Add console calculator using Bridging Header

Interop-BridgingHeader/.gitignore

@@ -0,0 +1,8 @@
+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

Interop-BridgingHeader/Package.swift

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+// swift-tools-version: 6.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "Interop-BridgingHeader",
+    platforms: [.macOS(.v15)],
+    products: [
+        .library(name: "CMath", targets: ["CMath"]),
+        .executable(name: "Interop-BridgingHeader", targets: ["Interop-BridgingHeader"])
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(
+            name: "CMath"),
+        .executableTarget(
+            name: "Interop-BridgingHeader",
+            dependencies: ["CMath"],
+            swiftSettings: [.interoperabilityMode(.C)]
+        ),
+    ]
+)

Interop-BridgingHeader/Sources/CMath/cmath.c

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+//
+//  cmath.c
+//  CMath
+//
+//  Created by TheAlgorithm476 on 28/03/2025.
+//
+
+#include <stdint.h>
+#include "add_nums.h"
+#include "sub_nums.h"
+#include "mul_nums.h"
+#include "div_nums.h"
+#include "spc_nums.h"
+
+double add_nums(double a, double b) {
+    return a + b;
+}
+
+double sub_nums(double a, double b) {
+    return b - a;
+}
+
+double mul_nums(double a, double b) {
+    return a * b;
+}
+
+double div_nums(double a, double b) {
+    if (a == 0) return 0; // Cannot divide by 0
+    
+    return b / a;
+}
+
+// Uses "poor man's pow" to determine the power of a fractional exponent.
+double pow(double x, double exp) {
+    if (x == 0) return 0;
+    if (exp == 0) return 1;
+    if (exp < 0) return 1 / pow(x, -exp);
+    
+    int full_part = (int) exp;
+    double frac_part = exp - full_part;
+    double result = 1.0;
+    
+    // int pow
+    for (size_t i = 0; i < full_part; i++) {
+        result *= x;
+    }
+    
+    // Approximate fraction
+    if (frac_part != 0) {
+        double temp = 1.0;
+        double term = 1.0;
+        
+        for (size_t i = 1; i < POOR_MANS_POW_GUESSES; i++) {
+            term *= (frac_part * (x - 1)) / i;
+            temp += term;
+        }
+        
+        result *= temp;
+    }
+    
+    return result;
+}
+
+// Uses Newton's Square Root to get a decent guess of the sqrt.
+double sqrt(double x) {
+    if (x <= 0) return 0; // Negative roots are way out of scope for this thesis.
+    
+    double guess = x / 2.0;
+    
+    for (size_t i = 0; i < NEWTONIAN_DIV_GUESSES; i++) {
+        guess = (guess + x / guess) / 2.0;
+    }
+    
+    return guess;
+}

Interop-BridgingHeader/Sources/CMath/include/CMath.h

@@ -1,5 +1,5 @@
 //
-//  CMath-Bridging-Header.h
+//  CMath.h
 //  Interop-BridgingHeader
 //
 //  Created by TheAlgorithm476 on 09/04/2025.

Interop-BridgingHeader/Sources/CMath/include/add_nums.h

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+//
+//  add_nums.h
+//  CMath
+//
+//  Created by TheAlgorithm476 on 28/03/2025.
+//
+
+#ifndef __ADD_NUMS_H
+#define __ADD_NUMS_H
+
+double add_nums(double a, double b);
+
+#endif // __ADD_NUMS_H

Interop-BridgingHeader/Sources/CMath/include/div_nums.h

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+//
+//  div_nums.h
+//  CMath
+//
+//  Created by TheAlgorithm476 on 28/03/2025.
+//
+
+#ifndef __DIV_NUMS_H
+#define __DIV_NUMS_H
+
+double div_nums(double a, double b);
+
+#endif // __DIV_NUMS_H

Interop-BridgingHeader/Sources/CMath/include/mul_nums.h

@@ -0,0 +1,13 @@
+//
+//  mul_nums.h
+//  CMath
+//
+//  Created by TheAlgorithm476 on 28/03/2025.
+//
+
+#ifndef __MUL_NUMS_H
+#define __MUL_NUMS_H
+
+double mul_nums(double a, double b);
+
+#endif // __MUL_NUMS_H

