Kotlin Function: Add two numbers with an explicit return type

Last update on August 27 2025 12:41:49 (UTC/GMT +8 hours)

Write a Kotlin function that takes two numbers as arguments and returns their sum. Explicitly specify the return type.

Pre-Knowledge (Before you start!)

Basic Kotlin Syntax: Familiarity with writing and running Kotlin programs.
Kotlin Functions: Understanding how to define and call functions in Kotlin.
Explicit Return Types: Knowledge of specifying return types for functions in Kotlin.
Arithmetic Operations: Ability to perform addition using the + operator.
Printing Output: Familiarity with the println() function to display output on the screen.

Hints (Try before looking at the solution!)

Define the Function.
Calculate the Sum.
Call the Function.
Display the Output.
Test with Different Numbers.
Common Errors to Avoid:
- Forgetting explicit return type.
- Misplacing addition logic.
- Not testing edge cases.

Sample Solution:

Kotlin Code:

fun calculateSum(num1: Int, num2: Int): Int {
    return num1 + num2
}

fun main() {
    val sum = calculateSum(7, 9)
    println("Sum: $sum")
}

Sample Output:

Sum: 16

Explanation:

In the above exercise -

The "calculateSum()" function takes two parameters num1 and num2, both of type Int. Inside the function, it calculates the sum of the two numbers by adding them together.
The function's return type is explicitly specified as Int. After addition, the function returns the sum as an integer value.
In the main function, we call the calculateSum function with arguments 7 and 9. The returned sum is stored in the sum variable. Finally, we print the sum value using println().

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Kotlin Editor:

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