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Inventory.sol

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+ pragma solidity ^0.4.0;
+
+import "./Newtoken.sol";
+
+ contract inventory is ERC20
+ {
+     address owner;
+     uint256 count=0;
+     uint256 token;
+
+     function inventory(){
+         owner=msg.sender;
+     }
+
+
+     struct admin{
+             uint pid;
+             uint updateproducts;
+             string msgalert;
+                }
+
+      struct products
+      {
+          string productname;
+          uint productid;
+          uint available;
+          uint amount;
+      }
+
+       modifier onlyowner()
+   {
+    require(msg.sender==owner);
+    _;
+   }
+
+      struct customer{
+          uint baln;
+          uint totalproducts;
+          uint totalprice; 
+      }
+     mapping(uint=>admin) proupdate;
+     mapping(uint=>products) product;
+     mapping(uint=>customer) customers;
+
+     function adm(uint _pid,uint updateproducts,string msgalert)public returns(bytes){
+         proupdate[_pid].updateproducts=updateproducts;
+         proupdate[_pid].msgalert=msgalert;
+         {
+          if(count<5)
+           {
+           return "msgalert";
+           }
+           else
+           {
+               return "updateproducts";
+           }
+         }
+     }
+   function setproducts(uint id,string productname,uint productid,uint count,uint amount)public
+     {
+         product[id].productname=productname;
+         product[id].productid=productid;
+         product[id].available=count;
+         product[id].amount=amount;
+     }
+     function avai(uint _id,uint productids) public view returns(bool)
+     {
+
+         if( product[_id].available>0  && productids==product[_id].productid)
+         {
+         return true;
+         }
+         else{
+             return false;
+         }
+         }
+
+
+      function buy(uint id,uint totalproducts,uint totalprice)public returns(bytes) 
+      {
+          customers[id].totalproducts++;
+          customers[id].totalprice=totalprice;
+
+          product[id].available=product[id].available-1;
+         transfer (owner,totalprice);
+            return "buy";
+      }
+      function aaa()public payable
+      {
+          uint256 rate=0.1 ether;
+          uint256 tokens;
+            tokens=msg.value/rate;
+             require(tokens<=balances[owner]);
+             owner.transfer(msg.value);
+             balances[msg.sender]=balances[msg.sender]+tokens;
+             balances[owner]-=tokens;
+             //balances[owner]=balances[owner]-token;
+             //transfer(owner,tokens);*/
+       }
+    }