How to call C from Swift?

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Yes, you can of course interact with Apple’s C libraries. Here is explained how.

Basically, the C types, C pointers, etc., are translated into Swift objects, for example a C int in Swift is a CInt.

I’ve built a tiny example, for another question, which can be used as a little explanation, on how to bridge between C and Swift:

main.swift

import Foundation

var output: CInt = 0
getInput(&output)

println(output)

UserInput.c

#include <stdio.h>

void getInput(int *output) {
    scanf("%i", output);
}

cliinput-Bridging-Header.h

void getInput(int *output);

Here is the original answer.

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