Hi, I'm fairly new to Modelica and c (java and matlab guy, not a prolific programmer) and I'm having trouble getting modelica to import a c function.
the C function is:

#include <stdlib.h>
#include <time.h>
#include <stdio.h>
int main(float y)
{
    srand ( time(NULL) );
    float r = (float)rand()/(float)RAND_MAX;
    r = (float)rand()/(float)RAND_MAX;
    int x=r*100;
    return x;
}

The C is just supposed to generate a random integer from 1-100
The function I use to import is:

function RNG
  input Real y;
  output Real r;
  external "C" r=main(y)  annotation(Include = "#include <main.c>");
end RNG;

And the model i'm using as a test case is:

model testmodel
  Real y =0; 
  Real r;
equation
r= RNG(y);
end testmodel;

I continue to get a error message when i try and simulate/check:
Error building simulator. Buildlog: gcc   -falign-functions -msse2 -mfpmath=sse   -I"C:/OpenModelica1.9.0//include/omc" -I.    -c -o RLCpack.testmodel.o RLCpack.testmodel.c
In file included from RLCpack.testmodel.c:18:
C:/OpenModelica1.9.0//include/omc/main.c:4: error: conflicting types for 'main'
RLCpack.testmodel_functions.h:19: note: previous declaration of 'main' was here
RLCpack.testmodel.c:374: error: conflicting types for 'main'
RLCpack.testmodel_functions.h:19: note: previous declaration of 'main' was here
mingw32-make: *** [RLCpack.testmodel.o] Error 1

Both the function and model pass the check test in OMEdit, but when I try to run it spits out this error
I'm not exactly sure where to start with this error and any help would be appreciated. Or if you know of an easier way to generate random numbers.