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crowdsale.sol

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+pragma solidity ^0.4.0;
+import "./ERC20.sol";
+
+contract crowdsale is ERC20
+{
+    string standard="Token 1.0";
+    string name;
+    string symbols;
+   uint256 public totalsupply;
+   uint256  initialallowed;
+
+    mapping(address=>uint) public balanceOf;
+    mapping(address=>mapping(address=>uint256))public allowed;
+
+function newconcept()public{
+    totalsupply=10000;
+    balanceOf[msg.sender]=totalsupply;
+    symbols="NT";
+    initialallowed=5000;
+   }
+   function totalSupply()public view returns(uint256)
+   {
+       return totalsupply;
+   }
+   function transfer(address to, uint256 value)public returns(bool) {
+    require(value <= balanceOf[msg.sender]);
+    require(value <= allowed[msg.sender][to]);
+
+    balanceOf[msg.sender]=balanceOf[msg.sender]-(value);
+    balanceOf[to] =balanceOf[to]+(value);
+    //allowed[msg.sender][to] = allowed[msg.sender][to]-(value);
+    return true;
+  }
+
+
+function allowance(address owner, address to) public returns (uint256)
+{
+    allowed[owner][to]=initialallowed;
+    return allowed[owner][to];
+}
+    function balanceOf(address _owner)public view returns(uint256)
+{
+    return balanceOf[_owner];
+}
+function approve(address spender, uint256 value) public returns (bool)
+{
+    allowed[msg.sender][spender]=value;
+    return true;
+    }
+function transferFrom (address from, address to, uint256 value)public returns (bool)
+{
+    allowed[msg.sender][from]=initialallowed;
+    return true;
+}
+}