Which statement is true regarding the difference between inline functions and macros in C?
- Inline functions can have local variables
- Inline functions cannot be used with conditional compilation
- Macros are preprocessed
- Macros are type-safe
Macros in C are preprocessed, meaning they are replaced by their definitions before compilation. This can lead to unexpected behavior and debugging challenges. In contrast, inline functions are compiled as proper functions with type safety and can have local variables.
An array of structures can be used to represent a collection of ________ that share the same attributes but have different values.
- Constants
- Functions
- Objects
- Variables
Arrays of structures in C are commonly used to represent a collection of objects (or variables) that share the same attributes but have different values, making them an efficient way to manage related data.
How does a double pointer differ from a single pointer?
- Can store multiple values
- Points to a memory address
- Points to another pointer
- Stores double the data
A double pointer in C points to the memory address of a pointer, while a single pointer points to a single memory address. It allows for indirection, which can be useful in certain scenarios.
The use of ________ allows for dynamic memory allocation for arrays in C.
- for loop
- getchar()
- malloc()
- sizeof()
Dynamic memory allocation in C is achieved using functions like malloc().
How does the strtok() function work in C?
- It calculates the length of a string
- It converts a string to uppercase
- It performs a binary search
- It splits a string into multiple substrings based on a delimiter
The strtok() function in C is used to split a string into multiple substrings based on a specified delimiter. It maintains state between calls, making it useful for tokenizing strings.
What function can be used to find the current position of the file pointer in a file?
- fseek()
- readPosition()
- getCurrentPointer()
- filePosition()
The correct function to find the current position of the file pointer in a file is 'fseek()'. It allows you to set the file position indicator to a specific location in the file and returns the current position. The other options are not valid functions for this purpose.
You are developing a program to manage the seating arrangement in a movie theater with rows and columns. How would you represent the seats using arrays?
- 1D Array
- 2D Array
- Linked List
- Queue (FIFO)
Seats in a theater can be efficiently represented using a 2D array, with rows and columns, making it easy to access and manage each seat's status.
How does the 'return' statement affect the flow of control within a loop?
- The 'return' statement exits the loop, returning control to the calling function or method.
- The 'return' statement has no impact on the flow of control within a loop.
- The 'return' statement skips the next iteration of the loop.
- The 'return' statement terminates the entire program when used within a loop.
The 'return' statement is used to exit a function or method prematurely and return a value. When a 'return' statement is encountered within a loop, it immediately exits the loop and returns control to the calling function or method. This can be useful for ending a loop under certain conditions or returning a value from the loop.
When using dynamic memory allocation for arrays, which standard library function is used to release the memory that was previously reserved?
- calloc
- free
- malloc
- realloc
The correct function to release dynamically allocated memory is free. It is used to deallocate the memory previously reserved using malloc or calloc.
The function ________ is used to find the first occurrence of a character in a string in C.
- findchar
- locatechar
- strchr
- searchchar
The correct answer is strchr. strchr is a standard C function used to find the first occurrence of a character in a string. The other options are not valid C functions for this purpose.