C code to golang

C code to golang: a beginner’s attempt

In the field of computer science, C language has always been a very popular programming language and is widely used in embedded systems, operating systems, and networks. Programming and other fields. Golang is a programming language that has emerged in recent years and has attracted more and more people's attention and love. As a C language developer, I have also developed a strong interest in golang, and want to convert algorithms previously implemented in C language into golang code. This article will record my thoughts, experiences and shortcomings in this process.

First of all, we need to find a C language algorithm suitable for our transformation. What I chose is the quick sort algorithm, which is a classic sorting algorithm based on the idea of ​​divide and conquer and has a time complexity of O(nlogn). I have written this algorithm in C language and tested it. The following is the code of this C language algorithm:

#include <stdio.h>

void quick_sort(int arr[], int left, int right) {
    if (left < right) {
        int i = left, j = right, x = arr[left];
        while (i < j) {
            while (i < j && arr[j] >= x) {
                j--;
            }
            if (i < j) {
                arr[i++] = arr[j];
            }
            while (i < j && arr[i] < x) {
                i++;
            }
            if (i < j) {
                arr[j--] = arr[i];
            }
        }
        arr[i] = x;
        quick_sort(arr, left, i - 1);
        quick_sort(arr, i + 1, right);
    }
}

int main() {
    int arr[10] = {3, 7, 2, 8, 1, 5, 10, 6, 4, 9};
    quick_sort(arr, 0, 9);
    for (int i = 0; i < 10; i++) {
        printf("%d ", arr[i]);
    }
    return 0;
}

Before converting it into golang code, I need to understand some basic features and grammatical rules of the golang language. Golang is a statically typed programming language and does not support implicit type conversion. In golang, the keyword for variable declaration is var, and the keyword for function declaration is func. In addition, golang's code structure is based on packages. Each code file should belong to a certain package, and other packages can be imported through the import keyword. Now, let's see how I translate the quick sort algorithm into golang code.

package main

import (
    "fmt"
)

func quick_sort(arr []int, left int, right int) {
    if left < right {
        i := left
        j := right
        x := arr[left]
        for i < j {
            for i < j && arr[j] >= x {
                j--
            }
            if i < j {
                arr[i] = arr[j]
                i++
            }
            for i < j && arr[i] < x {
                i++
            }
            if i < j {
                arr[j] = arr[i]
                j--
            }
        }
        arr[i] = x
        quick_sort(arr, left, i-1)
        quick_sort(arr, i+1, right)
    }
}

func main() {
    arr := []int{3, 7, 2, 8, 1, 5, 10, 6, 4, 9}
    quick_sort(arr, 0, len(arr)-1)
    fmt.Println(arr)
}

As you can see, the process of converting a C language algorithm into golang code is not difficult. We only need to be proficient in the corresponding grammar rules. In this example, I changed all variable types in C language to the corresponding golang types. In addition, since golang does not support the traditional function parameter writing method in C language, I used a function parameter writing method similar to C. In this way, I converted traditional C language programs into golang programs.

Of course, you may encounter some problems during the conversion process. For example, in golang, there is no sizeof operator in C language, so we need to use the len function to get the length of the array. In addition, there is no ternary operator in C language in golang. We need to use if-else statements to complete conditional judgment. These problems may make our golang code more lengthy and complex than C language code, but it also provides us with more freedom of thinking and design, making our code clearer and easier to understand.

To summarize, it is not too difficult to convert C language code into golang code. By learning the grammatical rules and features of golang, we can easily convert existing C language algorithm code into golang code. The programming styles of the two languages ​​are different, but both can help us write efficient and reliable programs. I hope this article can provide some help to readers who want to understand golang.

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