What is the initial value of Ethereum contract variables?

Question

I make some contracts code with mapping data. When I first access data value, ethereum returns 0.

Is it specification of ethereum? In other word, Can I write a contract on the assumption that variable's initial value is 0?

Worden

Possible duplicate of Are there null like thing in solidity. See also this, this and this over at Ethereum Stack Exchange. – Bistoury

Answer 1

Yes, this is the default behavior. Each types have a "zero-state" default value. For example boolean have a default value of false, integer a default value of 0 and strings a default value of ""

You can read more here http://solidity.readthedocs.io/en/develop/control-structures.html#default-value

Seneca