I'm finding massive performance differences between similar code in C anc C#.

The C code is:

#include <stdio.h>
#include <time.h>
#include <math.h>

main()
{
    int i;
    double root;

    clock_t start = clock();
    for (i = 0 ; i <= 100000000; i++){
    	root = sqrt(i);
    }
    printf("Time elapsed: %f\n", ((double)clock() - start) / CLOCKS_PER_SEC);	

}

And the C# (console app) is:

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime startTime = DateTime.Now;
            double root;
            for (int i = 0; i <= 100000000; i++)
            {
                root = Math.Sqrt(i);
            }
            TimeSpan runTime = DateTime.Now - startTime;
            Console.WriteLine("Time elapsed: " + Convert.ToString(runTime.TotalMilliseconds/1000));
        }
    }
}

With the above code, the C# completes in 0.328125 seconds (release version) and the C takes 11.14 seconds to run.

The c is being compiled to a windows executable using mingw.

I've always been under the assumption that C/C++ were faster or at least comparable to C#.net. What exactly is causing the C to run over 30 times slower?

EDIT: It does appear that the C# optimizer was removing the root as it wasn't being used. I changed the root assignment to root += and printed out the total at the end. I've also compiled the C using cl.exe with the /O2 flag set for max speed.

The results are now: 3.75 seconds for the C 2.61 seconds for the C#

The C is still taking longer, but this is acceptable