For Loop

Lesson 32/120

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Data Structures and Algorithms C++ Fundamentals

Lesson 32/120

The for Loop

The most common loop in DSA. Ideal when you know exactly how many times to iterate. All three parts — init, condition, update — live in one line.

ANATOMY

int i = 0→ init oncei < n→ check each iterationi++→ update after body

for (int i = 0; i < n; i++) {
    cout << i << " ";
}

Reverse iteration

for (int i = n-1; i >= 0; i--)

Step by 2

for (int i = 0; i < n; i += 2)

Multiple variables

for (int i=0, j=n; i<j; i++, j--)

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Counted Loop