Putting it together

Combine all parts into a working calculator.

Putting it together: for loop

In the last step we'll add a for loop to the calculator. for (i in 0..2) counts from 0 to 2 (inclusive). Inside the loop we'll call add(i, i) to print 0, 2, 4.

for (i in 0..2) {
    println(add(i, i))
}

This completes the project: addition, subtraction, multiplication, division and a loop of calculations.

Exercise Add the for loop

Inside the existing main, after the first println, add for (i in 0..2) { println(add(i, i)) }. Keep all other calls (subtract, multiply, try/catch with divide).

Show example solution

fun add(a: Int, b: Int): Int {
    return a + b
}
fun subtract(a: Int, b: Int): Int {
    return a - b
}
fun multiply(a: Int, b: Int): Int {
    return a * b
}
fun divide(a: Int, b: Int): Int {
    if (b == 0) {
        return 0
    }
    return a / b
}
fun main() {
    println("Calculator")
    for (i in 0..2) {
        println(add(i, i))
    }
    println(subtract(5, 3))
    println(multiply(5, 3))
    try {
        println(divide(10, 2))
    } catch (e: ArithmeticException) {
        println("Division by zero")
    }
}

Next step

Congratulations! You've completed the calculator project. Step by step you wrote a skeleton, added functions, used error handling, and ran several calculations in a loop.

In the next group you'll examine operators in detail: arithmetic, assignment, comparison, logical and the Elvis operator. These operators are the basic tools for writing calculations and conditions in code.

Test yourself

Match the project stages

L1

Skeleton
L2

add, subtract
L3

multiply, divide
L4

try/catch

for loop

for (i in 0____2) {
    println(add(i, i))
}

Show answer

for (i in 0.2) {
    println(add(i, i))
}

In the conventional order, in which sequence are operations added?
- divide, multiply, subtract, add
- subtract, multiply, divide, add
- add, subtract, multiply, divide
- multiply, divide, add, subtract
Show answer

add, subtract, multiply, divide — Addition, subtraction, multiplication, division is the common order.

Next lesson: Arithmetic operators

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