Type conversion is always explicit in Kotlin - Mini Project: Build & Apply

Type conversion is always explicit

📖 Scenario: Imagine you are creating a simple calculator app that adds two numbers. The numbers are entered as strings, but to add them, you need to convert them to numbers first.

🎯 Goal: You will learn how to explicitly convert strings to integers in Kotlin before performing addition.

📋 What You'll Learn

Create two string variables with exact values

Create an integer variable to hold the sum

Convert strings to integers explicitly using toInt()

Add the converted integers and store the result

Print the sum

💡 Why This Matters

🌍 Real World

In real apps, user input often comes as text. You must convert it explicitly to numbers before calculations.

💼 Career

Understanding explicit type conversion is essential for Kotlin developers to avoid errors and write clear, safe code.

1

Create two string variables

Create two string variables called num1 and num2 with values "10" and "20" respectively.

Kotlin

# Create two string variables called num1 and num2 with values "10" and "20"
# Your code here

Need a hint?

Use val to create variables and assign the exact string values.

2

Create an integer variable for the sum

Create an integer variable called sum and set it to 0.

Kotlin

val num1 = "10"
val num2 = "20"
# Create an integer variable called sum and set it to 0
# Your code here

Need a hint?

Use var because you will change the value of sum later.

3

Convert strings to integers and add

Convert num1 and num2 to integers using toInt() and add them. Store the result in sum.

Kotlin

val num1 = "10"
val num2 = "20"
var sum = 0
# Convert num1 and num2 to integers and add them, store in sum
# Your code here

Need a hint?

Use toInt() to convert strings to integers before adding.

4

Print the sum

Print the value of sum using println().

Kotlin

val num1 = "10"
val num2 = "20"
var sum = 0
sum = num1.toInt() + num2.toInt()
# Print the sum
# Your code here

Need a hint?

Use println(sum) to show the result.