Mastering Loops

Here are three main types of loops in programming: while, do-while, and for. Each type of loop serves a different purpose, and mastering when and how to use each is key to writing efficient code.

While Loops

while(condition) {logic}

Use While loops when you do not need the logic in the loop to run at least once. The complier will check the condition inside of the while loop brackets, and then only run if it is a true statement.

int sum = 2;

while (sum < 100) {
    sum += sum * sum;
}

printf("%d", sum);

OUTPUT:

1806

Do While Loops

do { logic } while(condition);

Use Do While Loops when you do need logic to run at least once. The complier will run the code inside of the loop, then check the condition statement on the bottom. It will run again only if that statement is true.

In this example, the condition is false, but it will still run one time, then break out of the loop.