Why error handling is required in Go - See It in Action

Why error handling is required

📖 Scenario: Imagine you are writing a program that reads numbers from a list and divides 100 by each number. Sometimes, the number might be zero, which causes a problem called a "division by zero" error. To keep the program running smoothly, you need to handle such errors.

🎯 Goal: Build a simple Go program that divides 100 by numbers in a list and handles the error when division by zero happens.

📋 What You'll Learn

Create a slice of integers called numbers with the values 10, 5, 0, 2

Create a variable called result to store the division result

Use a for loop with variable num to iterate over numbers

Inside the loop, check if num is zero and handle the error by printing "Cannot divide by zero"

If no error, calculate result = 100 / num and print the result

The program should continue running even if an error occurs

💡 Why This Matters

🌍 Real World

Programs often get unexpected inputs or face problems like missing files or network issues. Error handling helps manage these situations gracefully.

💼 Career

Understanding error handling is essential for writing reliable software, a key skill for any software developer or engineer.

1

Create the list of numbers

Create a slice of integers called numbers with the values 10, 5, 0, and 2.

Go

# Create the slice numbers with values 10, 5, 0, 2
# Your code here

Hint

Use numbers := []int{10, 5, 0, 2} to create the slice.

2

Add a variable for the result

Add a variable called result of type int to store the division result inside the main function, after creating numbers.

Go

package main

func main() {
    numbers := []int{10, 5, 0, 2}
    // Declare an int variable called result
    // Your code here
}

Hint

Use var result int to declare the variable.

3

Loop through numbers and handle division by zero

Use a for loop with variable num to iterate over numbers. Inside the loop, check if num is zero. If it is, print "Cannot divide by zero". Otherwise, calculate result = 100 / num.

Go

package main

import "fmt"

func main() {
    numbers := []int{10, 5, 0, 2}
    var result int
    // Loop over numbers with num
    // Check if num is zero and print error
    // Else calculate result = 100 / num
    // Your code here
}

Hint

Use for _, num := range numbers to loop. Use if num == 0 to check zero.

4

Print the results and errors

Make sure the program prints the division results or the error message for each number in numbers. Run the program to see the output.

Go

package main

import "fmt"

func main() {
    numbers := []int{10, 5, 0, 2}
    var result int
    for _, num := range numbers {
        if num == 0 {
            fmt.Println("Cannot divide by zero")
        } else {
            result = 100 / num
            fmt.Println(result)
        }
    }
    // Run the program to see output
    // Your code here
}

Hint

Run the program and check the printed lines match the expected output.