How does C handle array indices that are out of bounds?
- C dynamically resizes the array
- C ignores out-of-bounds indices
- C throws a runtime error
- C wraps around to the beginning of the array
In C, when array indices are out of bounds, the behavior is undefined. C does not perform any bounds checking, and it's the programmer's responsibility to ensure indices are within bounds to avoid unexpected results.
The ________ loop checks the condition before executing the block of code.
- do-while
- for
- if
- while
The "do-while" loop is used in programming to check the condition after executing the block of code at least once. It guarantees that the loop body is executed at least once, as the condition is evaluated after the first iteration. On the other hand, "for" and "while" loops check the condition before entering the loop, and "if" is used for conditional statements, not loops.
What is the primary function of pointers in C?
- To manipulate strings
- To perform mathematical operations
- To provide dynamic memory allocation
- To store variables
Pointers in C are primarily used for dynamic memory allocation. They allow you to allocate and deallocate memory at runtime, which is essential for efficient memory usage and data structure implementation.
In C, when an array is passed to a function, is it passed by value or by reference?
- By reference
- By value
- It depends on the array size
- Not possible to pass arrays to functions
In C, arrays are passed to functions by reference, which means that changes made to the array inside the function affect the original array in the caller.
What is the primary cause of memory leaks in a C program?
- Excessive memory fragmentation.
- Failure to free dynamically allocated memory.
- Incorrect use of the malloc function.
- Insufficient memory allocation.
The primary cause of memory leaks in a C program is the failure to free dynamically allocated memory using functions like free(). When you allocate memory but don't deallocate it properly, it leads to memory leaks.
What is the scope of a global variable in a C program?
- Accessible throughout the entire program
- Limited to the file where it's declared
- Local to the function it's defined in
- Only within the main() function
In C, global variables have a scope that spans the entire program, meaning they can be accessed from any part of the code.
When a string is declared as a character array, the string must be terminated with a ________.
- comma
- null character
- semicolon
- space
In C, a string is a sequence of characters terminated by a null character (' '). This null character signifies the end of the string.
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.