Can someone help me please find the ploblem with this program ? I know it's a question of a misssing pointer but i don't know where to put it ..

#include<stdio.h>
void remplissage_matrix(char M[50][50],int l , int c);
void remplissage_elements(int l, int c ,char M[50][50],char elements[100],int *n);
void remplissage_histo(int histo[100],char elements[100],int *n);
int main()
{
    int l,c,n,m ;
    char M[50][50],elements[100];
    int histo[100];

     printf("Saisir le nombre des lignes de la matrice \n");
    scanf("%d",&l);

    printf("Saisir le nombre des colonnes de la matrice \n");
    scanf("%d",&c);

remplissage_matrix( M, l , c);
remplissage_elements(l,c,M,elements,&m);
remplissage_histo( histo,elements,&m);
return 0 ;
}
void remplissage_matrix(char M[50][50],int l , int c)
{
    int i,j,k,x=0,n;

    for (i=0;i<l;i++)
{
    for (j=0;j<c;j++)
{
    printf("Saisir M[%d][%d]",i,j);
    fflush(stdin);
    scanf("%c",&M[i][j]);

  }}
   for (i=0;i<l;i++)
     {
     for (j=0;j<c;j++)

     printf("M[%d,%d]= %c \n" ,i,j,M[i][j]);
  }

}
void remplissage_elements(int l, int c ,char M[50][50] ,char elements[100],int *n)
{
int i,j,k,x;

    for (i=0;i<l;i++)
    {
        for(j=0;j<c;j++)
        {
elements[x++]= M[i][j];
        }
    }
    *n= l * c;

    for(i=0; i < *n; i++)
   {
      for(j=i+1; j < *n; )
      {
         if(elements[j] == elements[i])
         {
            for(k=j; k < *n;k++)
            {
               elements[k] = elements[k+1];
            }
            *n--;
         }
         else {
            j++;
         }
      }
   }

   for(i=0; i < *n; i++)
   {
      printf("Elements[%d] est %c \n",i, elements[i]);
   }
   }

void remplissage_histo(int histo[100],char elements[100], int *n)
{
    int  i,j,x,count;
    for(i = 0; i < *n; i++) {
        count = 1;
        for(j = i+1; j < *n; j++) {
            if(elements[i]==elements[j]) {
               histo[j] = 0;
                count++;
            }
        }
        if(histo[i]!=0) {
            histo[i] = count;
        }
    }

    for(i = 0; i<*n; i++) {
        if(histo[i] != 0) {
            printf("Element %c : Count %d\n", elements[i], histo[i]);
        }
    }

    for(x = 0; x < *n; x++)
    {
         if( histo[x] > 0){
            printf("%c",&elements[x]);
            for(i = 1; i <= histo[x]; ++i){
                printf("*");
         }
         printf("\n");
         }
    }
    }

I agree a bit with rproffitt, but without actually running the code I noticed the following:

line 51 : elements[x++]= M[i][j]; x is not initialized. Might and might not start as 0.

line 64 elements[k] = elements[k+1]; In the first parse if elements[i] == elements [j] then this line sets elements[k] to be element[k+1] BUT the loop is for(k=j; k < *n;k++) which means that you have stepped passed the end of the array.

Beyond that I am not sure what you want the code to do -- so fix this simple stuff and if you can add an example of what the code should do and what it does do, e.g. for a 3x3 matrix or something small, that would help.

Edited 1 Month Ago by StuXYZ

Comments
Nice find. I have a story about uninitialized variables. Big money, adventures were had.