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.
You are designing a C program to handle a database of employees in a company. Each employee has attributes like name, ID, and salary. What would be an efficient way to manage this data?
- Array of Structures
- Linked List of Structures
- Queue
- Stack
An array of structures would be an efficient way to manage data about employees in a company. This data structure allows for easy access and manipulation of employee records, making it suitable for tasks like searching for specific employees or sorting employees by various attributes.
In the context of bit fields, if the declared width is larger than the width of the specified type, the behavior is considered ________.
- Compilation error
- Overflow
- Undefined
- Well-defined
If the declared width of a bit field is larger than the width of the specified type, the behavior is undefined in C and C++. This means that the result may vary depending on the compiler and platform.
The use of inline functions can potentially lead to faster execution time but may also increase the ________ of the binary.
- Complexity
- Efficiency
- Size
- Speed
Inline functions can optimize execution time by eliminating the function call overhead. However, they may increase binary complexity due to code expansion, making the binary larger.
When a pointer is incremented, it moves to the memory address of the next element based on the ________ of the data type it points to.
- Color
- Name
- Shape
- Size
Pointer incrementation in C is determined by the size (in bytes) of the data type it points to.
You're optimizing a program for memory usage. What considerations would you take into account when deciding between using character arrays and string literals?
- Character arrays consume less memory than string literals, making them a better choice for memory optimization.
- Character arrays provide better performance due to reduced memory overhead.
- String literals are less efficient in terms of memory usage compared to character arrays.
- String literals are more memory-efficient, as they share storage and avoid duplicating string data.
When optimizing a program for memory usage, you would consider using character arrays over string literals because character arrays generally consume less memory. String literals can lead to duplicate storage, whereas character arrays allow more control over memory usage.
What happens when you perform pointer arithmetic on a pointer to a data type other than 'char'?
- It generates a compilation error
- It increments the pointer by one byte
- It results in undefined behavior
- It returns the size of the data type in bytes
When you perform pointer arithmetic on a pointer to a data type other than 'char,' it results in undefined behavior. This is because the pointer arithmetic depends on the size of the data type, and it may lead to accessing memory incorrectly.
What is the main purpose of using pointers in a C program?
- To allocate memory dynamically
- To create functions
- To perform arithmetic operations
- To store multiple values in a single variable
Pointers in C are used to allocate memory dynamically, which is a crucial feature for managing data efficiently. They allow you to allocate memory as per the program's requirements.
The ________ directive can be used in C to include a file only once in a program.
- #ifdef
- #ifndef
- #include
- #pragma
In C programming, the #include directive is used to include files in a program. When you want to include a file only once, you can use preprocessor directives like #ifndef and #define to create include guards.
Which function in C is used to flush the output buffer of a stream?
- clear()
- fflush()
- flush()
- flushout()
The correct function is fflush(). It is used to flush the output buffer of a stream, ensuring that any buffered data is written to the file or output device. This is particularly useful when you want to ensure that data is immediately written without waiting for the buffer to fill up.