[David12]

Hey guys, I'm new to UDFs, and I've been having trouble with some code for the last couple of days and need some help. So essentially, what I've been doing is researching the acoustics of a propeller, and what I'm currently trying to do is create a UDF that makes a gaussian (normal) distribution of random values for the RPM and have the UDF select one at random. I've copied the code found on this website in order to do it, link: https://www.tutorialspoint.com/gener...in-c-cplusplus

When I run my code, I get a ton of errors. (posted below). I get this same error over and over, its so big that I just posted a snippet of it. I don't think it's a compiling error (but I could be wrong), because I've had compiling issues before and solved it and was able to compile other UDFs just fine. I'm thinking that maybe there's something wrong with my code? I'm not sure. Also, it might be a library issue with cstdlib and cmath, but I'm not sure because I have those two files in my Microsoft Visual file. Furthermore, the macro DEFINE_ZONE_MOTION is fine, because I've got it to work before this, its just the rand_gen( ) part that I'm having trouble with. I'm going to post my error, and then also my code

Errors:

C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(19): error C2061: syntax error: identifier 'noexcept'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(19): error C2059: syntax error: ';'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(20): error C2449: found '{' at file scope (missing function header?)
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(22): error C2059: syntax error: '}'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(29): error C2061: syntax error: identifier 'noexcept'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(29): error C2059: syntax error: ';'
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(30): error C2449: found '{' at file scope (missing function header?)
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\cstdlib(32): error C2059: syntax error: '}'

My Code:

#include "udf.h"
#include <stdlib.h>

#include <cstdlib>
#include <cmath>
#include <ctime>
#include <iostream>


FILE *fp;    

 
double rand_gen() 
{
 return ((double)(rand()) + 1.)/((double)(RAND_MAX) + 1.);                  
}
double normalRandom()
{ 
 double v1=rand_gen();
 double v2=rand_gen();
 return cos(2*3.14*v2)*sqrt(-2.*log(v1));
}



DEFINE_ZONE_MOTION(fmotion,omega,axis,origin,velocity,time,dtime)
{
    double sigma = 82.0;
    double Mi = 40.0;
    time = CURRENT_TIME;
    if (time < 0.1)
      {
        *omega = 2500.0 * time;
      }

    else
      {
        *omega = normalRandom()*sigma+Mi;
      }


    N3V_D (velocity,=,0.0,0.0,0.0);
    N3V_S(origin,=,0.0); 
    N3V_D(axis,=,0.0,1.0,0.0); 





    #if !RP_NODE 
    

    fp = fopen("data.txt","a+"); 
    fprintf(fp,"Random: %f Time: %f RPM: %f\n",r,time,*omega); 
    fclose(fp);    
    return;
    

    #endif  

}