If we want to print something in CAML, we have to use this structure

```Ocaml
# print_string "Hello World!";;
Hello! - : unit=()

# print_int ;;
-: int -> unit = <fun>

(*expression*)
# print_[type] [things to print];;
[things to print] -: unit=()
```

[![](https://mermaid.ink/img/pako:eNpFjsEKwjAQRH8lLOLJ_kAPguixvejReFiSrQ002bJuUCn9d9OKOKfhMczMBI49QQ3dwE_Xo6hpzjaZouOhbUxVGcdxDAMVuzebq7ktjF7kVvBQTB7FV5x1zGq2f0IiLLCDSBIx-LIxLcUWtKdIFupiPXWYB7Vg01yimJUv7-SgVsm0gzx6VDoFvAvGHyQflKX93l7fzx9XV0DK?type=png)](https://mermaid.live/edit#pako:eNpFjsEKwjAQRH8lLOLJ_kAPguixvejReFiSrQ002bJuUCn9d9OKOKfhMczMBI49QQ3dwE_Xo6hpzjaZouOhbUxVGcdxDAMVuzebq7ktjF7kVvBQTB7FV5x1zGq2f0IiLLCDSBIx-LIxLcUWtKdIFupiPXWYB7Vg01yimJUv7-SgVsm0gzx6VDoFvAvGHyQflKX93l7fzx9XV0DK)