Thread: An array element changes its value for no reason

Hello,
I'm using C to write a user defined macro for the Ansys Fluent software. In a part of this macro, I read data from text files and store them in arrays , Here's the code:

Code:

DEFINE_EXECUTE_ON_LOADING(data_import,libname)  /*macro definition*/
{
    FILE *fp ;
    size_t i, j, k ;                                                       /*Array indexes*/
    char *tok1, *tok2, row[1000] ;
    
    /*First file*/
    fp=fopen("RCT.csv","r");
    i = 0;
    while (1)                                           /*Loop to read each line of characters*/
    {
        fgets(row,50,fp);
        if (feof(fp))                                   /*Breaks the loop if ENDOFFILE=TRUE*/
        {
            break;
        }
        tok1=strtok(row,",");
        j=0;
        while (tok1 != NULL)                             /*Loop to read tokens of each line*/
        {
            blade_d[i][j] = strtod(tok1,NULL);
            tok1 = strtok(NULL,",");
            j++;
        }
        i++;
    }


    fclose(fp);


    Message("\n %f\n", blade_d[0][0]) ;     /*A command to display messages*/


    /*Second and third file*/
    fp=fopen("Data_C_l.txt","r");
    for (k = 0; k < 2; k++)
    {
        
        i=0;
        while (1)
        {
            fgets(row,1000,fp);
            if (feof(fp))
            {
                break;
            }
            tok2=strtok(row," ");
            j=0;
            while (tok2 != NULL)
            {
                airfoil_d[k][i][j] = strtod(tok2,NULL);
                tok2 = strtok(NULL," ");
                j++;
            }
            i++;  
        }


        fclose(fp);
        fp = fopen("Data_C_d.txt","r");
    }


    fclose(fp);


    Message("\n %f\n", blade_d[0][0]) ;
}

Now, the problem is that the first element of "blade_d" array changes value from 0.25 (the correct one) to 0.0 . And this happens somewhere between the two "Message" commands. Since I'm pretty new to C language, I'm quite confused about why this is happening.
Any help is much appreciated.

p.s. "blade_d" and "airfoil_d" arrays are defined as global variables above macro definition.