What does a nested structure in C allow you to do?
- Create a structure inside another structure
- Define a function inside a structure
- Define a structure with no members
- Nest loops within a structure
In C programming, a nested structure allows you to create a structure inside another structure. This can be useful when you want to represent complex data structures, as it lets you organize related data even further, creating a hierarchical structure.
In C, if you want to ensure that all the data written to a file is physically stored, you can use the ______ function.
- fwrite()
- fflush()
- fseek()
- fsync()
The correct option is b) fflush(). This function flushes the output buffer, ensuring that all data is physically stored in the file.
Why would a developer use pointers to structures instead of using structures directly?
- To add complexity to the code
- To improve program performance
- To save memory
- To simplify the code
Developers use pointers to structures to improve program performance. When you use pointers, you can manipulate data more efficiently and avoid creating redundant copies of structures, leading to better memory and performance optimization. It simplifies code by allowing you to pass structures by reference and make changes directly to the original data. However, it can add complexity to the code, so careful usage is essential.
When defining a structure in C, which keyword is used?
- class
- define
- struct
- type
In C programming, the keyword "struct" is used to define a structure. The "struct" keyword is followed by the structure name, and within the curly braces, you define the structure members or fields.
What is the difference between an array and a pointer in the context of C programming?
- Arrays always start at index 0, but pointers can start at any index
- Arrays can be dereferenced, but pointers cannot
- Arrays can store multiple data types, while pointers can't
- Arrays have a fixed size, while pointers can be resized dynamically
Arrays have a fixed size once declared, whereas pointers can be resized dynamically to point to different memory locations. This flexibility makes pointers more versatile for dynamic data structures.
When a variable is passed by what, any changes made to the parameter inside the function do not affect the original value?
- Pointer
- Reference
- Type
- Value
When a variable is passed by value, a copy of the original value is created, and any changes made inside the function do not affect the original variable.
What is the significance of using pointers to arrays in C?
- Dynamic array sizing
- Efficient data manipulation
- Enhanced memory allocation
- Improved data retrieval
Pointers to Arrays in C provide an efficient way to manipulate data within arrays. They allow for direct memory access and can be used for efficient data processing.
To split a string into tokens in C, the function ________ is used.
- split
- strtok
- substring
- splitstr
The correct answer is strtok. strtok is a standard C function used to split a string into tokens. The other options are not valid C functions for this purpose.
The ________ keyword in C suggests to the compiler to use a CPU register for the variable to optimize access time.
- const
- register
- static
- volatile
The 'register' keyword in C suggests to the compiler to use a CPU register for the variable to optimize access time, which can lead to faster variable access.
What is a variable declared within a block or a function known as?
- Dynamic variable
- Local variable
- Private variable
- Public variable
A variable declared within a block or a function is known as a local variable, and its scope is limited to that specific block or function.