Initial commit: Pi calculation benchmark with 34 languages

- Added implementations for: bash, brainfuck, c, cpp, crystal, csharp, d, dart, elixir, erlang, fortran, go, haskell, java, javascript, julia, kotlin, objective-c, scala, typescript, lua, nim, odin, perl, php, python, r, ruby, rust, swift, zig, assembly, vimscript, wolfram
- All implementations use Machin's formula: π/4 = 4*arctan(1/5) - arctan(1/239)
- Build system with ./build.sh, test system with ./test.sh
- Performance testing with ./run_all.sh
- Comprehensive README.md explaining performance differences
- Test framework verifies correctness against known π values

kotlin/cmd/build.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Kotlin Build Script
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "=== Kotlin Build ==="
+echo ""
+
+# Check for kotlinc
+if ! command -v kotlinc &> /dev/null; then
+    echo "✗ Kotlin-kompilator hittades inte!"
+    echo "  Installera Kotlin: brew install kotlin"
+    exit 1
+fi
+
+echo "Använder: kotlinc"
+
+# Compile
+mkdir -p bin
+if kotlinc -include-runtime -d bin/print_hej.jar src/print_hej.kt 2>&1; then
+    echo "✓ Kompilering lyckades!"
+    echo "  Executable: bin/print_hej.jar"
+    echo ""
+    
+    # Skapa wrapper script
+    cat > bin/print_hej << 'EOF'
+#!/bin/bash
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+java -jar bin/print_hej.jar "$@"
+EOF
+    chmod +x bin/print_hej
+    
+    echo "För att köra:"
+    echo "  ./bin/print_hej <decimaler>"
+else
+    echo "✗ Kompilering misslyckades!"
+    exit 1
+fi

kotlin/src/print_hej.kt

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+import java.math.BigInteger
+import kotlin.system.exitProcess
+
+// Calculate arctan(1/x) using Taylor series
+// arctan(1/x) = 1/x - 1/(3*x^3) + 1/(5*x^5) - ...
+fun arctan(x: Int, decimals: Int): BigInteger {
+    val scale = BigInteger.TEN.pow(decimals + 10)
+    val xBig = BigInteger.valueOf(x.toLong())
+    val xSquared = xBig * xBig
+    
+    var term = scale / xBig
+    var result = BigInteger.ZERO
+    var n = 0
+    
+    while (term != BigInteger.ZERO && n < decimals * 3) {
+        val divisor = BigInteger.valueOf(2L * n + 1)
+        val contrib = term / divisor
+        
+        if (n % 2 == 0) {
+            result += contrib
+        } else {
+            result -= contrib
+        }
+        
+        term = term / xSquared
+        n++
+    }
+    
+    return result
+}
+
+fun calculatePi(decimals: Int): BigInteger {
+    val atan1_5 = arctan(5, decimals)
+    val atan1_239 = arctan(239, decimals)
+    
+    // pi = 16*arctan(1/5) - 4*arctan(1/239)
+    return atan1_5 * BigInteger.valueOf(16) - atan1_239 * BigInteger.valueOf(4)
+}
+
+fun main(args: Array<String>) {
+    var decimals = 100
+    
+    if (args.isNotEmpty()) {
+        try {
+            decimals = args[0].toInt()
+            if (decimals < 1) decimals = 100
+        } catch (e: NumberFormatException) {
+            decimals = 100
+        }
+    }
+    
+    val pi = calculatePi(decimals)
+    val piStr = pi.toString()
+    
+    // Print with decimal point
+    print("3.")
+    val startIndex = 1
+    val endIndex = minOf(startIndex + decimals, piStr.length)
+    print(piStr.substring(startIndex, endIndex))
+    
+    // Pad with zeros if needed
+    for (i in 0 until decimals - (endIndex - startIndex)) {
+        print("0")
+    }
+    println()
+}