errors with void

[vikingcarioca]

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

/*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);
}

[Elysia]

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

		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:

		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));

[vikingcarioca]

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

[matsp]

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

[vikingcarioca]

well it still doesnt compile i have this error

	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

[matsp]

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