---
tags:
  - C
---

A `struct` is a custom, user-defined type, in constrast to the primitive types
(`int`, `char`, `float` etc). They are known as **compound types**.

## Usage

Define the custom type:

```c
struct Person {
    int age;
    float height;
}
```

Then to apply the type to a variable:

```c
struct Person thomas
```

And define the sub-properties:

```c
thomas.age = 37
thomas.height = 5.8
```

Alternatively do all together:

```c
struct Person thomas = {
    .age = 37,
    .height = 5.8
}
```