Podcast
Questions and Answers
Smart contracts were first proposed in the 1990s as a digital form of promises.
Smart contracts were first proposed in the 1990s as a digital form of promises.
True (A)
Solidity is a dynamically-typed language designed for Ethereum.
Solidity is a dynamically-typed language designed for Ethereum.
False (B)
Solidity is also used by Binance Smart Chain, Avalanche, and XinFin.
Solidity is also used by Binance Smart Chain, Avalanche, and XinFin.
True (A)
The storage in the blockchain is permanent and expensive.
The storage in the blockchain is permanent and expensive.
Memory is a byte array with slot sizes of 32 bytes and is stored during function execution.
Memory is a byte array with slot sizes of 32 bytes and is stored during function execution.
Only 16 stack variables are accessible in the stack.
Only 16 stack variables are accessible in the stack.
Local variables of reference type in functions can only be stored in memory.
Local variables of reference type in functions can only be stored in memory.
Local variables of value types in functions are stored in the stack.
Local variables of value types in functions are stored in the stack.
Solidity is a Turing-complete language.
Solidity is a Turing-complete language.
Smart contracts are necessarily related to a contract.
Smart contracts are necessarily related to a contract.
Solidity functions marked as 'external' can only be called from within the contract itself
Solidity functions marked as 'external' can only be called from within the contract itself
Solidity functions marked as 'pure' cannot modify the contract's state
Solidity functions marked as 'pure' cannot modify the contract's state
The 'payable' keyword in Solidity allows a function to receive Ether when called
The 'payable' keyword in Solidity allows a function to receive Ether when called
The ERC-20 token standard is an example of a fungible token
The ERC-20 token standard is an example of a fungible token
ERC-721 tokens are non-fungible tokens (NFTs)
ERC-721 tokens are non-fungible tokens (NFTs)
The 'decimals' value in ERC-20 tokens specifies how many decimal places a token has
The 'decimals' value in ERC-20 tokens specifies how many decimal places a token has
The ERC-721 standard includes a function for minting new tokens
The ERC-721 standard includes a function for minting new tokens
The 'fallback' function in Solidity must be internal and pure
The 'fallback' function in Solidity must be internal and pure
ERC-1155 is an example of a multi-token standard in Ethereum
ERC-1155 is an example of a multi-token standard in Ethereum
The 'receive' function in Solidity must be external and payable
The 'receive' function in Solidity must be external and payable
Solidity functions marked as 'view' or 'pure' can modify the contract's state.
Solidity functions marked as 'view' or 'pure' can modify the contract's state.
ERC-721 tokens are fungible tokens.
ERC-721 tokens are fungible tokens.
The 'memory' in Solidity is stored permanently on the blockchain.
The 'memory' in Solidity is stored permanently on the blockchain.
Local variables of reference type in Solidity functions can only be stored in storage.
Local variables of reference type in Solidity functions can only be stored in storage.
Solidity is the only language designed for Ethereum smart contract development.
Solidity is the only language designed for Ethereum smart contract development.
ERC-1155 is a multi-token standard in Ethereum
ERC-1155 is a multi-token standard in Ethereum
The 'fallback' function in Solidity must be internal and pure
The 'fallback' function in Solidity must be internal and pure
Local variables of reference type in functions can only be stored in memory
Local variables of reference type in functions can only be stored in memory
The 'receive' function in Solidity must be external and payable
The 'receive' function in Solidity must be external and payable
Solidity is also used by Binance Smart Chain, Avalanche, and XinFin
Solidity is also used by Binance Smart Chain, Avalanche, and XinFin
Study Notes
Smart Contracts and Solidity
- Smart contracts were first proposed in the 1990s as a digital form of promises.
- Solidity is a dynamically-typed language designed for Ethereum, but also used by Binance Smart Chain, Avalanche, and XinFin.
Storage and Memory in Solidity
- Storage in the blockchain is permanent and expensive.
- Memory is a byte array with slot sizes of 32 bytes and is stored during function execution.
- Only 16 stack variables are accessible in the stack.
- Local variables of reference type in functions can only be stored in memory.
- Local variables of value types in functions are stored in the stack.
Solidity Language Features
- Solidity is a Turing-complete language.
- Functions marked as 'external' can only be called from within the contract itself.
- Functions marked as 'pure' cannot modify the contract's state.
- The 'payable' keyword allows a function to receive Ether when called.
- The 'view' function does not modify the contract's state.
- The 'fallback' function must be internal and pure.
- The 'receive' function must be external and payable.
Token Standards
- ERC-20 is an example of a fungible token standard.
- ERC-721 tokens are non-fungible tokens (NFTs).
- The 'decimals' value in ERC-20 tokens specifies how many decimal places a token has.
- The ERC-721 standard includes a function for minting new tokens.
- ERC-1155 is an example of a multi-token standard in Ethereum.
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Description
Test your knowledge of smart contracts, Solidity programming, token standards, and smart contract security with this quiz. Explore the basic structure of smart contracts, token standards like ERC20 and ERC721, and the lifecycle of smart contracts.
