油耗换算

复制def l100km_to_mpg(l100km):
    """L/100km → MPG (美制)"""
    if l100km <= 0:
        raise ValueError("油耗必须大于 0")
    return 235.214583 / l100km

def mpg_to_l100km(mpg):
    """MPG (美制) → L/100km"""
    if mpg <= 0:
        raise ValueError("MPG 必须大于 0")
    return 235.214583 / mpg

def l100km_to_kml(l100km):
    """L/100km → km/L"""
    if l100km <= 0:
        raise ValueError("油耗必须大于 0")
    return 100 / l100km

def kml_to_l100km(kml):
    """km/L → L/100km"""
    if kml <= 0:
        raise ValueError("km/L 必须大于 0")
    return 100 / kml

# 示例：8 L/100km
print(f"8 L/100km = {l100km_to_mpg(8):.2f} MPG")  # 29.40 MPG
print(f"8 L/100km = {l100km_to_kml(8):.2f} km/L")  # 12.50 km/L

# 示例：30 MPG
print(f"30 MPG = {mpg_to_l100km(30):.2f} L/100km")  # 7.84 L/100km

复制package main

import (
	"fmt"
	"math"
)

const mpgFactor = 235.214583 // 美制 MPG 转换常数

func L100kmToMPG(l100km float64) (float64, error) {
	if l100km <= 0 {
		return 0, fmt.Errorf("油耗必须大于 0")
	}
	return mpgFactor / l100km, nil
}

func MPGToL100km(mpg float64) (float64, error) {
	if mpg <= 0 {
		return 0, fmt.Errorf("MPG 必须大于 0")
	}
	return mpgFactor / mpg, nil
}

func L100kmToKmL(l100km float64) (float64, error) {
	if l100km <= 0 {
		return 0, fmt.Errorf("油耗必须大于 0")
	}
	return 100 / l100km, nil
}

func KmLToL100km(kmL float64) (float64, error) {
	if kmL <= 0 {
		return 0, fmt.Errorf("km/L 必须大于 0")
	}
	return 100 / kmL, nil
}

func main() {
	// 示例：8 L/100km
	mpg, _ := L100kmToMPG(8)
	kmL, _ := L100kmToKmL(8)
	fmt.Printf("8 L/100km = %.2f MPG\n", math.Round(mpg*100)/100)  // 29.40 MPG
	fmt.Printf("8 L/100km = %.2f km/L\n", math.Round(kmL*100)/100) // 12.50 km/L

	// 示例：30 MPG
	l100km, _ := MPGToL100km(30)
	fmt.Printf("30 MPG = %.2f L/100km\n", math.Round(l100km*100)/100) // 7.84 L/100km
}

复制const MPG_FACTOR = 235.214583; // 美制 MPG 转换常数

function l100kmToMpg(l100km) {
  if (l100km <= 0) throw new Error('油耗必须大于 0');
  return MPG_FACTOR / l100km;
}

function mpgToL100km(mpg) {
  if (mpg <= 0) throw new Error('MPG 必须大于 0');
  return MPG_FACTOR / mpg;
}

function l100kmToKml(l100km) {
  if (l100km <= 0) throw new Error('油耗必须大于 0');
  return 100 / l100km;
}

function kmlToL100km(kml) {
  if (kml <= 0) throw new Error('km/L 必须大于 0');
  return 100 / kml;
}

// 示例：8 L/100km
console.log(`8 L/100km = ${l100kmToMpg(8).toFixed(2)} MPG`);  // 29.40 MPG
console.log(`8 L/100km = ${l100kmToKml(8).toFixed(2)} km/L`); // 12.50 km/L

// 示例：30 MPG
console.log(`30 MPG = ${mpgToL100km(30).toFixed(2)} L/100km`); // 7.84 L/100km