What is the result of comparing two strings using the '==' operator in C?
- It compares the ASCII values of the first characters
- It compares the content of the strings
- It compares the length of the strings
- It compares the memory addresses of the strings
In C, the '==' operator compares the memory addresses of the strings, not their content.
In a program that processes large amounts of data, what strategy can be used to optimize the performance of loops?
- Loop branching optimization
- Loop indexing optimization
- Loop parallelization
- Loop unrolling
To optimize the performance of loops when processing large data, 'loop unrolling' can be used. Loop unrolling reduces loop overhead and can improve data processing speed.
The fread function in C is used to read data from a file and stores the data in the ________.
- Buffer
- Memory
- Stack
- Registers
The fread function in C reads data from a file and stores it in memory, making option b) "Memory" the correct answer.
In C, the ________ function is used to copy a specified number of characters from one string to another.
- memcpy()
- strcpy()
- strncat()
- strncpy()
In C, the strncpy() function is used to copy a specified number of characters from one string to another. Unlike strcpy(), it allows you to specify the maximum number of characters to copy, which helps prevent buffer overflows and enhances program security.
What is the advantage of using pointers to structures instead of directly using structures?
- Easier debugging
- Enhanced code readability
- Faster access to data
- Improved memory management
Using pointers to structures allows for improved memory management by reducing memory wastage. When a structure is passed as a function argument, it is copied, leading to extra memory usage. Pointers avoid this issue.
In C, a ________ is used to store a sequence of characters.
- array
- function
- string
- variable
In C, a 'string' is used to store a sequence of characters. A string is an array of characters, typically represented as an array of 'char' data type.
What is a potential drawback of using bit fields in a cross-platform application?
- Inefficient memory usage
- Lack of platform portability
- Compiler-specific behavior
- Slower execution
The correct option is c) Compiler-specific behavior. Using bit fields in a cross-platform application can lead to issues due to compiler-specific behavior. Different compilers may interpret bit fields differently, causing inconsistencies across platforms.
Which function would you use to compare two strings lexicographically in C?
- strcat()
- strcmp()
- strcpy()
- strlen()
You would use the strcmp() function to compare two strings lexicographically in C. It returns 0 if the strings are equal, a positive value if the first string is greater, and a negative value if the second string is greater.
Using the ________ function, the file pointer can be moved to the end of a file.
- fseek()
- rewind()
- ftell()
- fsetpos()
The correct option is fseek(). This function is used to set the file position indicator to a specific position within the file. When the SEEK_END constant is provided as the reference point, it moves the file pointer to the end of the file, allowing operations like appending data.
In a graphics rendering engine, you need to apply different transformations (e.g., rotate, scale, translate) to objects. How can function pointers be used to simplify the implementation?
- Define a function pointer for each transformation type
- Use if-else statements to select transformations
- Use global variables to store transformation functions
- Implement each transformation directly in the code
Option A is the correct answer. By defining a function pointer for each transformation type, you can easily switch between different transformations without altering the engine's core logic. Options B, C, and D are less flexible and efficient. Option A simplifies the code.