Getting Started: Use Go to implement a simple small project

Golang is a new programming language that has the advantages of efficiency, simplicity, reliability, etc., and is deeply loved by developers. But if you are new to Golang and want to use Golang to complete some small projects, you may find it difficult. So, this article will introduce how to use Golang to implement a simple small project.

1. Select a project

First, we need to choose a simple project to practice the basic knowledge of Golang. Here, I chose a simple calculator, specifically, a calculator that supports addition, subtraction, multiplication and division.

2. Project structure

Before we start writing code, we need to establish the main structure of the project. Here, we will create a folder named calculator, which contains two files: main.go and calculator.go. Among them, main.go will serve as the entry point of the program, and calculator.go will implement the basic functions of the calculator.

3. Implement basic functions

In calculator.go, we need to implement four operations: addition, subtraction, multiplication and division. The following is a very simple implementation:

package calculator

func Add(a, b int) int {
    return a + b
}

func Sub(a, b int) int {
    return a - b
}

func Mul(a, b int) int {
    return a * b
}

func Div(a, b int) int {
    return a / b
}

The above are the four basic operation functions. Here we have only implemented the most basic functions, and more optimization is needed for practical applications.

4. Improve the program

Now we have completed the implementation of the basic functions, but our calculator still has some problems. For example, when performing division operation, the divisor may be 0, and the program will be abnormal. Therefore, we need to improve the program to deal with these abnormal situations.

First, we need to add a judgment to the Div function.

func Div(a, b int) (int, error) {
    if b == 0 {
        return 0, errors.New("division by zero")
    }
    return a / b, nil
}

As you can see, we have added a judgment condition here. If the divisor is 0, an error message will be returned.

Next, we need to write a function in main.go to call the calculator function we implemented. The following is a simple implementation:

package main

import (
    "fmt"
    "calculator"
)

func main() {
    // 加法
    sum := calculator.Add(1, 2)
    fmt.Println(sum)

    // 减法
    sub := calculator.Sub(4, 3)
    fmt.Println(sub)

    // 乘法
    mul := calculator.Mul(2, 5)
    fmt.Println(mul)

    // 除法
    div, err := calculator.Div(6, 0)
    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(div)
    }
}

As you can see, we call four operation functions here in sequence and output the operation results.

5. Run the program

Now, we can run the program to test whether our calculator is working properly. Run the following command in the terminal:

go run main.go calculator.go

You can see that the program runs normally and the operation results are output.

6. Summary

In this article, we introduce how to use Golang to implement a simple calculator project, which supports four operations of addition, subtraction, multiplication and division, and adds it to the Div function Error handling.

Although this is just a simple project, through this project, we can learn Golang's basic grammar, functions, packages and other knowledge, laying the foundation for developing more complex applications in the future.

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