Sorting Multiple Arrays with complications of 2D arrays and strings.

Hello,

I am having trouble with an assignment at college. Now, I don't want anyone to write the program for me. I just want to understand the concepts.

Problem Specification:
I have to get a list of names and data to go with those names from an infile, sort them and then print them to the screen. The program works until I get to the actual sorting. It is returning weird values and not sorting anything. If someone could tell me what's wrong with the sort function and explain the concepts I don't have right?

The code in question:

Code:

---

/*datalength is the number of entries from the datafile*/
void SortData (int datalength, char full [50][40], char last [50][20], char first [50][20], double fall [], double winter [], double spring [], double summer [], double total [])
{
        int i;
        int j;
        char chartemp [40];
        double doubletemp;
       
        char comma [2] = {","};
       
        /*Combines the last and first names into one array: full, and inserts a comma between them / Works*/
        for (i = 0; i < datalength; i++)
        {
                strcpy (full [i], last [i]);
                strcat (full [i], comma);
                strcat (full [i], first [i]);
        }
       
        /*The part that doesn't work, the lower variable value is giving weird or wrong answers*/
        for (i = 0; i < datalength; i++)
        {
                lowest = i;
                for (j = i + 1; j < datalength; j++)
                {
                        if (strcmp (full [j], full [lowest]) < 0);
                                lowest = j;
                        if (i != lowest)
                        {
                                strcpy (chartemp, full [j]);
                                strcpy (full [j], full [i]);
                                strcpy (full [i], chartemp);
                       
                                doubletemp = fall [j];
                                fall [j] = fall [i];
                                fall [i] = doubletemp;
                               
                                doubletemp = winter [j];
                                winter [j] = winter [i];
                                winter [i] = doubletemp;
                       
                                doubletemp = spring [j];
                                spring [j] = spring [i];
                                spring [i] = doubletemp;
                               
                                doubletemp = summer [j];
                                summer [j] = summer [i];
                                summer [i] = doubletemp;
                               
                                doubletemp = total [j];
                                total [j] = total [i];
                                total [i] = doubletemp;
                        }
                }
        }
}

---

A small part of the datafile looks like this:

Code:

---

Hill Justin 2785.00 2282.00 5720.00 6330.00
Ortego Taylor 4715.00 1676.00 6067.00 929.00
Stoilova Nadica 1253.00 1495.00 2884.00 4173.00

---

I don't understand the sorting concept in relation to the code.
Please help! :confused:

[Note: cross-posted. Replies have already been posted here.]

Standard C already has a great sorting function called qsort.

Code:

---

#include <stdlib.h>

void qsort( void* base
                , size_t nelem
                , size_t size
                , int (*cmp)(const void* e1, const void* e2)
              );

---

Hope that helps.