Virtual Labs

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

Advanced Smart Contract Writing

Choose difficulty:

Beginner

Intermediate

Advanced

How do you add a value to a dynamic array in Solidity?

a: Using the `push` function Explanation

Explanation

b: By assigning a value directly to an index Explanation

Explanation

c: By calling the `addValue` library Explanation

Explanation

d: By using the `insert` function Explanation

Explanation

Which of the following correctly initializes a struct in Solidity?

a: Person memory person = Person('Alice', 25); Explanation

Explanation

b: struct Person = Person('Alice', 25); Explanation

Explanation

c: Person public person = ('Alice', 25); Explanation

Explanation

d: Person public person = Person({name: 'Alice', age: 25}); Explanation

Explanation

What happens if you access a key in a mapping that doesn’t exist?

a: It throws an error. Explanation

Explanation

b: It returns the default value of the value type. Explanation

Explanation

c: It creates the key-value pair automatically. Explanation

Explanation

d: It removes the key from the mapping. Explanation

Explanation

Which feature of Remix IDE allows step-by-step execution of smart contracts to identify issues?

a: Compiler Explanation

Explanation

b: Debugger Explanation

Explanation

c: File Explorer Explanation

Explanation

d: Plugin Manager Explanation

Explanation

Which Solidity feature is used to group multiple related variables into one unit?

a: Mapping Explanation

Explanation

b: Array Explanation

Explanation

c: Struct Explanation

Explanation

d: Modifier Explanation

Explanation

Which of the following is NOT a feature of Solidity?

a: Static Typing Explanation

Explanation

b: Inheritance Explanation

Explanation

c: Event Logging Explanation

Explanation

d: Automatic Garbage Collection Explanation

Explanation

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