C++ For Loop Quiz

What is the purpose of a "for loop" in C++?

• To execute code only once

• To execute code repeatedly based on a condition

• To define a function

• To declare a variable

Which of the following is the correct syntax for a "for loop" in C++?

• for (initialization, condition, increment/decrement) { code }

• for (initialization; condition; increment/decrement) { code }

• for initialization; condition; increment/decrement { code }

• for { initialization; condition; increment/decrement }

What is the output of the following code? for (int i = 1; i <= 3; i++) { cout << i << " "; }

• 1 2 3

• 1 2 3 4

• 0 1 2

• 3 2 1

What is a prime number?

• A number that is divisible by any number

• A number that has only two distinct divisors: 1 and itself

• A number that is always even

• A number that is always odd

What will the function isPrime(7) return? bool isPrime(int num) { if (num <= 1) return false; for (int i = 2; i <= num / 2; i++) { if (num % i == 0) { return false; } } return true; }

• true

• false

• 0

• Compilation error

What does the following factorial program do? int factorial = 1; for (int i = 1; i <= 5; i++) { factorial *= i; } cout << factorial;

• Calculates the sum of first 5 natural numbers

• Calculates 5! (5 factorial)

• Prints numbers from 1 to 5

• Finds the largest number among 5 numbers

How many times will the following loop execute? for (int i = 0; i < 5; i++) { cout << i; }

• 4 times

• 5 times

• Infinite times

• 6 times

In the sum of first N natural numbers program, what is the initial value of sum?

• 1

• N

• 0

• Undefined

What happens if the condition in a "for loop" is always true?

• The loop runs a fixed number of times

• The loop executes indefinitely (infinite loop)

• The loop runs only once

• The loop never executes

What does the following statement do in a for loop? for (int i = 1; i <= 10; i++) { sum += i; }

• Adds numbers from 1 to 10 to the variable sum

• Subtracts numbers from 1 to 10 from the variable sum

• Multiplies sum by numbers from 1 to 10

• None of the above