using System;   
using System.CodeDom.Compiler;   
using System.Collections.Generic;   
using Microsoft.CSharp;   
     
namespace ConsoleCompiler   
{   
      internal class Program   
      {   
          private static void Main(string[] args)   
          {   
              // Source code для компиляции   
              string source =   
              @"   
namespace Foo   
{   
      public class Bar   
      {   
          static void Main(string[] args)   
          {   
              Bar.SayHello();   
          }   
     
          public static void SayHello()   
          {   
              System.Console.WriteLine(""Hello World"");   
          }   
      }   
}   
              ";   
     
              // Настройки компиляции   
              Dictionary<string, string> providerOptions = new Dictionary<string, string>   
                  {   
                      {"CompilerVersion", "v3.5"}   
                  };   
              CSharpCodeProvider provider = new CSharpCodeProvider(providerOptions);   
     
              CompilerParameters compilerParams = new CompilerParameters   
                  {OutputAssembly = "D:\\Foo.EXE", GenerateExecutable = true};   
     
              // Компиляция   
              CompilerResults results = provider.CompileAssemblyFromSource(compilerParams, source);   
     
              // Выводим информацию об ошибках   
              Console.WriteLine("Number of Errors: {0}", results.Errors.Count);   
              foreach (CompilerError err in results.Errors)   
              {   
                  Console.WriteLine("ERROR {0}", err.ErrorText);   
              }   
          }   
      }   
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
      FILE *fp = fopen("test.c","w");
      fputs("#include <stdio.h>\n",fp);
      fputs("int main(){\n",fp);             //  Можно и на одной строчке конечно, но получится не красиво.
      fputs("printf(\"Hello world\");\n",fp);
      fputs("}",fp);
      fclose(fp);
      system("gcc test.c -o test.exe -Wl,--subsystem,console");
      system("DEL test.c");
      system("test.exe");
}