This is (should be) the exact equivalent of the Cilia code in C#:

• Types
  • int, long, float
• Variables
  • int x = 42;
  • var x = 42;
  • const int x = 42;
  • var words = new List<string>();
  • var names = new HashSet<string>();
  • var contactInfoForID = new Dictionary<string, ContactInfo>();
• Functions
  • static int multiply(int a, int b) { return a * b; }
  • static void print(ContactInfo a) { ... }
  • static string concat(string a, string b) { return ...; }
• Loops
  • for (int i = 1; i <= 10; ++i) { ... }
  • for (var i = 0; i < words.Count; ++i) { ... }
  • foreach (var i in new[] { 5, 7, 11, 13 }) { ... }
  • foreach (var word in words) { ... }

In C# int and 42 are 32 bit wide, not 64 bit.
That’s Ok, this is a syntax comparison, not a performance benchmark.