Interop-BridgingHeader/Sources/CMath/include/spc_nums.h

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+//
+//  spc_nums.h
+//  CMath
+//
+//  Created by TheAlgorithm476 on 28/03/2025.
+//
+
+#ifndef __SPC_NUMS_H
+#define __SPC_NUMS_H
+
+#define POOR_MANS_POW_GUESSES 12
+#define NEWTONIAN_DIV_GUESSES 12
+
+double pow(double x, double exp);
+double sqrt(double x);
+
+#endif // __SPC_NUMS_H

Interop-BridgingHeader/Sources/CMath/include/sub_nums.h

@@ -0,0 +1,13 @@
+//
+//  sub_nums.h
+//  CMath
+//
+//  Created by TheAlgorithm476 on 28/03/2025.
+//
+
+#ifndef __SUB_NUMS_H
+#define __SUB_NUMS_H
+
+double sub_nums(double a, double b);
+
+#endif // __SUB_NUMS_H

Interop-BridgingHeader/Sources/Interop-BridgingHeader/main.swift

@@ -1,4 +1,96 @@
-// The Swift Programming Language
+import CMath
-// https://docs.swift.org/swift-book
+import Foundation
 
-print("Hello, world!")
+func readNumber(prompt: String) -> Double? {
+    print(prompt, terminator: " ")
+    
+    if let input = readLine(), let number = Double(input) {
+        return number
+    } else {
+        print("ERROR: Input was not a valid number!")
+        return nil
+    }
+}
+
+func main() {
+    while true {
+        print("""
+              Console Calculator -- Operations:
+              1 - Addition
+              2 - Subtraction
+              3 - Multiplication
+              4 - Division
+              5 - Power
+              6 - Square Root
+              
+              q - Quit the application
+              """)
+        print("Please enter your choice: ", terminator: "")
+        
+        if let operation = readLine() {
+            if operation.lowercased( ) == "q" {
+                break
+            }
+            
+            switch operation {
+            case "1":
+                if let number1 = readNumber(prompt: "Please enter the first number:"),
+                   let number2 = readNumber(prompt: "Please enter the second number:") {
+                    let result = add_nums(number1, number2)
+                    print("Result: \(result)")
+                }
+                
+            case "2":
+                if let number1 = readNumber(prompt: "Please enter the first number:"),
+                   let number2 = readNumber(prompt: "Please enter the second number:") {
+                    let result = sub_nums(number1, number2)
+                    print("Result: \(result)")
+                }
+                
+            case "3":
+                if let number1 = readNumber(prompt: "Please enter the first number:"),
+                   let number2 = readNumber(prompt: "Please enter the second number:") {
+                    let result = mul_nums(number1, number2)
+                    print("Result: \(result)")
+                }
+                
+            case "4":
+                if let number1 = readNumber(prompt: "Please enter the first number:"),
+                   let number2 = readNumber(prompt: "Please enter the second number:") {
+                    if number2 == 0 {
+                        print("ERROR: Division by zero!")
+                        continue
+                    }
+                    
+                    let result = div_nums(number1, number2)
+                    print("Result: \(result)")
+                }
+                
+            case "5":
+                if let number1 = readNumber(prompt: "Please enter the base:"),
+                   let number2 = readNumber(prompt: "Please enter the exponent:") {
+                    let result = pow(number1, number2)
+                    print("Result: \(result)")
+                }
+                
+            case "6":
+                if let number = readNumber(prompt: "Please enter the number to calculate the square root for:") {
+                    if number < 0 {
+                        print("ERROR: Cannot take the Square Root of a negative number!")
+                        continue
+                    }
+                    
+                    let result = sqrt(number)
+                    print("Result: \(result)")
+                }
+                
+            default:
+                print("ERROR: Invalid operation!")
+            }
+        } else {
+            break
+        }
+    }
+}
+
+main()