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. 2019 Jul 28;19(15):3319. doi: 10.3390/s19153319
Listing 1: Main code of the smart contract that controls GlucoCoin.
		pragma solidity >=0.4.25 <0.6.0;
		
		contract GlucoCoin {
		    mapping (address => uint) balances;
			
		    event Transfer(address indexed _from address indexed _to, uint256 _value);
			
		    constructor() public {
		            balances[tx.origin] = 10000;
		   
		    }
			
		    function sendCoin(address receiver, uint amount) public returns(bool sufficient) {
		            if (balances[msg.sender] < amount) return false;
		            balances[msg.sender] −= amount;
		            balances[receiver] += amount;
		            emit Transfer(msg.sender, receiver, amount);
		            return true;
		    }
		 
		    function getBalanceInEth(address addr) public view returns(uint) {
		            return ConvertLib.convert(getBalance(addr),2);
		    }
		 
		    function getBalance(address addr) public view returns(uint) {
		            return balances[addr];
		    }
	      }