golang reverse integer (two methods)

Golang is an efficient, modern programming language that has unique advantages in handling number reversal. This article will introduce you to the method and implementation of reversing integers in Golang.

Golang’s need to reverse integers

In programming practice, we often need to reverse integers. For example, when we need to reverse a number 12345 into 54321, we need to reverse the integer. This kind of operation is very common in fields such as cryptography, data structures, algorithms, etc. Therefore, Golang provides some convenient methods so that developers can quickly implement integer reversal.

Method 1: Use string flipping

Golang provides a quick way to reverse integers, that is, convert the integers to strings first, and then flip the strings. The following is a simple implementation:

func reverseInt(n int) int {
    var sign int
    if n < 0 {
        sign = -1
    } else {
        sign = 1
    }

    str := strconv.Itoa(n * sign)
    bytes := []byte(str)
    reverseBytes(bytes)
    str = string(bytes)

    reversed, err := strconv.Atoi(str)
    if err != nil {
        return 0
    }

    return sign * reversed
}

func reverseBytes(bytes []byte) {
    for i := 0; i < len(bytes)/2; i++ {
        j := len(bytes) - i - 1
        bytes[i], bytes[j] = bytes[j], bytes[i]
    }
}

The implementation of this function is very simple. First, we convert the integer into a string according to the sign, then reverse the string, and finally convert it into an integer and return it. This method is very intuitive and easy to understand. However, since it involves string conversion, it is less efficient and is not suitable for processing large amounts of data.

Method 2: Realize through mathematical calculation

The second method is to use mathematical calculation to realize the inversion of integers. The implementation of this method is very simple, we only need to take each digit of the integer in turn and add it to the result. The following is a simple code implementation:

func reverseInt(n int) int {
    var reversed int
    for n != 0 {
        lastDigit := n % 10
        reversed = reversed*10 + lastDigit
        n /= 10
    }
    return reversed
}

The implementation of this method is very clear. We only need to continuously extract the last digit of the integer through the loop and then add it to the result. This method does not involve string conversion, so it is more efficient.

Summary

The above two methods are good ways to solve the integer reversal problem in Golang, and they are relatively simple and easy to understand. Based on business needs and actual scenarios, developers can flexibly choose different implementation methods.

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