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

/*
 * http://www.daniweb.com/code/snippet278.html
 */
char *mygetline(char *line, int size)
{
   if ( fgets(line, size, stdin) )
   {
      char *newline = strchr(line, '\n'); /* check for trailing '\n' */
      if ( newline )
      {
         *newline =  '\0'; /* overwrite the '\n' with a terminating null */
      }
   }
   return line;
}

/*
 * http://www.daniweb.com/code/snippet266.html
 */
int mygeti(int *result)
{
   char buff [ 13 ]; /* signed 32-bit value, extra room for '\n' and '\0' */
   return fgets(buff, sizeof buff, stdin) && sscanf(buff, "%d", result) == 1;
}

struct record
{
   char name[30];
   int  age;
};

void record_write(const char *filename)
{
   FILE *file = fopen(filename, "ab"); /* append to the file in binary mode */
   if ( file != NULL )
   {
      struct record data;
      /*
       * Read a string from the user. Put it into the structure.
       */
      printf("Enter name: ");
      fflush(stdout);
      mygetline(data.name, sizeof data.name);
      /*
       * Read a string from the user. Put it into the structure.
       */
      do
      {
         printf("Enter age: ");
         fflush(stdout);
      } while ( !mygeti(&data.age) );
      /*
       * Write the data to the file.
       */
      fwrite(&data, sizeof data, 1, file);
      fclose(file);
   }
}

void record_readall(const char *filename)
{
   FILE *file = fopen(filename, "rb"); /* read from the file in binary mode */
   if ( file != NULL )
   {
      struct record data;
      while ( fread(&data, sizeof data, 1, file) == 1 ) /* read all records */
      {
         printf("%s,%d\n", data.name, data.age); /* print each */
      }
      fclose(file);
   }
}

int main()
{
   static const char filename[] = "output.dat";
   /*
    * Loop as long as the user wants to add records.
    */
   for ( ;; )
   {
      char line[10];
      fputs("Add record (Y/N)? ", stdout);
      fflush(stdout);
      mygetline(line, sizeof line);
      if ( tolower(*line) == 'n' )
      {
         break;
      }
      record_write(filename);
   }
   /*
    * Show all records in the file.
    */
   record_readall(filename);
   return 0;

}

/* my output
C:\Test>test
Add record (Y/N)? y
Enter name: Dave
Enter age: 35
Add record (Y/N)? N
Dave,35

C:\Test>test
Add record (Y/N)? Y
Enter name: Vlad
Enter age: 39
Add record (Y/N)? y
Enter name: Jose
Enter age: 32
Add record (Y/N)? n
Dave,35
Vlad,39
Jose,32

C:\Test>test
Add record (Y/N)? n
Dave,35
Vlad,39
Jose,32

C:\Test>test
Add record (Y/N)? y
Enter name: Bill
Enter age: four
Enter age: 
Enter age: 40
Add record (Y/N)? n
Dave,35
Vlad,39
Jose,32
Bill,40
*/