Loops

// For loop
for (int i = 0; i < 5; i++) {
    cout << i << " ";
}
// 0 1 2 3 4

// While loop
int count = 0;
while (count < 5) {
    cout << count << " ";
    count++;
}

// Do-while
int n;
do {
    cout << "Enter positive number: ";
    cin >> n;
} while (n <= 0);

// Range-based for loop (C++11)
int arr[] = {10, 20, 30, 40, 50};
for (int num : arr) {
    cout << num << " ";
}

// break and continue
for (int i = 0; i < 10; i++) {
    if (i == 5) break;      // stop at 5
    if (i % 2 == 0) continue; // skip even
    cout << i << " ";       // 1 3
}