Initializing a simple empty binary file

#include<stdio.h>
#include<stdlib.h>
struct clientData
{
  int accountNum;
  char lastName[15];
  char firstName[10];
  double balance;
};
int main (void){
 FILE *cfPtr;
 int i;
 struct clientData client = {0, "", "", 0.0};
 if ((cfPtr=fopen("credit.dat", "wb")) == NULL){
   printf("File couled not be opened\n");
 }
 else {
   for(i=0;i<100;i++){
     printf("Initializing accountno %d\n",i);
     client.accountNum=i+1;
     fwrite(&client, sizeof (struct clientData), 1, cfPtr);
   }
   fclose(cfPtr);
 }

 return 0;
}