The loop must ask for password at least once and repeat until the user enters "swift123".
Step 2: Check each option
var input = ""
repeat {
print("Enter password:")
input = readLine() ?? ""
} while input != "swift123" uses repeat-while, asks inside loop, and repeats while input is not "swift123". This matches the requirement. var input = ""
while input != "swift123" {
print("Enter password:")
input = readLine() ?? ""
} uses while loop, which may skip asking if input is already "swift123". repeat {
print("Enter password:")
input = readLine() ?? ""
} while input == "swift123" repeats while input equals "swift123", which is opposite of requirement. var input = ""
repeat {
input = readLine() ?? ""
} while input != "swift123"
print("Enter password:") prints prompt after loop ends, so user is not prompted before input.
Final Answer:
var input = ""
repeat {
print("Enter password:")
input = readLine() ?? ""
} while input != "swift123" -> Option C
Quick Check:
Repeat-while asks first, repeats until correct [OK]
Quick Trick:Use repeat-while to ask first, then check condition [OK]
Common Mistakes:
Using while loop that may skip first prompt
Reversing condition logic
Prompting outside the loop
Master "Loops" in Swift
9 interactive learning modes - each teaches the same concept differently
