In C, the first element of an array can be accessed using index ________.
- -1
- 0
- 1
- 10
In C, arrays are zero-indexed, so the first element can be accessed using index 0.
You are tasked with optimizing memory usage in a real-time application that processes complex data structures. How can pointers assist in achieving this goal?
- Efficiently handle data references
- Implement data compression
- Minimize CPU load
- Reduce data complexity
Pointers can assist in optimizing memory usage by efficiently handling data references. They allow the application to store references to complex data structures rather than duplicating the data itself. This reduces memory consumption and benefits the real-time application's performance by avoiding unnecessary data duplication.
In C, the ________ operator is used to find the remainder of a division operation.
- Modulus (%)
- Division (/)
- Exponentiation (^)
- Multiplication (*)
The correct option is (a) Modulus (%). The modulus operator (%) in C is used to find the remainder of a division operation. For example, 10 % 3 equals 1 because the remainder when 10 is divided by 3 is 1.
What is the purpose of command line arguments in a C program?
- To display error messages
- To enhance program security
- To format program output
- To provide input data to the program
Command line arguments are used to provide input data to a C program. They allow users to pass values to the program when it's executed, making it versatile and interactive.
What happens if you try to modify a character in a string literal?
- It converts the string to uppercase
- It is allowed and won't cause any issues
- It raises a compile-time error
- It raises a run-time error
Modifying a character in a string literal is not allowed because string literals are stored in read-only memory, and attempting to modify them will result in a compile-time error.
In the context of function pointers in C, a callback function is a function that is passed as a(n) ________ to another function.
- Argument
- Parameter
- Pointer
- Variable
In C, a callback function is passed as a parameter to another function, allowing the function to call back to the provided function.
You're writing a program that needs to efficiently calculate the power of 2 for a given exponent. Which operator would be most efficient to use?
- * (Multiplication)
- ** (Exponentiation)
- << (Left Shift)
- ^ (Bitwise XOR)
The correct answer is C) ** (Exponentiation). To efficiently calculate the power of 2 for a given exponent, you should use the exponentiation operator (**).
What is the term used to describe the number of indices needed to select an element in a multidimensional array?
- Array Depth
- Dimensionality
- Index Complexity
- Selection Rank
The term used to describe the number of indices needed to select an element in a multidimensional array is dimensionality. In a multidimensional array, each dimension requires a separate index to access an element.
In an application that writes user data to a text file, what precaution should be taken to avoid data corruption or loss?
- Delay disk writes to optimize performance.
- Ensure the application flushes the buffer after each write.
- Overwrite existing data without checking for errors.
- Use a non-atomic write operation.
To avoid data corruption or loss, it's crucial to flush the buffer after each write operation to ensure data is written to the file immediately.
Which statement is true regarding the difference between inline functions and macros in C?
- Inline functions are always faster
- Inline functions can access local variables
- Macros are always inlined
- Macros are type-safe
Inline functions in C can access local variables and provide better type safety compared to macros. Macros are simple text replacements, which may lead to unexpected behavior.
A pointer in C holds the ________ of a variable.
- data value
- memory address
- size
- variable name
A pointer in C holds the memory address of a variable. It points to the location in memory where the variable's value is stored.
What is the significance of using pointers to functions in C?
- Faster execution
- Improved code reusability and flexibility
- No significance
- Safer code
Pointers to functions in C allow for dynamic function calls and can lead to improved code reusability and flexibility.