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Update introduction-to-smart-contracts.rst
Updated link for pragma.
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@ -33,9 +33,9 @@ Storage
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The first line simply tells that the source code is written for
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Solidity version 0.4.0 or anything newer that does not break functionality
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(up to, but not including, version 0.5.0). This is to ensure that the
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contract does not suddenly behave differently with a new compiler version. For more information about pragma, see [here](https://en.wikipedia.org/wiki/Pragma_once).
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contract does not suddenly behave differently with a new compiler version. For more information about pragma, see [here](https://en.wikipedia.org/wiki/Directive_(programming)).
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A contract in the sense of Solidity is a collection of code (its [functions](https://en.wikipedia.org/wiki/Subroutine)) and
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A contract in the sense of Solidity is a collection of code (its *functions*) and
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data (its *state*) that resides at a specific address on the Ethereum
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blockchain. The line ``uint storedData;`` declares a state variable called ``storedData`` of
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type ``uint`` (unsigned integer of 256 bits). You can think of it as a single slot
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