Function not showing any output

[usmannazir]

Dear friends
Can some one tell me why am I not able to print the simple output in the single function defined in the code below.

#include<stdio.h>
#include<iostream>
#include<math.h>
#include<stdlib.h>
int i, j;
const int grid=5;
double u_star[grid][grid], v_star[grid][grid];
double u_TDMA(double x[grid][grid],double y[grid][grid]);   //Function Declaration
using namespace std;
int main()
{
  for (i=0; i<grid; i++)
 {
    for(j=0; j<grid; j++)
   {
    u_star[i][j]=0;
    v_star[i][j]=0;
    }
}
double u_TDMA(double u_star[grid][grid],double v_star[grid][grid]); //Function Call
return 0;
}
double u_TDMA(double x[grid][grid],double y[grid][grid])   //Function Definition
{
  for (i=0; i<grid; i++)
  {
    for(j=0; j<grid; j++)
      {
	cout<<u_star[i][j]<<"\t"<<v_star[i][j];
      }
   }
}

[dutch]

What you are calling a "function call" is not a function call. It's just another function prototype.

#include <iostream>

using namespace std;

const int Size = 5;

double u_TDMA(double x[][Size], double y[][Size]);

int main()
{
  double u_star[Size][Size], v_star[Size][Size];
  for (int i = 0; i < Size; i++)
  {
    for (int j = 0; j < Size; j++)
    {
      u_star[i][j] = 0.0;
      v_star[i][j] = 0.0;
    }
  }
  u_TDMA(u_star, v_star);
}

double u_TDMA(double x[][Size], double y[][Size])
{
  for (int i = 0; i < Size; i++)
  {
    for (int j = 0; j < Size; j++)
    {
	  cout << x[i][j] << '\t' << y[i][j] << '\n';
    }
  }
}

[usmannazir]

@dutch
Thanks