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whats the correct way of setting the totalSupply and why?

decimals = 18;
totalSupply = 10000

or

decimals = 18;
totalSupply = 10000 * (10 ** uint256(decimals));

Whats the correct way? What's the difference? What is (10 ** uint256(decimals)) actually doing?

Seems like the last option is the correct one, because if I dont use the second option, my tokens in Metamask connected to Ganache will show always 0 balance.

Also

10000 === 10000 * (10 ** uint256(decimals)) ?

Also another question, how can I call the methods transfer or transferFrom with a decimal value, sending 2.5 tokens for example? How would that be done, since the type is uint and I cant pass decimals.

2

The second way is correct. In Solidity, ** is the exponentiation operator, so 10 ** 18 is the same as 1018. So this:

uint256 totalSupply = 10000 * (10 ** uint256(decimals));

Means the total supply will be 10,000 × 1018 tokens. We use 10n because Solidity doesn´t (fully) support decimal numbers, only integers. In wallets, dApps, etc. this number is converted back to the actual balance with decimals.

To specify 2.5 tokens, for example, you would use 2.5 × 1018 (= 2,500,000,000,000,000,000) instead. You can reverse it by multiplying with 10-18 instead.

2
  • So, the supply is actually 10000, but its represented as 10,000 × 10^18 due to decimals, and the wallet apps make to divide the amount to display the correct supply of (10000). – redigaffi Apr 1 at 12:05
  • Yes, that´s correct. – Morten Apr 1 at 12:08

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