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pragma solidity ^0.8.2;
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contract InstaGlobalPay {
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mapping(address => uint) public balances;
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mapping(address => mapping(address => uint)) public allowed;
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uint public totalSupply;
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string public name;
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string public symbol;
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uint public decimals;
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event Transfer(address indexed from, address indexed to, uint value);
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event Approval(address indexed owner, address indexed spender, uint value);
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constructor(string memory _name, string memory _symbol, uint _supply, uint _dec, address _owner) {
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name = _name;
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symbol = _symbol;
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decimals = _dec;
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totalSupply = _supply * 10 ** _dec;
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balances[_owner] = totalSupply;
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emit Transfer(address(0), _owner, totalSupply);
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}
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function balanceOf(address owner) public view returns(uint) {
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return balances[owner];
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}
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function transfer(address to, uint value) public returns(bool) {
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require(balanceOf(msg.sender) >= value, 'balance too low');
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balances[to] += value;
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balances[msg.sender] -= value;
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emit Transfer(msg.sender, to, value);
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return true;
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}
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function transferFrom(address from, address to, uint value) public returns(bool) {
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require(balanceOf(from) >= value, 'balance too low');
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require(allowed[from][msg.sender] >= value, 'allowance too low');
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balances[to] += value;
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balances[from] -= value;
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allowed[from][msg.sender] -=value;
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emit Transfer(from, to, value);
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return true;
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}
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function approve(address spender, uint value) public returns (bool) {
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allowed[msg.sender][spender] = value;
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emit Approval(msg.sender, spender, value);
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return true;
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}
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function allowance(address owner, address spender) public view returns (uint) {
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return allowed[owner][spender];
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}
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} |