Given a variable num, write a when expression that returns "Even" if num is divisible by 2, "Odd" if divisible by 3, and "Other" otherwise. Which code is correct?
hard📝 Application Q9 of 15
Kotlin - Control Flow as Expressions
Given a variable num, write a when expression that returns "Even" if num is divisible by 2, "Odd" if divisible by 3, and "Other" otherwise. Which code is correct?
Aval result = when {
num / 2 == 0 -> "Even"
num / 3 == 0 -> "Odd"
else -> "Other"
}
Bval result = when (num) {
2 -> "Even"
3 -> "Odd"
else -> "Other"
}
Cval result = when {
num % 2 == 0 -> "Even"
num % 3 == 0 -> "Odd"
else -> "Other"
}
Dval result = when {
num % 2 = 0 -> "Even"
num % 3 = 0 -> "Odd"
else -> "Other"
}
Step-by-Step Solution
Solution:
Step 1: Understand the conditions for divisibility
Divisible by 2 means remainder zero with %, same for 3.
Step 2: Check syntax correctness
val result = when {
num % 2 == 0 -> "Even"
num % 3 == 0 -> "Odd"
else -> "Other"
} uses correct conditions and arrows; val result = when (num) {
2 -> "Even"
3 -> "Odd"
else -> "Other"
} matches exact values incorrectly; val result = when {
num / 2 == 0 -> "Even"
num / 3 == 0 -> "Odd"
else -> "Other"
} uses division instead of modulo; val result = when {
num % 2 = 0 -> "Even"
num % 3 = 0 -> "Odd"
else -> "Other"
} uses assignment (=) instead of comparison (==).
Final Answer:
val result = when {
num % 2 == 0 -> "Even"
num % 3 == 0 -> "Odd"
else -> "Other"
} -> Option C
Quick Check:
Use modulo (%) and == for conditions in when [OK]
Quick Trick:Use modulo (%) and == for divisibility checks in when [OK]
Common Mistakes:
MISTAKES
Using division instead of modulo
Using single = instead of ==
Matching exact values instead of conditions
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