When you declare an array, what does the number inside the square brackets represent?
- Array's name length
- Index of the last element
- Number of elements in the array
- Total memory allocated to the array
The number inside the square brackets when declaring an array in C represents the number of elements or the size of the array. It indicates how many elements the array can hold.
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.
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.
In C, a double pointer is a pointer that points to another ________.
- double
- int
- pointer
- variable
In C, a double pointer is a pointer that points to another pointer. It is used to store the address of a pointer variable.
A ________ allows multiple variables to share the same memory location.
- Function
- Pointer
- Structure
- Union
A union allows multiple variables to share the same memory location, making it useful for scenarios where different types of data need to occupy the same memory space.
In C, an array name acts as a ________ pointing to the first element of the array.
- label
- pointer
- reference
- variable
In C, an array name is a constant pointer that points to the address of the first element in the array.