reading table with chemical elements in structure

[Thierc1]

Hi

I am new to c and I try to write a script that reads chemical elements into a structure, write to a binary file, where the elements are classified according to the number in the third column. I should try to do that with fseek function.
I could write the elements into a structure in binary file, but don't succeed to classify on the 2nd column.

1. input file with element

Actinium Ac 89 227.0278
Aluminum Al 13 26.981539
Americium Am 95 243.0614
Antimony Sb 51 121.760
...
2. script

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


struct Element {


    char nom[44];
    char symbole[4];
    int numeroatomique;
    double masseatomique;
 };


typedef struct Element FICHE;


int main() {


    char line[300];
    FICHE element  = {"","",0,0};
    char nom[44];
    char symb[4];




    FILE *pf = NULL;
    FILE *mendelf;


    if ( ( pf = fopen ( "tabletriee.txt", "r")) == NULL) {
        printf ( "could not open file\n");
        return 1;
    }
    if ( ( mendelf = fopen( "elements.DAT", "wb")) == NULL) {
        printf ( "could not open file\n");
        return 1;
    }
    while ( ( fgets ( line, sizeof ( line), pf))) {
        if ( ( sscanf ( line, "%44s %4s %d %lf", element.nom, element.symbole, &element.numeroatomique, &element.masseatomique)) == 4) {


            fwrite(&element, sizeof(element), 1, mendelf);


        }
    }
    fclose (pf);
    fclose (mendelf);
    int rec;    
    mendelf = fopen("elements.DAT","rb");


    
    while(fread(&element,sizeof(element),1,mendelf))


     printf("%s\t%s\t%d\t%lf\n", element.nom, element.symbole, element.numeroatomique, element.masseatomique);            


            
   return 0;    
    
}

3. expected output

Aluminum Al 13 26.981539
Antimony Sb 51 121.760
Actinium Ac 89 227.0278
Americium Am 95 243.0614
Thanks for helping!!

[GReaper]

Why don't you save them all in an array, call qsort on it, and then output then to the binary file.

[Salem]

From the description, you need to do
fseek (sizeof(struct Element)*element.numeroatomique)

before each read or write.