Thread: Why can I not enter the last while loop?

/* The user is to enter a 9-digit social security number and check whether the number entered by the user is a valid SSN from a list of SSNs in a text file. */

Code:

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


int main()
{
int snn_num, user_ssn, ssn3, sum = 0;
    FILE * ssn;
    ssn = fopen("ssn_in.txt", "r");
 
    if (ssn == NULL ) {        // Checking if the file ssn_in.txt exists
    printf("The file ssn_in.txt does not exist\n");
    fclose(ssn);
    }
    
    else {
printf("The Social Security Numbers are:\n");
    while (fscanf(ssn, "%d", &snn_num) != EOF) {
sum = sum + 1;
printf("%d\n",snn_num);
    } 
}
 printf("Enter a 9-digit social security number: ");  // part 2
 scanf("%d", &user_ssn);
  
  


  
 if ((user_ssn <  100000000) || (user_ssn >= 1000000000)) // the input has to be  greater than and equal to 100000000 and less than 1000000000 or else exit program
     {
printf("The number (%d) you entered is not a valid 9-digit social security number.\n", user_ssn);
     return 0;
} 
  


  while (fscanf(ssn,"%d", &ssn3) != EOF) {   // if the input is within the range, the program will scan 
  
   if (user_ssn == ssn3 )
   printf("The SSN you entered (%d) is among the (%d) SSNs in the file ssn_in.txt", user_ssn, sum);
  
   else if (user_ssn != ssn3 )
   printf("The SSN you entered (%d) is NOT among the (%d) SSNs in the file ssn_in.txt", user_ssn, sum);
  }
  fclose(ssn);
}