Solidity – What Does ** Mean?

solidity

I noticed this code in open zepplins contract:

  uint256 public constant INITIAL_SUPPLY = 10000 * (10 ** uint256(decimals));

I've never seen the double ** before. What does it mean?

Best Answer

from the solidity documentation :

Arithmetic operators: +, -, unary -, unary +, *, /, % (remainder), ** (exponentiation)

so : a**b is a to the power of b (i.e: a*a*a*...*a b times)

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Solidity – Handling Unimplemented Functions in Contracts

The problem is that totalSupply() implementation is missing. Seems like autogenerated getters do not count. So you need to explicitly create the function.

contract StandardToken is Token {
    uint256 _totalSupply;

    function totalSupply() constant returns (uint256 totalSupply) {
        totalSupply = _totalSupply;
    }
}

Best Answer

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