Prime Distance 4

//PrimeDistances7a Looks at distance from each 1,3,7,9 (last digits of primes in list) to each of the 4 possibilities.
// eg given int ar[] = { 1, 3, 7, 9, 1, 1, 3, 3, 7, 7, 9, 9 } and looking at first 1 we see that the four distances are
// 4,1,2,3 from 1,3,7,9 respectively. Want to work out averages for each pair 1 to 1, 1 to 3 ....9 to 9. Should be more interesting than
// just random 1,3,7,9s...
//Works  12:43 PM 1/06/2019 as copied from onlinegdb.com But now need to expand last digit list up to a 10K file.
//First try a small file viz lastdigit100.txt that contains about 100 last prime digits. Going to create a function out of file: C:\Users\Dell\Documents\Primes\ReadFileIntoArray0
//Works OK but only 16 digits read in. Sat Jun  1 13:44:05 New Zealand Standard Time 2019
// Got this version to work. Primedist4.c with 100-digit text file of consec prime last digits. Outputs distance files for 1,3,7,9 in files like distFile7.txt for distances for 7-1, 7-3, 7-7, 7-9.
// Next try this program with larger files of last digits. Probably up to 10k long. Also use gawk etc to analise the data.

#include <stdio.h>
#include <stdlib.h>
//int ar[] = { 1, 3, 7, 9, 1, 1, 3, 3, 7, 7, 9, 9 };
int ar[1000] ;
int sz,numOfLastDigits;
int distances[10];
void showDistances(void);
void match1(int anchor);
void houseKeeping(void);
void windUp(void);
void writeDistances(int anch);
void readLastDigitsFileIntoArray(void);
int size;
int newDistCounter = 0;
FILE *fptr1,*f1,*f3,*f7,*f9, *myFile;

int main () {

  houseKeeping();
  readLastDigitsFileIntoArray();
//  int ar[numOfLastDigits];
//  size = sizeof (ar) / sizeof (ar[0]);
//  printf("\n sizeof(ar) is %d and sizeof(ar[0]) is %d \n ",sizeof(ar),sizeof(ar[0]));
size = numOfLastDigits;
printf("\n size = %d \n",size);
  for (int i =0;i<size-3;i++) {
      match1(i);
      showDistances();
      printf("-%d -",i);
  }
  return 0;
  windUp();
}


void match1(int anchor) {
    for(int l =0;l<10;l++) distances[l]=0;
    int i = anchor;
    int j = 1;
    newDistCounter=0;
    while ((i + j < size) && (newDistCounter<4) ){
        if (distances[ar[i + j]] == 0) {
            distances[ar[i + j]] = j;
            newDistCounter++;
        }
        j++;
    }
    writeDistances(ar[anchor]);
}

void showDistances(void) {
  for (int k = 0; k < 10; k++) {
      printf ("%d ", distances[k]); //init the places where distances will be recorded
  }
  printf(".....\n");
}

void writeDistances(int anch) {
    switch (anch) {
        case 1:
            fprintf(f1,"%d %d %d %d\n",distances[1],distances[3],distances[7],distances[9]);
            break;
        case 3:
            fprintf(f3,"%d %d %d %d\n",distances[1],distances[3],distances[7],distances[9]);
            break;
        case 7:
            fprintf(f7,"%d %d %d %d\n",distances[1],distances[3],distances[7],distances[9]);
            break;
        case 9:
            fprintf(f9,"%d %d %d %d\n",distances[1],distances[3],distances[7],distances[9]);
            break;
        default:
            printf("Not a prime\n");
    }
}

void houseKeeping(void) {
    int status;
    status = remove("distFile1.txt");
    f1 = fopen("distFile1.txt","a");
    status = remove("distFile3.txt");
    f3 = fopen("distFile3.txt","a");
    status = remove("distFile7.txt");
    f7 = fopen("distFile7.txt","a");
    status = remove("distFile9.txt");
    f9 = fopen("distFile9.txt","a");
}
void windUp(void) {
    fclose(f1);
    fclose(f3);
    fclose(f7);
    fclose(f9);
}
void readLastDigitsFileIntoArray(void) {


 //   FILE *myFile;
    myFile = fopen("lastdigit100A.txt", "r");
    printf("Starting to insert txt file into array called numberArray[] \n");
    fseek(myFile, 0L, SEEK_END);
    sz = ftell(myFile);
    numOfLastDigits = sz/3;
    rewind(myFile);
    printf("The size of file is: %d bytes\n ",sz);
    printf("So assuning number of last digits is: %d \n ",numOfLastDigits);
    //read file into array
    int big =16;
    int numberArray[sz];
    int i;


    if (myFile == NULL){
        printf("Error Reading File\n");
        exit (0);
    }

    for (i = 0; i < numOfLastDigits; i++){
        //for (i = 0; i < 16; i++){
        fscanf(myFile, "%d,", &numberArray[i] );
        printf(" %d %d \n", i,numberArray[i]);
    }

    /* for (i = 0; i < 16; i++){
        printf("Number is: %d\n\n", numberArray[i]);
    } */
    printf("done, index is %d \n",i);
    for (i=0;i< numOfLastDigits;i++) {
        //for (i=0;i< 10;i++) {
        ar[i] = numberArray[i];
        //ar[i] = numberArray[i];
    }
    fclose(myFile);

  //  return 0;
}