The function ________ is used to read formatted input from the standard input.
- scanf
- printf
- cout
The "scanf" function is used in C and C++ to read formatted input from the standard input (usually the keyboard). It allows you to input and store values in variables while specifying the format in which data should be entered. Options like "print," "printf," and "cout" are used for output, not input.
String literals in C are stored in ________ memory segment.
- Code
- Data
- Heap
- Stack
In C, string literals are stored in the data memory segment. This segment contains constants, such as global and static variables.
You're developing a program to calculate the area of a circle. What data type would be most suitable to store the radius, considering it can be a fractional value?
- char
- double
- float
- int
To store the radius of a circle with fractional values, the most suitable data type in C is 'double' as it offers high precision for such calculations.
What is the purpose of using random access in file handling?
- To access files in a random order.
- To create files with random names.
- To generate random numbers for file operations.
- To perform direct read/write operations at any position within the file.
The purpose of using random access in file handling is to perform direct read and write operations at any position within the file. Random access allows you to jump to a specific location in a file and read or write data without having to sequentially process the entire file. It's especially useful for large files or databases.
In a scientific computation program, you need to represent a matrix of real numbers. What kind of array would be suitable for this purpose?
- 1D Array
- 2D Array
- Binary Tree
- Dynamic Array (ArrayList)
A 2D array is suitable for representing a matrix of real numbers as it offers a grid-like structure to store rows and columns of values.
In C, what is the result of the expression (5 & 3)?
- 0
- 1
- 3
- 5
In C, the '&' operator is the bitwise AND operator. When you perform (5 & 3), it bitwise ANDs the binary representation of 5 (0101) and 3 (0011). The result is 0001, which is 1 in decimal.
What is the behavior of malloc when the size requested is zero?
- It goes into an infinite loop
- It returns a null pointer (NULL)
- It returns a pointer to a zero-sized memory block
- It returns an error
When you request zero bytes of memory using malloc, it returns a null pointer (NULL) rather than allocating a zero-sized memory block. This is useful for special cases when you need a pointer that doesn't point to any memory.
How can double pointers be used in dynamic memory allocation in C?
- To allocate multi-dimensional arrays
- To create pointer arrays
- To manage pointer arithmetic
- To pass a pointer to a pointer
Double pointers are used in dynamic memory allocation when you need to pass a pointer to a pointer (to allocate and manage multi-dimensional arrays) or create arrays of pointers. They provide an extra level of indirection, which is beneficial for managing memory efficiently.
What is the time complexity of the linear search algorithm in the worst case?
- O(1)
- O(log n)
- O(n)
- O(n^2)
The linear search algorithm has a worst-case time complexity of O(n) because in the worst scenario, it needs to iterate through the entire array to find the target element.
In C programming, what is a common use case for having an array of structures?
- Storing data in a linked list.
- Storing data with different structures.
- Storing multiple records of the same type.
- Storing unrelated data types together.
A common use case for having an array of structures is to store multiple records of the same type. This allows you to create collections of related data with the same structure, such as a list of students' information or employee records.