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

ruby/src/print_hej.rb

@@ -0,0 +1,50 @@
+# Calculate arctan(1/x) using Taylor series with integer arithmetic
+def arctan(x, decimals)
+  scale = 10 ** (decimals + 10)
+  x_squared = x * x
+  
+  result = 0
+  term = scale / x
+  
+  n = 0
+  while term != 0 && n < decimals * 3
+    divisor = 2 * n + 1
+    contrib = term / divisor
+    
+    if n % 2 == 0
+      result += contrib
+    else
+      result -= contrib
+    end
+    
+    term = term / x_squared
+    n += 1
+  end
+  
+  result
+end
+
+# Calculate pi using Machin's formula
+def calculate_pi(decimals)
+  atan1_5 = arctan(5, decimals)
+  atan1_239 = arctan(239, decimals)
+  
+  16 * atan1_5 - 4 * atan1_239
+end
+
+# Format pi with decimal point
+def format_pi(pi, decimals)
+  pi_str = pi.to_s
+  # Pad with leading zeros if needed
+  while pi_str.length < decimals + 10
+    pi_str = '0' + pi_str
+  end
+  "3.#{pi_str[1, decimals]}"
+end
+
+# Main
+decimals = ARGV[0]&.to_i || 100
+decimals = 100 if decimals <= 0
+
+pi = calculate_pi(decimals)
+print format_pi(pi, decimals)

ruby/src/test_pi.rb

@@ -0,0 +1,49 @@
+require 'test/unit'
+require 'open3'
+
+class PiTest < Test::Unit::TestCase
+  SCRIPT_PATH = '/Users/einand/Code/test/ruby/print_hej.rb'
+  
+  def run_script(*args)
+    cmd = ['ruby', SCRIPT_PATH] + args.map(&:to_s)
+    stdout, _ = Open3.capture2(*cmd)
+    stdout.strip
+  end
+  
+  def test_10_decimals
+    result = run_script(10)
+    expected = '3.1415926535'
+    assert_equal expected, result
+  end
+  
+  def test_5_decimals
+    result = run_script(5)
+    expected = '3.14159'
+    assert_equal expected, result
+  end
+  
+  def test_1_decimal
+    result = run_script(1)
+    expected = '3.1'
+    assert_equal expected, result
+  end
+  
+  def test_100_decimals
+    result = run_script(100)
+    expected = '3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679'
+    assert_equal expected, result
+  end
+  
+  def test_default_100_decimals
+    result = run_script
+    expected = '3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679'
+    assert_equal expected, result
+  end
+  
+  def test_10000_decimals
+    result = run_script(10000)
+    # Check length: "3." + 10000 digits = 10002 characters
+    assert_equal 10002, result.length
+    assert result.start_with?('3.14159')
+  end
+end