Token balance shows 0 in rinkeby etherscan - solidity

Question

I wrote a erc20 token contract and I deployed in rinkeby tetstnet. I given the toatl supply=1000000 but my token balance is showing 0 in metamask. How can I get the tokens and tell me the way to get the tokens. Below is my contract
pragma solidity ^0.5.0;
contract COCOTOKEN {
string public constant symbol = "COCO";
string public constant name = "COCOTOKEN";
uint8 public constant decimals = 18;
uint256 totalSupply = 1000000;
address public owner;
mapping(address => uint256) balances;
mapping(address => mapping (address => uint256)) allowed;
modifier onlyOwner {
require(msg.sender == owner);
_;
}
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
constructor() public{
owner = msg.sender;
balances[owner] = totalSupply;
}
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
function transfer(address _to, uint256 _amount) public returns (bool success) {
if (balances[msg.sender] >= _amount
&& _amount > 0
&& balances[_to] + _amount > balances[_to]) {
balances[msg.sender] -= _amount;
balances[_to] += _amount;
emit Transfer(msg.sender, _to, _amount);
return true;
} else {
return false;
}
}
function transferFrom(
address _from,
address _to,
uint256 _amount
) public returns (bool success) {
if (balances[_from] >= _amount
&& allowed[_from][msg.sender] >= _amount
&& _amount > 0
&& balances[_to] + _amount > balances[_to]) {
balances[_from] -= _amount;
allowed[_from][msg.sender] -= _amount;
balances[_to] += _amount;
emit Transfer(_from, _to, _amount);
return true;
} else {
return false;
}
}
function approve(address _spender, uint256 _amount) public returns (bool success) {
allowed[msg.sender][_spender] = _amount;
emit Approval(msg.sender, _spender, _amount);
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}
and the the deployed contract address is "0xc3384a37d041b99d437734a80e88b39e0efa630d".Why token balance is showing 0.In rinkeby etehrscan it showing liks following
On-chain Token Attributes Check Result:
Total Supply = 0
Name = COCOTOKEN
Symbol = COCO
Decimals = 18
ERC-165 Interface = {Not Available}
Implements ERC-721 = {Not Available}.
Can any one please tell me how to add tokens?

Answer 1

Because that is very small unit of your ether. just transfer for ether from faucet.
or just transfer in wei unit 1000000000000000000 then you will be see 1 ether on your screen.

Answer 2

You need to increase your totalSupply of with 18 digits of the decimal. for more explanation on decimal and totalSupply check this Answer.

Answer 3

The value that you assegned at the totalSupply is too low,you can check the erc20 token standard here. In the constructor they set the totalSupply like in the code below:
constructor() public {
symbol = "FIXED";
name = "Example Fixed Supply Token";
decimals = 18;
_totalSupply = 1000000 * 10**uint(decimals);
balances[owner] = _totalSupply;
emit Transfer(address(0), owner, _totalSupply);
}

Answer 4

The total supply you are giving is like totalsupply = 1000000 * 10^-18 which would come to 0.0000000000001 so obviously it will show as zero when you try to perform any transaction.

Answer 5

Here is a complete implementation using OpenZeppelin which sets total supply to 1000000 and assigns the tokens to you at contract initialization.
pragma solidity 0.5.2;
import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
contract TokenMock is ERC20
{
constructor () public {
_mint(msg.sender, 1000000);
}
}