> For the complete documentation index, see [llms.txt](https://muradkarakas.gitbook.io/sodium_documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://muradkarakas.gitbook.io/sodium_documentation/language-reference/built-in-functions/built-in-string-functions-and-operands/the-sizeof-operator.md).

# The "sizeof" Operator

You can use the `sizeof` operator to obtain the size (in bytes) of the data type of its operand. The operand may be an actual type specifier (such as `int` or `date`), as well as any valid expression. If the parameter is type of string, you can also use `strlen` function. Here are some examples:

```
int a = sizeof(int);
int b = sizeof(bool);
int c = sizeof(5);
int d = sizeof(5.143);
int e = sizeof(a);
```

 The result of the `sizeof` operator is of type `int`.