鞋码换算

复制import json

# 鞋码换算表：{ (系统, 性别, 脚长cm): {目标系统: 码数} }
# 数据来源：ISO 9407:2019 Mondopoint 标准 + 各品牌常用对照
TABLE = {
    ("cn", "male", 26.0): {"us": 8.0, "eu": 41.0, "jp": 26.0},
    ("cn", "female", 23.5): {"us": 6.5, "eu": 37.0, "jp": 23.5},
    ("cn", "child", 18.0): {"us": 11.5, "eu": 28.0, "jp": 18.0},
}

def convert_shoe_size(foot_cm: float, gender: str, from_sys: str, to_sys: str) -> float | None:
    """
    根据脚长（cm）和性别，从一种鞋码系统换算到另一种。
    返回目标码数，若找不到对应则返回 None。
    """
    key = (from_sys, gender, foot_cm)
    if key not in TABLE:
        return None
    return TABLE[key].get(to_sys)

# 示例：中国男 26cm → 欧码
result = convert_shoe_size(26.0, "male", "cn", "eu")
print(result)  # 41.0

# 示例：中国女 23.5cm → 美码
result = convert_shoe_size(23.5, "female", "cn", "us")
print(result)  # 6.5

复制package main

import "fmt"

// ShoeSizeKey 作为换算表的复合键
type ShoeSizeKey struct {
	System string
	Gender string
	Cm     float64
}

// 基础换算表（ISO 9407 参考）
var table = map[ShoeSizeKey]map[string]float64{
	{"cn", "male", 26.0}:   {"us": 8.0, "eu": 41.0, "jp": 26.0},
	{"cn", "female", 23.5}: {"us": 6.5, "eu": 37.0, "jp": 23.5},
	{"cn", "child", 18.0}:  {"us": 11.5, "eu": 28.0, "jp": 18.0},
}

// ConvertShoeSize 根据脚长(cm)和性别，从 fromSys 换算到 toSys
func ConvertShoeSize(cm float64, gender, fromSys, toSys string) (float64, bool) {
	key := ShoeSizeKey{fromSys, gender, cm}
	entry, ok := table[key]
	if !ok {
		return 0, false
	}
	val, ok := entry[toSys]
	return val, ok
}

func main() {
	// 示例：中国男 26cm → 欧码
	if v, ok := ConvertShoeSize(26.0, "male", "cn", "eu"); ok {
		fmt.Printf("%.1f\n", v) // 41.0
	}

	// 示例：中国女 23.5cm → 美码
	if v, ok := ConvertShoeSize(23.5, "female", "cn", "us"); ok {
		fmt.Printf("%.1f\n", v) // 6.5
	}
}

复制// 鞋码换算表（ISO 9407 参考）
const TABLE = {
  'cn_male_26.0': { us: 8.0, eu: 41.0, jp: 26.0 },
  'cn_female_23.5': { us: 6.5, eu: 37.0, jp: 23.5 },
  'cn_child_18.0': { us: 11.5, eu: 28.0, jp: 18.0 },
};

/**
 * 鞋码换算
 * @param {number} footCm - 脚长（厘米）
 * @param {'male'|'female'|'child'} gender - 性别
 * @param {'cn'|'us'|'eu'|'jp'} fromSys - 来源系统
 * @param {'cn'|'us'|'eu'|'jp'} toSys - 目标系统
 * @returns {number|null} 目标码数，找不到返回 null
 */
function convertShoeSize(footCm, gender, fromSys, toSys) {
  const key = `${fromSys}_${gender}_${footCm}`;
  const entry = TABLE[key];
  return entry ? (entry[toSys] ?? null) : null;
}

// 示例：中国男 26cm → 欧码
console.log(convertShoeSize(26.0, 'male', 'cn', 'eu')); // 41

// 示例：中国女 23.5cm → 美码
console.log(convertShoeSize(23.5, 'female', 'cn', 'us')); // 6.5