Type checking and type systems(MCQs)

What is type checking in programming languages? a) Verifying that operations are performed on compatible data types b) Checking for syntax errors in the code c) Generating machine code from source code d) Optimizing code for performance Answer: a) Verifying that operations are performed on compatible data types What is a type system in programming languages? a) A set of rules that assign types to various constructs in a program b) A mechanism for optimizing code execution c) A tool for syntax checking d) A method for code generation Answer: a) A set of rules that assign types to various constructs in a program Which of the following is a static type system characteristic? a) Type checking is performed at compile time b) Type checking is performed at runtime c) Types are inferred dynamically d) Types are assigned during execution Answer: a) Type checking is performed at compile time Which of the following is a dynamic type system characteristic? a) Type checking is performed at runtime b) Type checking is performed at compile time c) Types are assigned statically d) Types are fixed and cannot change during execution Answer: a) Type checking is performed at runtime What is strong typing in a type system? a) The type system enforces strict rules on type compatibility and conversions b) The type system allows implicit type conversions between any types c) The type system performs type checking only at runtime d) The type system ignores type errors during compilation Answer: a) The type system enforces strict rules on type compatibility and conversions What is weak typing in a type system? a) The type system allows implicit type conversions and may not enforce strict type rules b) The type system enforces strict rules on type compatibility c) The type system performs type checking only at compile time d) The type system rejects all type errors Answer: a) The type system allows implicit type conversions and may not enforce strict type rules Which of the following is an example of a statically typed language? a) C++ b) Python c) JavaScript d) Ruby Answer: a) C++ Which of the following is an example of a dynamically typed language? a) Python b) C# c) Java d) Swift Answer: a) Python What is type inference? a) Automatically deducing the type of an expression based on the context b) Explicitly declaring types for all variables c) Converting types manually d) Enforcing strict type rules during compilation Answer: a) Automatically deducing the type of an expression based on the context What does polymorphism in type systems refer to? a) The ability to process different types using a uniform interface b) The restriction of type compatibility to a single type c) The automatic conversion of types d) The exclusion of type checks Answer: a) The ability to process different types using a uniform interface Which of the following best describes “type coercion”? a) Implicit conversion of types by the compiler or interpreter b) Explicitly defining types for variables c) Enforcing strict type rules d) Performing type checks only at runtime Answer: a) Implicit conversion of types by the compiler or interpreter What is “type safety”? a) Ensuring that operations are performed on compatible types and preventing type errors b) Allowing implicit type conversions c) Ignoring type errors during compilation d) Performing type checks only at runtime Answer: a) Ensuring that operations are performed on compatible types and preventing type errors What does “type checking” ensure in a programming language? a) That operations are performed on compatible types and that type rules are followed b) That syntax errors are present in the code c) That code is optimized for performance d) That machine code is generated correctly Answer: a) That operations are performed on compatible types and that type rules are followed Which of the following is a common type system feature in object-oriented languages? a) Type inheritance b) Type coercion c) Type erasure d) Type inference Answer: a) Type inheritance What is “type erasure”? a) Removing type information at compile time to simplify runtime operations b) Explicitly defining types for variables c) Enforcing strict type rules during compilation d) Performing type checks only at runtime Answer: a) Removing type information at compile time to simplify runtime operations Which of the following best describes “type constraints”? a) Restrictions on the types that can be used in certain contexts b) Allowing any type to be used without restrictions c) Ignoring type errors during compilation d) Automatically converting types Answer: a) Restrictions on the types that can be used in certain contexts What is “subtyping” in type systems? a) The ability of a type to be a subtype of another type, allowing for more specific operations b) The restriction of a type to a single type only c) The automatic conversion of types d) The exclusion of type checks Answer: a) The ability of a type to be a subtype of another type, allowing for more specific operations Which type system feature allows for functions to accept arguments of different types? a) Function overloading b) Type coercion c) Type erasure d) Type inference Answer: a) Function overloading What is “type unification”? a) The process of determining a common type for different types in type inference b) Explicitly declaring types for variables c) Enforcing strict type rules during compilation d) Performing type checks only at runtime Answer: a) The process of determining a common type for different types in type inference What is a “type signature”? a) The declaration of a function’s return type and parameter types b) The implicit conversion of types c) The automatic determination of types d) The removal of type information at compile time Answer: a) The declaration of a function’s return type and parameter types Which of the following is a benefit of strong typing? a) Reduces the likelihood of type errors and improves program reliability b) Allows for more implicit type conversions c) Simplifies type inference d) Facilitates runtime type checking Answer: a) Reduces the likelihood of type errors and improves program reliability Which type system concept allows a function to return different types based on its inputs? a) Generics b) Type coercion c) Type erasure d) Type inference Answer: a) Generics What is a “type alias”? a) A new name for an existing type, allowing for more readable code b) A mechanism for automatic type conversion c) A feature for enforcing type constraints d) A method for type erasure Answer: a) A new name for an existing type, allowing for more readable code What does “type compatibility” refer to? a) The ability of types to be used interchangeably in expressions or functions b) The enforcement of strict type rules c) The automatic determination of types d) The removal of type information at compile time Answer: a) The ability of types to be used interchangeably in expressions or functions Which of the following is true about “duck typing”? a) A type system concept where