Understanding Loops and Functions

What is the primary difference between a for loop and a while loop?

• A for loop can only iterate over arrays, while a while loop can iterate over any data type.

• A while loop is always faster than a for loop regardless of the situation.

• A for loop requires a condition to terminate, while a while loop does not.

• The primary difference is that a for loop is used for a known number of iterations, while a while loop is used for an unknown number of iterations based on a condition.

How do you declare a pointer in C?

• int ptr;

• pointer int *ptr;

• int &ptr;

• int *ptr;

What is the output of the following code snippet: int a = 5; int *p = &a; printf('%d', *p);?

• 4

• 5

• 6

• 10

Explain the purpose of user-defined functions in programming.

• User-defined functions in programming serve to create reusable code blocks that enhance organization, readability, and maintainability.

• User-defined functions are only used for debugging purposes.

• User-defined functions are mandatory for all programming languages.

• User-defined functions can only be used once in a program.

What will happen if you try to dereference a null pointer?

• The program will continue running without any issues.

• A runtime error occurs, often leading to a crash.

• A warning message will be displayed, but execution will proceed.

• The pointer will automatically be assigned a valid memory address.

Write a simple for loop that prints numbers from 1 to 10.

• for (let i = 1; i < 10; i++) { console.log(i); }

• for (let i = 1; i <= 5; i++) { console.log(i); }

• for (let i = 0; i < 10; i++) { console.log(i); }

• for (let i = 1; i <= 10; i++) { console.log(i); }

What is the syntax for a do-while loop?

• while (condition) { /* code block */ } do;

• do { /* code block */ } while (condition);

• do { /* code block */ } until (condition);

• do (condition) { /* code block */ } while;

How can you use an if-else statement to check if a number is even or odd?

• Use an if-else statement to check if a number is positive or negative.

• Check if a number is even by using 'if (number % 2 != 0)' for even, else for odd.

• Use an if-else statement to check if a number is even or odd by evaluating 'if (number % 2 == 0)' for even, else for odd.

• An if-else statement cannot be used for checking even or odd numbers.

What is the purpose of the switch statement in C?

• The switch statement is used to declare variables in C.

• The switch statement is used for multi-way branching based on the value of an expression.

• The switch statement is used for error handling in C.

• The switch statement is used for defining functions in C.

How do you declare an array of integers in C?

• int[10] arr;

• int arr[10];

• array int arr[10];

• int array[10];