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Questions and Answers
ERC-20 tokens are non-fungible tokens (NFT)
False
View functions can modify states or call other non-view functions
False
Payable address can receive Ether
True
The fallback function must be external and payable
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ERC-721 is an extension of the ERC-20 interface
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Decimals are used to specify how many decimal places a token has
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ERC-1155 is a multi-token standard
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The receive function has no function keyword, no arguments, and no return values
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Event EVM logging facilities are used for ERC-20 tokens
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The total token supply is calculated as the displayed amount multiplied by 10^decimals
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Smart contracts were first proposed in the 1990s as a digital form of promises
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Solidity is designed for Ethereum and also used by Binance Smart Chain, Avalanche, XinFin
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Solidity is a dynamically-typed language
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Smart contract state variables of value types are stored in the stack
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Storage variables are written in the blockchain and stored permanently
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Local variables of reference types in a function are stored in memory or storage
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Solidity is a Turing-complete language
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The cost of storing data in the memory scales quadratically per operation
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Smart contracts can be modified after they are deployed
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The cost of storing data in the stack is cheaper than in memory or storage
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Study Notes
ERC Tokens
- ERC-20 tokens are not non-fungible tokens (NFT), they are a standard for fungible tokens.
- ERC-721 is an extension of the ERC-20 interface.
- ERC-1155 is a multi-token standard.
Function Types
- View functions cannot modify states or call other non-view functions.
- Payable address can receive Ether.
- The fallback function must be external and payable.
- The receive function has no function keyword, no arguments, and no return values.
Token Supply
- Decimals are used to specify how many decimal places a token has.
- The total token supply is calculated as the displayed amount multiplied by 10^decimals.
Smart Contracts
- Smart contracts were first proposed in the 1990s as a digital form of promises.
- Solidity is designed for Ethereum and also used by Binance Smart Chain, Avalanche, XinFin.
- Solidity is a dynamically-typed language.
- Solidity is a Turing-complete language.
Storage and Memory
- Smart contract state variables of value types are stored in the stack.
- Storage variables are written in the blockchain and stored permanently.
- Local variables of reference types in a function are stored in memory or storage.
- The cost of storing data in the stack is cheaper than in memory or storage.
- The cost of storing data in the memory scales quadratically per operation.
- Smart contracts cannot be modified after they are deployed.
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Description
Test your understanding of smart contracts, Solidity programming, token standards, and smart contract security with this quiz based on the principles of blockchains. Explore the basic structure of smart contracts, token standards like ERC20 and ERC721, and the lifecycle of smart contracts.
