Iterating over arrays in Go - Mini Project: Build & Apply

Iterating over arrays

📖 Scenario: You are helping a small shop owner who wants to check the prices of some fruits they have in stock.

🎯 Goal: You will create a program that stores fruit prices in an array, then uses a loop to print each fruit's price.

📋 What You'll Learn

Create an array with exact fruit prices

Create a variable to count the number of fruits

Use a for loop with index to iterate over the array

Print each fruit price with a message

💡 Why This Matters

🌍 Real World

Arrays and loops are used in many programs to store and process lists of data, like prices, names, or measurements.

💼 Career

Understanding how to iterate over arrays is a fundamental skill for software developers working with data collections.

1

Create the fruit prices array

Create an array called prices of type float64 with these exact values: 1.25, 0.75, 2.50, 3.00.

Go

package main

func main() {
    // Create the prices array with the exact values
}

Hint

Use the syntax prices := [4]float64{1.25, 0.75, 2.50, 3.00} to create the array.

2

Create a variable for the number of fruits

Create a variable called count and set it to the length of the prices array using the len function.

Go

package main

func main() {
    prices := [4]float64{1.25, 0.75, 2.50, 3.00}
    // Create count variable for the number of fruits
}

Hint

Use count := len(prices) to get the number of items in the array.

3

Use a for loop to iterate over the prices array

Use a for loop with the variable i from 0 to count (exclusive) to iterate over the prices array.

Go

package main

func main() {
    prices := [4]float64{1.25, 0.75, 2.50, 3.00}
    count := len(prices)
    // Add a for loop from i = 0 to i < count
}

Hint

Use for i := 0; i < count; i++ and access each price with prices[i].

4

Print each fruit price inside the loop

Inside the for loop, use fmt.Println to print the message "Price of fruit at index i: $price" where i is the index and price is the price at that index. Use fmt.Printf with formatting to show the price with two decimals.

Go

package main

import "fmt"

func main() {
    prices := [4]float64{1.25, 0.75, 2.50, 3.00}
    count := len(prices)
    for i := 0; i < count; i++ {
        // Print the price with index i
    }
}

Hint

Use fmt.Printf("Price of fruit at index %d: $%.2f\n", i, prices[i]) to print the message.