Kotlin Function: Add two numbers with an explicit return type

Last update on February 04 2025 08:17:18 (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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