contract.sol

pragma solidity ^0.4.0; 

contract myico {
	address public admin; 
    mapping(address => uint) balance; 
    uint public initial_supply = 1000000;
    string public tokenName = "ICO";
    
	function myico() public{
		admin = msg.sender;
	}
	
	modifier admin_only(){
	    require(admin == msg.sender);
	    _;
	}
	
	function printMoreMoney(uint x) admin_only public{
	    initial_supply += x;
	    warningUsers(msg.sender, "is printing ...", x);
	}
	
	event warningUsers(address, string, uint);

    function givemeyourmoney() public payable{
     uint tempValue = (msg.value  / 1 ether); 
     require(msg.value >= 1 ether);
     require(initial_supply >= tempValue);
     initial_supply -=  tempValue;
     balance[msg.sender] += tempValue; 
    }

    function coinbalance() constant public returns(uint){
        return balance[msg.sender];
    }
    
    function contractBalance() constant public returns(uint){
        require(admin == msg.sender);
        return this.balance;
    }
}