type compatibility is determined by whether an object behaves like the expected type b) A system that enforces strict type constraints c) A mechanism for type erasure d) A method for type inference Answer: a) A type system concept where type compatibility is determined by whether an object behaves like the expected type What is “type coercion”? a) Implicit conversion of types by the compiler or interpreter b) Explicitly declaring types for variables c) Enforcing strict type rules during compilation d) Performing type checks only at runtime Answer: a) Implicit conversion of types by the compiler or interpreter Which type of typing allows a variable to hold values of multiple types? a) Union types b) Generics c) Type inference d) Type coercion Answer: a) Union types What is a “type system” used for in a programming language? a) To define rules for assigning types to variables and expressions b) To optimize code execution c) To check for syntax errors d) To generate machine code Answer: a) To define rules for assigning types to variables and expressions Which of the following is an advantage of a static type system? a) Type errors are detected at compile time b) Type errors are detected at runtime c) Implicit type conversions are allowed d) Types are inferred dynamically Answer: a) Type errors are detected at compile time What is “type inference”? a) Automatically deducing the type of an expression from its context b) Explicitly defining types for all variables c) Converting types manually d) Enforcing strict type rules during compilation Answer: a) Automatically deducing the type of an expression from its context Which of the following describes “parametric polymorphism”? a) The ability to write functions or types that are parameterized by types b) The automatic conversion of types c) The restriction of types to a single type only d) The exclusion of type checks Answer: a) The ability to write functions or types that are parameterized by types What is the purpose of a “type checker”? a) To verify that types are used correctly and according to the type rules b) To generate machine code c) To optimize code execution d) To check for syntax errors Answer: a) To verify that types are used correctly and according to the type rules Which type of typing allows operations on different types through a common interface? a) Polymorphism b) Type coercion c) Type erasure d) Type inference Answer: a) Polymorphism What is “type abstraction”? a) Hiding the implementation details of types while exposing a uniform interface b) Explicitly defining types for variables c) Enforcing strict type rules during compilation d) Removing type information at compile time Answer: a) Hiding the implementation details of types while exposing a uniform interface Which concept allows a type to be a subtype of another type? a) Subtyping b) Type coercion c) Type inference d) Type erasure Answer: a) Subtyping What is “type checking” primarily concerned with? a) Ensuring that type rules are followed and operations are performed on compatible types b) Generating machine code from source code c) Optimizing code execution d) Checking for syntax errors Answer: a) Ensuring that type rules are followed and operations are performed on compatible types Which of the following languages uses a strong static type system? a) Java b) JavaScript c) Python d) Ruby Answer: a) Java What does “type polymorphism” allow in programming? a) The ability to write code that works with multiple types through a common interface b) The automatic conversion of types c) The restriction of types to a single type only d) The exclusion of type checks Answer: a) The ability to write code that works with multiple types through a common interface What is a “type system” feature that supports the use of different types interchangeably? a) Type compatibility b) Type erasure c) Type coercion d) Type inference Answer: a) Type compatibility Which of the following best describes “type safety”? a) Ensuring that type rules are enforced and preventing type errors b) Allowing implicit type conversions c) Ignoring type errors during compilation d) Performing type checks only at runtime Answer: a) Ensuring that type rules are enforced and preventing type errors Which feature of type systems helps in writing reusable code? a) Generics b) Type coercion c) Type erasure d) Type inference Answer: a) Generics What is “type coercion”? a) Implicit conversion of types by the compiler or interpreter b) Explicitly defining types for variables c) Enforcing strict type rules d) Performing type checks only at runtime Answer: a) Implicit conversion of types by the compiler or interpreter What is the advantage of using a strongly typed language? a) It reduces the likelihood of type errors and improves program reliability b) It allows for more implicit type conversions c) It simplifies type inference d) It facilitates runtime type checking Answer: a) It reduces the likelihood of type errors and improves program reliability Which feature of a type system allows variables to hold values of different types? a) Union types b) Generics c) Type inference d) Type coercion Answer: a) Union types What is “parametric polymorphism”? a) The ability to define functions and types that are parameterized by types b) The automatic conversion of types c) The restriction of types to a single type only d) The exclusion of type checks Answer: a) The ability to define functions and types that are parameterized by types What does “type inference” involve? a) Automatically determining the type of an expression based on its usage b) Explicitly declaring types for all variables c) Converting types manually d) Enforcing strict type rules during compilation Answer: a) Automatically determining the type of an expression based on its usage What is the role of “type constraints” in generic programming? a) To specify the types that can be used with generic functions or types b) To automatically convert types c) To enforce strict type rules d) To remove type information at compile time Answer: a) To specify the types that can be used with generic functions or types What is “type abstraction”? a) Hiding implementation details while exposing a uniform interface b) Explicitly defining types for variables c) Enforcing strict type rules during compilation d) Removing type information at compile time Answer: a) Hiding implementation details while exposing a uniform interface Which of the following describes “duck typing”? a) Determining type compatibility based on whether an object behaves like the expected type b) Enforcing strict type constraints c) Implementing type erasure d) Inferring types from context Answer: a) Determining type compatibility based on whether an object behaves like the expected type What is a “type alias” used for in programming? a) Providing a new name for an existing type to improve code readability b) Automatically converting types c) Enforcing type constraints d) Removing type information at compile time Answer: a) Providing a new name for an existing type to improve code readability