What is the main limitation of using typedef to create an alias for a data type?
- It adds flexibility to data types
- It can lead to confusion with multiple typedefs
- It enforces strong data typing
- It increases code readability
The main limitation of using typedef to create an alias is that it can lead to confusion when multiple typedefs are used for the same base type.
The C function ________ is used to compare two strings lexicographically.
- strcmp
- strncmp
- strcompare
- strcasecmp
The correct answer is strcmp. This function compares two strings character by character and returns an integer value representing their lexicographical order. strncmp is used for comparing a specific number of characters, and the other options are not valid C functions.
You are debugging a C program and notice that the program crashes after running for a few minutes. Upon investigation, you find that a recursive function is being called multiple times. What could be the most likely cause of the crash?
- Hardware Failure
- Infinite Loop
- Memory Leak
- Stack Overflow
The most likely cause of the crash in this scenario is a stack overflow. When a recursive function is called multiple times without a proper base case or termination condition, it can fill up the call stack, causing a stack overflow and program crash.
What is the significance of using pointers in function arguments?
- It allows passing arguments by reference
- It enforces strong typing
- It reduces code readability
- It simplifies function declarations
Using pointers in function arguments allows passing arguments by reference, meaning the function can modify the original data, not just a copy. This is valuable when you want a function to modify variables from the caller's scope.
In a 'switch' statement, the ________ keyword is used to specify the code to execute if none of the cases match.
- Break
- Continue
- Default
- Exit
The correct option is (c) Default. In a 'switch' statement in C, the 'default' keyword is used to specify the code to execute if none of the cases match the provided value. It acts as a fallback option.
What might be a reason to use bit fields when designing a system with strict memory constraints?
- They allow more precise control over memory usage
- They improve code performance
- They offer greater data integrity
- They simplify code logic
Bit fields can be useful in systems with strict memory constraints because they allow more precise control over memory usage by packing data in smaller units.
What potential problem might occur when using fseek and ftell with large binary files?
- Data corruption
- Inaccurate file positioning
- Memory overflow
- Performance degradation
When working with large binary files, using fseek and ftell may result in inaccurate file positioning. This is because these functions use a single long integer to represent the file position, which may not be sufficient to handle the large offsets required for large files. This can lead to errors in file positioning and unintended behavior in your code.
In C, what happens if you attempt to open a file for reading using fopen() but the file does not exist?
- fopen() returns NULL, indicating that the file does not exist.
- fopen() raises an exception.
- fopen() creates a new file with the specified name.
- fopen() prompts the user to enter the correct file name.
The correct option is "fopen() returns NULL, indicating that the file does not exist." If the file does not exist or cannot be opened for some reason, fopen() returns a NULL pointer, indicating an error in opening the file.
What function is used to open a binary file for both reading and writing in C?
- fopen()
- open()
- openfile()
- readfile()
In C, the fopen() function is used to open a binary file for both reading and writing. It returns a file pointer, which is essential for performing file operations.
Pointers can lead to ________ if not managed correctly in a C program.
- Compilation errors
- Memory leaks
- Segmentation faults
- Stack overflows
Pointers in C can cause segmentation faults when not handled properly. A segmentation fault occurs when a program tries to access memory that it's not allowed to access.