Blockchain Developer Certification Practice 2025 - Free Blockchain Developer Practice Questions and Study Guide

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In Solidity, what happens if you don’t explicitly initialize a state variable?

It defaults to zero

In Solidity, if a state variable is not explicitly initialized, it defaults to zero. This is due to the behavior of Solidity and the Ethereum Virtual Machine (EVM), which ensures that all state variables have a default value. For different data types, this default value is specifically defined: for integer types, it defaults to 0; for booleans, it defaults to false; and for address types, it defaults to the zero address (0x0).

This built-in feature promotes security and predictability in smart contracts, as uninitialized variables will not have arbitrary values that could lead to unexpected behavior. This is particularly important in the context of blockchain, where reliability and consistency are paramount.

Understanding this behavior helps developers avoid common pitfalls associated with uninitialized variables, ensuring that they design and implement contracts that function as intended from the outset.

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It becomes null

It results in an error

Its value is undefined

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