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Try this example:

MyC.c

#include <stdio.h> void changeInput(int *output) { *output = 5; } typedef struct student Student ; void passByStudent(Student stu); struct student { int id; const char *name; float percentage; }; void passByStudent(Student stu) { stu.id = 5; } 

ViewController.swift

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") let input: String? = "strudent name" let stu = student(id: 1, name: input?.cString(using: .utf8), percentage: 10.0) passByStudent(stu) } } 

Follow this example step-by-step:

1. Create a Swift Project

2. Create MyC.c file and write code.

3. Click on your project.
4. Click the Build Setting Tab.
5. Select all tab
6. search with Objective-c Bridging Header
7. Double click Here.
8. After that left-click on MyC.c file, drag and drop inside popup layer.

9. You can define your function inside Practice-Bridging-Header.h

   void changeInput(int *output);

10. Write code inside your ViewController.

Code:

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") let input: String? = "strudent name" let stu = student(id: 1, name: input?.cString(using: .utf8), percentage: 10.0) passByStudent(stu) } } 

Just simply call with a student ref there contain UnsafePointer name.

let stu = student(id: 1, name: input?.cString(using: .utf8), percentage: 10.0) passByStudent(stu) 

Try this example:

MyC.c

#include <stdio.h> void changeInput(int *output) { *output = 5; } typedef struct student Student ; void passByStudent(Student stu); struct student { int id; const char *name; float percentage; }; void passByStudent(Student stu) { stu.id = 5; } 

ViewController.swift

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") let input: String? = "strudent name" let stu = student(id: 1, name: input?.cString(using: .utf8), percentage: 10.0) passByStudent(stu) } } 

Follow this example step-by-step:

1. Create a Swift Project

2. Create MyC.c file and write code.

3. Click on your project.
4. Click the Build Setting Tab.
5. Select all tab
6. search with Objective-c Bridging Header
7. Double click Here.
8. After that left-click on MyC.c file, drag and drop inside popup layer.

9. You can define your function inside Practice-Bridging-Header.h

   void changeInput(int *output);

10. Write code inside your ViewController.

Code:

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") let input: String? = "strudent name" let stu = student(id: 1, name: input?.cString(using: .utf8), percentage: 10.0) passByStudent(stu) } } 

try this

let h3Index = withUnsafePointer(to: geoCoord) { (pointer: UnsafePointer<GeoCoord>) -> H3Index in return geoToH3($0, 5) } 

Follow this example step-by-step:

1. Create a Swift Project

2. Create MyC.c file and write code.

3. Click on your project.
4. Click the Build Setting Tab.
5. Select all tab
6. search with Objective-c Bridging Header
7. Double click Here.
8. After that left-click on MyC.c file, drag and drop inside popup layer.

9. Define your function inside Practice-Bridging-Header.h

   void changeInput(int *output);

10. Write code inside your ViewController.

Code:

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") } } 

Try this example:

MyC.c

#include <stdio.h> void changeInput(int *output) { *output = 5; } typedef struct student Student ; void passByStudent(Student stu); struct student { int id; const char *name; float percentage; }; void passByStudent(Student stu) { stu.id = 5; } 

ViewController.swift

import UIKit class ViewController: UIViewController { override func viewDidLoad() {  super.viewDidLoad() var output: CInt = 0 changeInput(&output)    print("output: \(output)")  let input: String? = "strudent name" let stu = student(id: 1, name: input?.cString(using: .utf8), percentage: 10.0) passByStudent(stu) } } 

Follow this example step-by-step:

1. Create a Swift Project

2. Create MyC.c file and write code.

3. Click on your project.
4. Click the Build Setting Tab.
5. Select all tab
6. search with Objective-c Bridging Header
7. Double click Here.
8. After that left-click on MyC.c file, drag and drop inside popup layer.

9. You can define your function inside Practice-Bridging-Header.h

   void changeInput(int *output);

10. Write code inside your ViewController.

Code:

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") let input: String? = "strudent name" let stu = student(id: 1, name: input?.cString(using: .utf8), percentage: 10.0) passByStudent(stu) } } 

Follow this example step-by-step:

1. Create a Swift Project

2. Create MyC.c file and write code.

3. Click on your project.
4. Click the Build Setting Tab.
5. Select all tab
6. search with Objective-c Bridging Header
7. Double click Here.
8. After that left-click on MyC.c file, drag and drop inside popup layer.

9. Define your function inside Practice-Bridging-Header.h

   void changeInput(int *output);

10. Write code inside your ViewController.

Code:

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") } } 

try this

let h3Index = withUnsafePointer(to: geoCoord) { (pointer: UnsafePointer<GeoCoord>) -> H3Index in return geoToH3($0, 5) } 

Follow this example step-by-step:

1. Create a Swift Project

2. Create MyC.c file and write code.

3. Click on your project.
4. Click the Build Setting Tab.
5. Select all tab
6. search with Objective-c Bridging Header
7. Double click Here.
8. After that left-click on MyC.c file, drag and drop inside popup layer.

9. Define your function inside Practice-Bridging-Header.h

   void changeInput(int *output);

10. Write code inside your ViewController.

Code:

import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() var output: CInt = 0 changeInput(&output) print("output: \(output)") } }