The While Loop in C++
Loops are essential to programming because they let you repeat actions or tasks without writing the same code over and over again.
The while loop is one of the most important constructs in programming. To illustrate the idea behind a while loop, imagine you love coffee so much that you visit a coffee shop every day.
You keep going there as long as it's open and your routine remains unchanged, repeating the same actions with each visit. However, once the shop closes, you stop visiting.
A while loop works exactly the same, it performs a series of actions over and over again as long as a particular condition remains true, and it stops executing when that condition becomes false.
In C++ to create this loop, we use the while keyword. Following the keyword, we specify the condition within parentheses, and then within curly braces, we provide the instructions to be executed repeatedly as long as the condition remains true.
// keyword condition body
while ( ) { }
main.cpp
123456789101112#include <iostream> int main() { bool coffee_shop_is_open = true; // Condition // Loop executes as long as the coffee shop is ope while (coffee_shop_is_open) // Keyword (Condition) { // Body of the loop, this block will be executed repeatedly std::cout << "I am going to the coffee shop!" << std::endl; } }
Note
This is an infinite loop because the condition always remains
true. We will consider infinite loops in detail in future chapters.
There also can be multiple conditions in the loop using operators && and ||. For example, In the context of the coffee shop, we will visit it when it is open and when we have money. Both of these conditions must be met for us to continue going there. If the coffee shop is open but we don't have money, we will not go there.
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Loops are essential to programming because they let you repeat actions or tasks without writing the same code over and over again.
The while loop is one of the most important constructs in programming. To illustrate the idea behind a while loop, imagine you love coffee so much that you visit a coffee shop every day.
You keep going there as long as it's open and your routine remains unchanged, repeating the same actions with each visit. However, once the shop closes, you stop visiting.
A while loop works exactly the same, it performs a series of actions over and over again as long as a particular condition remains true, and it stops executing when that condition becomes false.
In C++ to create this loop, we use the while keyword. Following the keyword, we specify the condition within parentheses, and then within curly braces, we provide the instructions to be executed repeatedly as long as the condition remains true.
// keyword condition body
while ( ) { }
main.cpp
123456789101112#include <iostream> int main() { bool coffee_shop_is_open = true; // Condition // Loop executes as long as the coffee shop is ope while (coffee_shop_is_open) // Keyword (Condition) { // Body of the loop, this block will be executed repeatedly std::cout << "I am going to the coffee shop!" << std::endl; } }
Note
This is an infinite loop because the condition always remains
true. We will consider infinite loops in detail in future chapters.
There also can be multiple conditions in the loop using operators && and ||. For example, In the context of the coffee shop, we will visit it when it is open and when we have money. Both of these conditions must be met for us to continue going there. If the coffee shop is open but we don't have money, we will not go there.
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