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home / developersection / forums / difference between “struct” and “typedef struct” in c++?
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Utpal Vishwas
Utpal Vishwas

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I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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1 Answers

Aryan Kumar
Aryan Kumar 10 Jul 2023
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In C++, the struct keyword is used to define a structure, which is a data type that can contain multiple different types of data. The typedef keyword is used to create an alias for a data type.

The main difference between struct and typedef struct is that struct defines a new data type, while typedef struct simply creates an alias for an existing data type. This means that you can use a struct to declare variables, while you can only use a typedef struct to refer to a variable that has already been declared using a struct.

For example, the following code defines a struct called Point:

C++

struct Point {
  int x;
  int y;
};

The following code declares a variable of type Point:

C++

Point point;

The following code declares a typedef called Point that refers to the struct of the same name:

C++

typedef struct Point Point;

The following code declares a variable of type Point:

C++

Point point;

In both cases, the variable point will be of type Point. However, the first code defines a new data type called Point, while the second code simply creates an alias for the existing data type struct Point.

In general, you should use struct if you want to define a new data type. You should use typedef struct if you want to refer to an existing data type without having to write out the full name of the data type every time you want to use it.

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