Convert golang numbers to uppercase

Golang is a modern and popular programming language that supports multiple types of data operations, including strings, integers, floating point numbers, etc. In actual program development, sometimes it is necessary to convert numbers into uppercase Chinese numbers, such as converting 123456789 into the form of "one hundred million, two thousand, three hundred, four, five, ten thousand, six thousand, seven hundred, eighty, ten, nine".

To achieve this function, you can use Golang's built-in strconv package and combine it with some custom functions. The following is a sample code that supports converting integers to uppercase Chinese numbers:

package main

import (
    "fmt"
)

// 分割数字，每4位一组
func splitNum(num int64) []int64 {
    var nums []int64
    for num > 0 {
        nums = append(nums, num%10000)
        num /= 10000
    }
    return nums
}

// 转换数字为中文大写
func numToChinese(num int64) string {
    var digitMap = []string{"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"}
    var unitMap = []string{"", "拾", "佰", "仟", "万", "亿"}

    if num == 0 {
        return digitMap[0]
    }
    nums := splitNum(num)
    var res string
    for i := 0; i < len(nums); i++ {
        unit := unitMap[i%len(unitMap)]
        n := nums[i]
        if n == 0 {
            if i == len(nums)-1 {
                continue
            }
            res = digitMap[0] + unit + res
            continue
        }
        str := ""
        for j := 0; j < 4; j++ {
            digit := n % 10
            n /= 10
            if digit != 0 {
                str = digitMap[digit] + unitMap[j] + str
            } else if str != "" && str[:1] != digitMap[0] {
                str = digitMap[0] + str
            }
        }
        res = str + unit + res
    }
    //删除前导“零”
    for len(res) > 1 && res[:1] == digitMap[0] {
        res = res[1:]
    }
    return res
}

func main() {
    num := int64(123456789)

    fmt.Printf("%d的大写中文数字为：%s", num, numToChinese(num))
}

In the above code, the splitNum function is used to split the number into sub-numbers of four digits. The numToChinese function converts each sub-number into the corresponding uppercase Chinese number and adds the corresponding unit. Finally, the strings are concatenated into the final result.

When calling, you only need to pass the number to be converted into the numToChinese function to get the corresponding Chinese uppercase number.

In short, it is relatively simple to use Golang to convert numbers into uppercase Chinese numbers. It only needs to be combined with string splicing and judgment logic to complete.

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