Challenging C Programming Concepts

What is the output of the following code: int a = 10; int *p = &a; printf('%d', *p);?

• 20

• *p

• 10

• 10.0

Which of the following correctly allocates memory for an array of 10 integers?

• int array(10);

• int array[10];

• int array[] = new int[10];

• int[10] array;

What will be the result of the expression: sizeof(arr) / sizeof(arr[0]) if arr is an array of integers?

• total memory allocated for arr

• size of the array in bytes

• size of the first element in bytes

• number of elements in arr

How do you declare a pointer to a function that takes an int and returns void?

• void pointerName(int);

• int *pointerName(void);

• void (*pointerName)(int);

• void (*pointerName)(void);

What is the purpose of the 'free' function in C?

• To allocate memory on the stack.

• To deallocate memory previously allocated on the heap.

• To read data from a file.

• To initialize variables in C.

Which of the following statements correctly initializes a string in C?

• char* str = "Hello, World!";

• string str = "Hello, World!";

• char str = 'Hello, World!';

• char* str = Hello, World!;

What is the output of the following code: char str[] = 'Hello'; printf('%c', str[1]);?

• e

• H

• l

• o

What is the difference between '==' and '===' in C?

• In C, '==' checks for equality, while '===' is not a valid operator.

• '==' is used for assignment, while '===' checks for type and value equality.

• Both '==' and '===' are valid operators with the same functionality.

• '==' checks for type equality, while '===' checks for value equality.

How do you define a structure in C?

• class Person { char name[50]; int age; };

• struct Person { name: char[50]; age: int; };

• struct Person: char name[50], int age;

• struct Person { char name[50]; int age; };

What will happen if you try to access an uninitialized pointer?

• Undefined behavior occurs, potentially causing crashes or memory access errors.

• It will print a warning message to the console.

• Accessing it will always return a valid memory address.

• The pointer will automatically initialize to zero.