APPENDING ITEMS TO AN EXISTING FILE USING DO WHILE LOOP

#include  <stdio.h>                                              

   struct invent_record                                             
   {
       char   name[10];                                             
       int    number;                                               
       float  price;                                                
       int    quantity;                                             
   };                                                               

   main()                                                           
   {
       struct invent_record item;                                   
       char  filename[10];                                          
       int   response;                                              
       FILE  *fp;                                                   
       long  n;                                                     
       void append (struct invent_record 8x, file *y);                                                             
       printf(\"Type filename:\");                                    
       scanf(\"%s\", filename);                                       

       fp = fopen(filename, \"a+\");                                  
       do                                                           
       {
          append(&item, fp);                                        
          printf(\"\\nItem %s appended.\\n\",item.name);                
          printf(\"\\nDo you want to add another item\\                
           (1 for YES /0 for NO)?\");                                        
          scanf(\"%d\", &response);                                   
       }  while (response == 1);                                    

       n = ftell(fp);      /* Position of last character  */        
       fclose(fp);                                                  

       fp = fopen(filename, \"r\");                                   








  while(ftell(fp) < n)                                         
       {                                                            
          fscanf(fp,\"%s %d %f %d\",                                  
          item.name, &item.number, &item.price, &item.quantity); 
          fprintf(stdout,\"%-8s %7d %8.2f %8d\\n\",                    
          item.name, item.number, item.price, item.quantity);    
       }                                                            
       fclose(fp);                                                  
   }                                                                
   void append(struct invent_record *product, File *ptr)
   {                                                                
       printf(\"Item name:\");                                        
       scanf(\"%s\", product->name);                                  
       printf(\"Item number:\");                                      
       scanf(\"%d\", &product->number);                               
       printf(\"Item price:\");                                       
       scanf(\"%f\", &product->price);                                
       printf(\"Quantity:\");                                         
       scanf(\"%d\", &product->quantity);                             
       fprintf(ptr, \"%s %d %.2f %d\",                                
                     product->name,                                 
                     product->number,                               
                     product->price,                                
                     product->quantity);                            
   }                                                                

Output                                                           
   Type filename:INVENTORY                                          
   Item name:XXX                                                    
   Item number:444                                                  
   Item price:40.50                                                 
   Quantity:34                                                      
   Item XXX appended.                                               
   Do you want to add another item(1 for YES /0 for NO)?1           
   Item name:YYY                                                    
   Item number:555                                                  
   Item price:50.50                                                 
   Quantity:45                                                      
   Item YYY appended.                                               
   Do you want to add another item(1 for YES /0 for NO)?0           
   AAA-1        111    17.50      115                               
   BBB-2        125    36.00       75                               
   C-3          247    31.75      104                               
   XXX          444    40.50       34                               
   YYY          555    50.50       45