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Contract Source Code:
File 1 of 1 : MBCC
/** *Submitted for verification at Etherscan.io on 2019-01-31 */ pragma solidity ^0.4.8; /** * Math operations with safety checks */ contract SafeMath { function safeMul(uint256 a, uint256 b) internal returns (uint256) { uint256 c = a * b; assert(a == 0 || c / a == b); return c; } function safeDiv(uint256 a, uint256 b) internal returns (uint256) { assert(b > 0); uint256 c = a / b; assert(a == b * c + a % b); return c; } function safeSub(uint256 a, uint256 b) internal returns (uint256) { assert(b <= a); return a - b; } function safeAdd(uint256 a, uint256 b) internal returns (uint256) { uint256 c = a + b; assert(c>=a && c>=b); return c; } function assert(bool assertion) internal { if (!assertion) { throw; } } } contract MBCC is SafeMath{ string public name; string public symbol; uint8 public decimals; uint256 public totalSupply; address public owner; /* This creates an array with all balances */ mapping (address => uint256) public balanceOf; mapping (address => mapping (address => uint256)) public allowance; /* This generates a public event on the blockchain that will notify clients */ event Transfer(address indexed from, address indexed to, uint256 value); /* Initializes contract with initial supply tokens to the creator of the contract */ function MBCC() { balanceOf[msg.sender] = 58000000000000000; // Give the creator all initial tokens totalSupply = 58000000000000000; // Update total supply name = "magic box"; // Set the name for display purposes symbol = 'MBCC'; // Set the symbol for display purposes decimals = 8; // Amount of decimals for display purposes owner = msg.sender; } /* Send coins */ function transfer(address _to, uint256 _value) { if (_to == 0x0) throw; // Prevent transfer to 0x0 address. if (_value <= 0) throw; if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient Transfer(msg.sender, _to, _value); // Notify anyone listening that this transfer took place } /* Allow another contract to spend some tokens in your behalf */ function approve(address _spender, uint256 _value) returns (bool success) { if (_value <= 0) throw; allowance[msg.sender][_spender] = _value; return true; } /* A contract attempts to get the coins */ function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { if (_to == 0x0) throw; // Prevent transfer to 0x0 address. if (_value <= 0) throw; if (balanceOf[_from] < _value) throw; // Check if the sender has enough if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows if (_value > allowance[_from][msg.sender]) throw; // Check allowance balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value); // Subtract from the sender balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient allowance[_from][msg.sender] = SafeMath.safeSub(allowance[_from][msg.sender], _value); Transfer(_from, _to, _value); return true; } }
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