Swiftda Ichma-ich Looplar (Nested Loops)

Agar bitta loopning ichida yana boshqa loop bo'lsa, bu nested loop (ichma-ich loop) deyiladi.

Misol:

// tashqi loop
for i in 1...5 {

    // ichki loop
    for j in 1...2 {
        // code
    }
}

Bu yerda j bo'yicha for-loop — i bo'yicha for-loopning ichida joylashgan.

1. Swift Nested for Loop

Quyidagi misolda biz 2 hafta ichidagi 7 kunni chiqaramiz:

Swift•

Nested for loop

// Swift program to display 7 days of 2 weeks

// outer loop
for week in 1...2 {
  print("Week: \(week)")

  // inner loop
  for day in 1...7 {
      print("  Day:  \(day)")
  }

  // bo'sh qator
  print("")
}

Tushuntirish:

Tashqi loop → 2 marta ishlaydi (week = 1 va week = 2).
Ichki loop → har bir haftada 7 marta ishlaydi (day = 1 dan 7 gacha).

2. Nested while va repeat…while Looplar

Looplar faqat for-loop bilan emas, while yoki repeat…while bilan ham ichma-ich ishlatilishi mumkin.

Misol:

// outer while loop
while condition {
    
    // inner while loop
    while condition2 {
        // code
    }
}

3. for Loop ichida while Loop

Quyidagi misolda biz while loop tashqarida, for loop ichkarida ishlatamiz:

Swift•

while + for nested loop

// program to display 7 days of 2 weeks
var weeks = 2
var i = 1

// outer while loop
while (i <= weeks) {
  print("Week: \(i)")

  // inner for loop
  for day in 1...7 {
      print("  Day:  \(day)")
  }

  i = i + 1
}

4. break va continue ichma-ich looplarda

1. break — faqat ichki loopni to'xtatadi

Misol:

Swift•

Nested loop + break

for week in 1...3 {
  print("Week: \(week)")

  for day in 1...7 {
      if week == 2 {
          break
      }
      print("  Day:  \(day)")
  }

  print("")
}

Izoh:

week == 2 bo'lganda ichki loop darhol to'xtaydi.
Tashqi loop esa davom etadi.

2. continue — ichki loopning faqat o'sha iteratsiyasini o'tkazadi

Misol:

Swift•

Nested loop + continue

for week in 1...2 {
  print("Week: \(week)")

  for day in 1...7 {

      if day % 2 != 0 { // agar kun toq bo'lsa
          continue      // chiqarib o'tkaz
      }

      print("  Day:  \(day)")
  }

  print("")
}

Izoh:

Toq kunlar (1,3,5,7) continue tufayli chiqarilmaydi.
Faqat juft kunlar chop qilinadi.

📚 Masalalarni qanday yechish kerak?

✅ Namuna: 1-masala yechimi

Masala: n sonining ko'paytirish jadvalini yig'indisi sifatida qaytaring. Ya'ni n1 + n2 + ... + n*10.

Bosqichma-bosqich yechim:

1-qadam: Masalani tushunish

n = 5 → 5*1 + 5*2 + 5*3 + ... + 5*10 = 5 + 10 + 15 + ... + 50 = 275
Bu aslida n * (1+2+3+...+10) = n * 55

2-qadam: Nested loop yoki oddiy loop

Aslida bu masala bitta loop bilan ham yechiladi:

var sum = 0
for i in 1...10 {
    sum += n * i
}

3-qadam: To'liq yechim

Swift•

1-masala yechimi

func solve(_ n: Int) -> Int {
  var sum = 0
  for i in 1...10 {
      sum += n * i
  }
  return sum
}

// Tekshirish
print(solve(5))   // 275 (5*55)
print(solve(3))   // 165 (3*55)
print(solve(1))   // 55  (1*55)
print(solve(10))  // 550 (10*55)

Natija: Barcha testlar o'tadi ✅

Izoh:

n * 1 + n * 2 + ... + n * 10 = n * (1 + 2 + ... + 10) = n * 55
Loop bilan har bir ko'paytmani qo'shib boramiz
Bu masala nested loop talab qilmaydi, lekin nested loop mavzusini tushunish uchun foydali

Alternativ: return n * 55 — to'g'ridan-to'g'ri formula

Xulosa

Nested loop — loop ichida loop
Tashqi loop — birinchi bajariladi
Ichki loop — har bir tashqi iteratsiyada to'liq ishlaydi
break — faqat o'sha loopni to'xtatadi
continue — faqat o'sha iteratsiyani o'tkazadi
Label — tashqi loopni to'xtatish uchun