errors with void

hi again pals
I am trying to implemnt my source from fortran to c, using void instead subroutines as in fortran but something is wrong could you help me
here is my source

Code:

---

/*Laplace equation 2D*/
/*Build the Mesh*/
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#define max 100
int
main()
{
        FILE *mesh;
        float dx,x[max],y[max],f[max][max],u[max][max],v[max][max],c[max][max];
        float ys,xs,il,it,ui;
       
        int imax,jmax,i,j,s;
        mesh=fopen("mesh.data","w");
       
        il=11;
        it=31;
        imax=41;
        jmax=12;
        ys=1.24;
        xs=1.24;
        ui=0.5;
        /*Generating the Mesh*/
        dx=-1.0/(il-it);
       
        for (i=il;i<=it;i++)
        {
                x[i]=(i-il)*dx;
               
        }
        for (i=it+1;i<=imax;i++)
        {
                x[i]=x[i-1]+(x[i-1]-x[i-2])*xs;
               
        }
        for(i=il-1;i>=1;i--)
        {
            x[i]=x[i+1]+(x[i+1]-x[i+2])*xs;
           
        }
        y[1]=-dx/2;
        y[2]=dx/2;
        for(j=3;j<=jmax;j++)
        {
            y[j]=y[j-1]+(y[j-1]-y[j-2])*ys;
        }
       
        /*Print the Results*/
        for(j=1;j<=jmax;j++)
        {
                for(i=1;i<=imax;i++)
                fprintf(mesh,"%1.15f  %1.15f\n",x[i],y[j]);
        }
        fclose(mesh);
        /*Initial Conditions*/
        for(i=1;i<=imax;i++)
        {
                for(j=1;j<=jmax;j++)
                f[i][j]=ui*x[i];
               
        }
        /*Calculus of Velocities*/
        for(i=2;i<=imax-1;i++)
        {
                for(j=2;j<=jmax-1;j++)
                u[i][j]=(f[i+1][j]-f[i-1][j])/(x[i+1]-x[i-1]);
                v[i][j]=(f[i][j+1]-f[i][j-1])/(y[j+1]-y[j-1]);
                c[i][j]=1.0-(power(u[i][j],2)+power(v[i][j],2));
        }
       
       
    void contour(float f[][],float x[],float y[],int jmax, int imax)
        {
        for(j=1;j<=jmax;j++)
        {
                f[1][j]=ui*x[1];
                f[imax][j]=ui*x[imax];
        }
        for(i=1;i<=imax;i++)
        {
                f[i][jmax]=ui*x[i];
                if((i>=il) && (i<=it))
                f[i][1]=f[i][2]-0.1*(y[2]-y[1])*(1.0-2*x[i]);
                else
                f[i][1]=f[i][2];
        }
        }// end contour ()
                 
       
       
       
       
       
       
       
       
       
       
       
        exit(0);
}

---

Functions cannot be placed inside each other.
Beware of things like this:

Code:

---

                for(j=2;j<=jmax-1;j++)
                u[i][j]=(f[i+1][j]-f[i-1][j])/(x[i+1]-x[i-1]);
                v[i][j]=(f[i][j+1]-f[i][j-1])/(y[j+1]-y[j-1]);
                c[i][j]=1.0-(power(u[i][j],2)+power(v[i][j],2));

---

Which is the same as:

Code:

---

                for(j=2;j<=jmax-1;j++)
                {
                        u[i][j]=(f[i+1][j]-f[i-1][j])/(x[i+1]-x[i-1]);
                }
                v[i][j]=(f[i][j+1]-f[i][j-1])/(y[j+1]-y[j-1]);
                c[i][j]=1.0-(power(u[i][j],2)+power(v[i][j],2));

---

my question is other, concerning to void in my source I dont get to run it

You are defining your function within another function. As far as I know, only gcc allows this behaviour. Move it outside of main, and it will probably compile. If it still doesn't compile, please post the error messages.

--
Mats

well it still doesnt compile i have this error

Code:

---

        for(j=1;j<=jmax;j++)
        {
                f[1][j]=ui*x[1];
                f[imax][j]=ui*x[imax];
        }

---

Error : arithmetic on pointer to an incomplete type

Yes, that's what I commented in the other thread on the same subject. It's the fact that you haven't described the size of the f array.

--
Mats