What are some examples of while loops in C++?

What are some examples of while loops in C++?

Sure! A while loop in C++ repeatedly executes a block of code as long as a specified condition is true. Here's a simple example:

int i = 0;
while (i < 5) {
    std::cout << i << " ";
    i++;
}

This will print numbers 0 to 4.

Can you give me another example that uses user input?

Absolutely! Here's an example that continues to ask for user input until they enter a negative number:

int number;
std::cout << "Enter a number (negative to quit): ";
std::cin >> number;
while (number >= 0) {
    std::cout << "You entered: " << number << std::endl;
    std::cout << "Enter a number (negative to quit): ";
    std::cin >> number;
}

This loop will keep asking for numbers until a negative number is entered.

What happens if the condition is never false?

If the condition in a while loop never becomes false, it will create an infinite loop, causing the program to run indefinitely. For example:

int i = 0;
while (i < 5) {
    std::cout << i << " ";
    // i++ is missing here
}

In this case, since i never increments, the loop will never terminate.

How can I avoid infinite loops?

To avoid infinite loops, ensure that the loop's condition will eventually become false. Always update the loop variable within the loop body, and consider using a break statement to exit the loop if necessary.