C Language Proficiency

What is the difference between a variable and a constant in C?

• A variable can change its value, while a constant cannot be used in C.

• A variable is declared using 'const' keyword, while a constant is declared using 'var' keyword.

• A variable can change its value, while a constant has a fixed value.

• A variable is used for storing fixed values, while a constant is used for storing changing values.

Explain the different data types available in C.

• boolean

• string

• int, float, double, char, void

• array

How do you declare and initialize an array in C?

• int arr = {1, 2, 3, 4, 5};

• int arr[5] = {1, 2, 3, 4, 5};

• int arr[5] = {1, 2, 3, 4, 6};

• int arr[5] = {1, 2, 3, 4};

What is the purpose of control structures in C?

• Control structures in C have no specific purpose

• Control structures in C are designed to confuse programmers

• The purpose of control structures in C is to manage the flow of execution in a program.

• Control structures in C are used for data storage

What is the syntax for defining a function in C?

• function_name(parameters) { // function body }

• return_type function_name(parameters) { // function body }

• return_type function_name(parameters) // function body

• return_type function_name(parameters) { // function body

How does recursion work in C? Provide an example.

• Recursion in C is not possible

• Recursion in C requires a special library

• Example: void recursiveFunction(int n) { if(n > 0) { printf('%d\n', n); recursiveFunction(n-1); } }

• Recursion in C can only be used with arrays

What are pointers in C? How are they different from normal variables?

• Pointers in C store memory addresses, while normal variables store actual values.

• Pointers in C are used for arithmetic operations, while normal variables are not.

• Pointers in C can only point to variables of the same data type, unlike normal variables.

• Pointers in C are always initialized to NULL, unlike normal variables.

Explain the concept of file handling in C.

• File handling in C is done using functions like open(), close(), read(), write(), etc.

• File handling in C is done using functions like fopen(), fclose(), fread(), fwrite(), etc. to perform operations on files.

• File handling in C is performed using functions such as fopen(), fclose(), fread(), fwrite(), etc.

• File handling in C involves using functions like open(), close(), read(), write(), etc.

How do you open a file in C for reading and writing?

• FILE *file = open('filename.txt', 'r+');

• FILE *file = fopen('filename.txt', 'a+');

• FILE *file = fopen('filename.txt', 'w+');

• FILE *file = fopen('filename.txt', 'r+');

What is the role of memory management in C?

• Memory management in C involves printing data to the console

• Memory management in C involves allocating and deallocating memory dynamically during program execution to prevent memory leaks and optimize memory usage.

• Memory management in C involves sorting arrays in ascending order

• Memory management in C involves handling user input from the keyboard