Loops

A loop can execute a statement or group of statements multiple times and the following is the general from of a loop statement in most programming languages.

While Loop

A while loop statement repeatedly executes the code block within as long as the condition is true. The moment the condition becomes false, the program will exit the loop.

Note: The while loop might not ever run. If the condition is initially false, the code block will be skipped.

while (password != 1234) {
  std::cout << "Try again: ";
  std::cin >> password;
}

For Loop

A for loop executes a code block a specific number of times. It has three parts:

• The initialization of a counter
• The continue condition
• The increment/decrement of the counter

This example prints 0 to 9 on the screen:

for (int i = 0; i < 10; i++) {
  std::cout << i << "\n";
}