F# Recipe #2 – The type int is not compatible with type unit

Problem

When writing your first F# program , you get the following error “The type int is not compatible with type unit”. You need to fix this.

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Solution

The type unit is F#’s version of void. This indicates that the compiler was expected an return value of int but there is no return value.

This can be fixed by adding 0 to the end to return 0 as shown in the screenshot below.

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