i don't succeed into making an array of 20 lines and 20 columns filled with zeros

Hi, i'm trying to make an array of 20 lines and 20 columns filled with zeros, but for now it is not working. Basically, it's an array initialized (filled with zeros), that is then displayed. Here's my code :

Code:

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#include <iostream>      // lectures et �critures (I/O)
#include <iomanip>        // manipulation des I/O, pas besoin pour le moment
#include <cstdlib>        // Bibliothèques C


using namespace std;


/****** Declarations globales ******/
// ========= constantes ========== //


// ============ types ============ //




// ========== variables ========== //


// ========== fonctions ========== //




float initialisation_grille()
{
  float grille[20][20];
  int ligne ; int colonne ;
  for ( ligne = 0 ; ligne <= 20 ; ligne ++ )
        {  for ( colonne  = 0 ; colonne < 20 ; colonne ++ )
                    {  grille [ ligne ] [ colonne ] = '0' ;
                        }


                }
return grille[20][20];
}




void affichage_grille ( float grille[20][20] ) { //grille est en entree car le SP doit connaitre
float toto[20][20];                                                                  // ses valeurs pour les afficher


 int ligne ;
 int colonne ;
 for ( ligne = 20; ligne >=0 ; ligne --){
                                            for ( colonne = 0 ; colonne <20; colonne ++ ){
                                            cout<< toto [ ligne ] [ colonne]<<'\t' ;
                                                    }
      cout << endl ;
    }
}




/*float donner_coefficients_table_de_routh__et_remplir_deux_premieres_lignes (  int x, int degre_denominateur ){
float y;
float t_tableaudecoefficients [25];
int c=0;
int l=0;
for (x=degre_denominateur ; x>=0 ; x--){
                                cout<<"quel est le coefficient associe au degre"<<x<<"?"<<endl;
                                cin>> y;
                                y = t_tableaudecoefficients[x];
                                if ( (l==2) ){ l=0 ; c++; }
                                        t_table2[l][c] = y;
                                        l++;
                              }
return y;
}


/*void effectuer_calcul_table_de_routh( float t_table2toto){
int ligne;
int i;
float t_table2[20][20];
    for (ligne=0 ; ligne<=20 ; ligne++){


                for (i=2 ; i<=20 ;i++ )  {
                                            int r;
                                            r=ligne-2;
                                            int s;
                                            s=ligne-1;
                                            int f;
                                            f=i+1;


                                            t_table2[ligne][i] = ( t_table2[r][f] - ( (t_table2[s][f]) * ( (t_table2[r][ligne])/(t_table2[s][ligne]) ) )  ) ;
                                          ;
                            }


    }


}


/*








/******* Programme principal *******/


int main(){
float tata[20][20];
initialisation_grille();
affichage_grille (tata);
cout<<"quel est le degre du denominateur ?"<<endl;
cout<<"toto"<<endl;
system("PAUSE");
//cout<<"quel est le degre du denominateur?"<<endl;
//cin>> degre_denominateur ;
//donner_coefficients_table_de_routh__et_remplir_deux_premieres_lignes ( x, degre_denominateur );
//effectuer_calcul_table_de_routh(t_table2 [20][20]);
//affichage_grille (t_table2 [20][20]);
//system("PAUSE");
}

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Any help would be appreciated

I take it that when you run your program, nothing is printed out, yes?

[edit]

Is this a homework assignment?

Not a lot of progress in two days.
http://cboard.cprogramming.com/cplus...ore-float.html

Except the code looks worse than ever.

Quote:

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Originally Posted by Salem

Not a lot of progress in two days.
http://cboard.cprogramming.com/cplus...ore-float.html

Except the code looks worse than ever.

---

Kinda hard to blame him, the language barrier (or lack of adequate instructional material in his native language) makes learning C++ that much more difficult.

I'll have to look at this at home.

Yes, I admit it's a shame. But i'm only looking for some improvement in c#, and i'm just beginning. To answer to ysg, when i run the program something is printed out, but it's not what i want :
what is displayed is an array filled mainly with 48 and for another part it's filled with some calculations.

i just do it as a training exercise, nothing for school, because as Salem said in other words, i need to improve in c#.
Thank you in advance for your help and your answers

Quote:

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Originally Posted by funnydarkvador

Yes, I admit it's a shame. But i'm only looking for some improvement in c#, and i'm just beginning. To answer to ysg, when i run the program something is printed out, but it's not what i want :
what is displayed is an array filled mainly with 48 and for another part it's filled with some calculations.

i just do it as a training exercise, nothing for school, because as Salem said in other words, i need to improve in c#.
Thank you in advance for your help and your answers

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If you want to improve in C#, why are you writing C++ code?

Sorry, in C++ i meant

funnydarkvador, here is a free/open source IDE that you can use for C# development (very easy to setup, has an install wizard):
SharpDevelop @ic#code

Here are two tutorials to get you started:
- Tutorial Contents
- C# Tutorials (C#)

Good luck :) .

My aim is just to create two functionsin my program :


-the first that we could call« initialization » that fills an array of 20 lines and 20columns with zeros
-the second that we could call« display » that just displays the array initialized


i want my function display to be thenused in my program for any other array that i want to be displayed inmy program (by passing it as a parameter).

i meant C++, but thank you nevertheless ysg, i'm also interested in C#

You can give me an example in english of what i want to do ( the two functions which i was telling you about in this thread), i perfectly understand english

Please i need help !! It must be easy when you are an informed programmer, but to create these two functions, i've been trying plenty of things that didnt' work

Quote:

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Originally Posted by funnydarkvador

Please i need help !! It must be easy when you are an informed programmer, but to create these two functions, i've been trying plenty of things that didnt' work

---

Calm down. I did 50% of it for you.

Code:

---

/**
 * four-hundred-zeroes.cpp:
 */
#include <iostream>

void initArray(int largeArray[20][20])
{
    for (int x = 0; x < 20; x++)
    {
        for (int y = 0; y < 20; y++)
        {
            largeArray[x][y] = 0;
        }
    }
}

void printOutArray(int largeArray[20][20])
{
}

int main(int argc, char * argv[])
{
    int largeArray[20][20];
    initArray(largeArray);
    printOutArray(largeArray);

    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
    std::cin.get();

    return 0;
}

---

You'll have to develop the print method. It's easy and you should be done with it relatively quickly.

Thank you very much !! I'm trying right now to finish it

If you're having trouble with something like that, I propose you run through a tutorial or a good C++ book.

You'll need a better grasp of the language and how the underlying info flows in order to continue to
advance.