error : expected primary-expression before ']' token

This is a discussion on error : expected primary-expression before ']' token within the C++ Programming forums, part of the General Programming Boards category; Hi I'm getting this error when I comipile this code : Code: #include <iostream> // lectures et �critures (I/O) #include ...

  1. #1
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    error : expected primary-expression before ']' token

    Hi I'm getting this error when I comipile this code :

    Code:
    #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 ============ //
    int degre_denominateur,x,y;
    float t_table2[20][20];
    
    
    // ========== variables ========== //
    
    
    // ========== fonctions ========== //
    
    
    void 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' ;
                            }
    
    
                    }
    }
    
    
    
    
    void affichage_grille ( float grilletest[][20]) { //grille est en entree car le SP doit connaitre
     float grille[20][20];                                       // ses valeurs pour les afficher
     int ligne ;
     int colonne ;
     for ( ligne = 20; ligne >=0 ; ligne --){
          for ( colonne = 0 ; colonne <= 20; colonne ++ ){
              cout<< grille [ 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[][20]){
    int ligne;
    int c;
    int i;
    float t_table2[20][20];
        for (ligne=0 ; ligne<=20 ; ligne++){
                    int p;
                    p=c+2;
                    for (i=2 ; i<=p ;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(){
    
    
    initialisation_grille();
    affichage_grille ( t_table2[][20] );
    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]);
    affichage_grille (t_table2[][20]);
    system("PAUSE");
    }
    Any help would be appreciated.

  2. #2
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    At lines 117, 121, and 122

  3. #3
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    Ignoring that this is C++ and not C... when you pass an entire array as an argument to a function, you pass the name only - no brackets.

  4. #4
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    cannot convert 'float (*)[20]' to 'float' for argument '1' to 'void eff..(float)'

    Quote Originally Posted by Tclausex View Post
    Ignoring that this is C++ and not C... when you pass an entire array as an argument to a function, you pass the name only - no brackets.
    Ok, thank you very much,
    now i removed the brackets and i get this error when i compile :
    cannot convert 'float (*)[20]' to 'float' for argument '1' to 'void effectuer_calcul_table_de_routh(float)'

    Code:
    #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 ============ //
    int degre_denominateur,x,y;
    float t_table2[20][20];
    
    
    // ========== variables ========== //
    
    
    // ========== fonctions ========== //
    
    
    void 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' ;
                            }
    
    
                    }
    }
    
    
    
    
    void affichage_grille ( float grilletest ) { //grille est en entree car le SP doit connaitre
     float grille[20][20];                                       // ses valeurs pour les afficher
     int ligne ;
     int colonne ;
     for ( ligne = 20; ligne >=0 ; ligne --){
          for ( colonne = 0 ; colonne <= 20; colonne ++ ){
              cout<< grille [ 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 c;
    int i;
    float t_table2[20][20];
        for (ligne=0 ; ligne<=20 ; ligne++){
                    int p;
                    p=c+2;
                    for (i=2 ; i<=p ;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(){
    
    
    initialisation_grille();
    affichage_grille ( t_table2 );
    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);
    affichage_grille (t_table2 );
    system("PAUSE");
    }

  5. #5
    SAMARAS std10093's Avatar
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    I knew that this was about to happen. What Tclausex wants to say, but is not at all specific, is that when calling the function, you should not use the brackets, but in the prototype of the function, you need them.

    Code:
    #include <stdio.h>
    
    void print(int array[], int n);
    
    int main(void)
    {
        int array[5] = {0};
        
        print(array, 5);
        
        return 0;
    }
    
    void print(int array[], int n)
    {
        int i;
        for(i = 0 ; i < n ; i++)
            printf("%d\n", array[i]);
    }
    Notice, that this forum has a thread for C++, so next time post C++ code in the c++ thread.
    Code - functions and small libraries I use


    It’s 2014 and I still use printf() for debugging.


    "Programs must be written for people to read, and only incidentally for machines to execute. " —Harold Abelson

  6. #6
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    Ok thank you very much for your help, now it works. Ok next time i will post the c++ thread.

  7. #7
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    I was pretty specific. I said nothing about changing the function parameters. But on looking closer, you're not even using the parameters in the functions
    Code:
    void affichage_grille ( float grilletest[][20]) { //grille est en entree car le SP doit connaitre
     float grille[20][20];                                       // ses valeurs pour les afficher
     int ligne ;
     int colonne ;
     for ( ligne = 20; ligne >=0 ; ligne --){
          for ( colonne = 0 ; colonne <= 20; colonne ++ ){
              cout<< grille [ ligne ] [ colonne]<< '\t';
          }
          cout << endl ;
        }
    }


    grilletest is un-used - so why pass the argument?


  8. #8
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    you're right, i've got to pass no argument and remove grilletest which is unused

  9. #9
    TEIAM - problem solved
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    Melbourne Australia
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    Can the mods move this to the c++ thread?
    Fact - Beethoven wrote his first symphony in C

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