Maximum and minimum number from array
let array: [Int] = [4, 8, 2, 6, 9] var max = array[0] var min = array[0] for i in 0..<array.count { if array[i] > max { max = array[I] } if array[i] < min { min = array[I] } } print("Max number: \(max)") print("Min number: \(min)") Find target number: Example1
func searchNumber(_ array: [Int], _ target: Int) -> Int { for (index, value) in array.enumerated() { if value == target { return value } } return -1 } let array: [Int] = [4, 8, 2, 6, 9] let target = 6 print(searchNumber(array, target)) // Output: 6 Find target number: Example2
let array: [Int] = [4, 8, 2, 6, 9] let target = 6 for i in 0..<array.count { if array[i] == target { print("Found \(target) at index \(i)") } } // Output: Found 6 at index 3 
✅ Swift: Find Two Numbers That Sum to a Target
Input:
An array of integers
A target sum value
Output:
true if any two numbers sum to the target, else false
Using a Set (Efficient O(n) Solution)
func hasTargetSum(_ nums: [Int], _ target: Int) -> Bool { var seen = Set<Int>() for num in nums { let complement = target - num if seen.contains(complement) { return true } seen.insert(num) } return false } // Example usage: let numbers = [2, 7, 11, 15] let target = 9 print(hasTargetSum(numbers, target)) // Output: true (2 + 7) 🔹 Explanation:
For each number, calculate its complement: target - num.
Check if the complement is already in the set.
If yes, we found a pair. Otherwise, add the number to the set and continue.
Using loop
let numbers = [2, 7, 11, 15] let target = 9 for i in 0..<numbers.count { for j in i+1..<numbers.count { if numbers[i] + numbers[j] == target { print("(\(numbers[i]), \(numbers[j]))") } } } ✅ Swift Program: Find Second Largest Element
func secondLargest(in numbers: [Int]) -> Int? { guard numbers.count >= 2 else { return nil } var first = Int.min var second = Int.min for num in numbers { if num > first { second = first first = num } else if num > second && num != first { second = num } } return second == Int.min ? nil : second } // Example usage let nums = [12, 35, 1, 10, 34, 1] if let result = secondLargest(in: nums) { print("Second largest number: \(result)") } else { print("No second largest number found.") } 
Top comments (0)