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Contract Source Code:
File 1 of 1 : Token
pragma solidity ^0.5.0; contract Token { // Track how many tokens are owned by each address. mapping (address => uint256) public balanceOf; // Modify this section string public name = "SmartKey"; string public symbol = "Skey"; uint8 public decimals = 8; uint256 public totalSupply = 1000000000 * (uint256(10) ** decimals); event Transfer(address indexed from, address indexed to, uint256 value); constructor() public { // Initially assign all tokens to the contract's creator. balanceOf[msg.sender] = totalSupply; emit Transfer(address(0), msg.sender, totalSupply); } function transfer(address to, uint256 value) public returns (bool success) { require(balanceOf[msg.sender] >= value); balanceOf[msg.sender] -= value; // deduct from sender's balance balanceOf[to] += value; // add to recipient's balance emit Transfer(msg.sender, to, value); return true; } event Approval(address indexed owner, address indexed spender, uint256 value); mapping(address => mapping(address => uint256)) public allowance; function approve(address spender, uint256 value) public returns (bool success) { allowance[msg.sender][spender] = value; emit Approval(msg.sender, spender, value); return true; } function transferFrom(address from, address to, uint256 value) public returns (bool success) { require(value <= balanceOf[from]); require(value <= allowance[from][msg.sender]); balanceOf[from] -= value; balanceOf[to] += value; allowance[from][msg.sender] -= value; emit Transfer(from, to, value); return true; } }
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