and declare:

struct MyStruct {
    int myInt;
    float myFloat;
};

MyStruct myVar;

1. Define a structure and declare variables.

struct MyStruct {
    int myInt;
    float myFloat;
} myVar;

1. Use typedef to define an alias for a structure and declare a variable.

typedef struct {
    int myInt;
    float myFloat;
} MyStruct;

MyStruct myVar;

1. Declare a struct using the keyword ‘struct’ and define variables.

struct MyStruct {
    int myInt;
    float myFloat;
};

struct MyStruct myVar;

Regardless of the method used, the definition and declaration of a structure require specifying the name of the structure and the types and names of its member variables.