struct stores                                                    
   {                                                                
        char  name[20];                                             
        float price;                                                
        int   quantity;                                             
   };                                                               
   main()                                                           
   {                                                                
        void update(struct stores *, float, int);                                              
        float         p_increment, value;                    
        int           q_increment;                                  
                                                                    
        struct stores item = {"XYZ", 25.75, 12};             
        struct stores *ptr = &item;                                 
                                                                    
        printf("\nInput increment values:");                        
        printf(" price increment and quantity increment\n");        
        scanf("%f %d", &p_increment, &q_increment);                 
                                                                    
   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - */
      
        update(&item, p_increment, q_increment);                    
   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - */
      
        printf("Updated values of item\n\n");                       
        printf("Name      : %s\n",ptr->name);                       
        printf("Price     : %f\n",ptr->price);                      
        printf("Quantity  : %d\n",ptr->quantity);                   
                                                                    
   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - */
value  = mul(&item);                                        
   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - */
      
        printf("\nValue of the item  =  %f\n", value);              
   }



   void update(struct stores *product, float p, int q)                                       
   {                                                                
        product->price += p;                                        
        product->quantity += q;                                     
   }                                                                
   float mul(struct stores *stock)                    
   {                                                                
        return(stock->price * stock->quantity);                     
   }                                                                
                                                                    
Output                                                           

   Input increment values: price increment and quantity increment   
   10 12                                                            
   Updated values of item                                           
                                                                    
   Name      : XYZ                                                  
   Price     : 35.750000                                            
   Quantity  : 24                                                   
                                                                    
   Value of the item  =  858.000000