BMI是身体质量指数(Body Mass Index)的缩写,是一种衡量人体肥胖程度的指标。它是根据人的身高和体重计算得出的,公式为:
BMI = 体重(kg)/ 身高^2(m)
其中,体重以千克为单位,身高以米为单位。根据计算结果,可以将人的体型分为偏瘦、正常、超重和肥胖四个等级。
BMI指数的范围和对应的等级如下:
- BMI < 18.5,偏瘦
- 18.5 <= BMI < 24.9,正常
- 24.9 <= BMI < 29.9,超重
- BMI >= 30,肥胖
完整源码如下:
import tkinter as tk
from tkinter import messageboxdef calculate_bmi():try:height = float(height_entry.get()) / 100 # 转换为米weight = float(weight_entry.get())bmi = weight / (height * height)bmi = round(bmi, 1) # 保留一位小数if bmi < 18.5:category = "偏瘦"range_info = "偏瘦范围: < 18.5"elif bmi < 24.9:category = "正常"range_info = "正常范围: 18.5 - 24.9"elif bmi < 29.9:category = "超重"range_info = "超重范围: 25 - 29.9"else:category = "肥胖"range_info = "肥胖范围: >= 30"result_label.config(text=f"BMI指数: {bmi}")category_label.config(text=f"等级: {category}")range_label.config(text=range_info)except ValueError:messagebox.showerror("错误", "请输入有效的身高和体重!")# 创建窗口
window = tk.Tk()
window.title("BMI指数计算")
window.geometry("600x400")# 创建标签和输入框
height_label = tk.Label(window, text="身高(cm):", font=("Arial", 14))
height_label.pack()
height_entry = tk.Entry(window, font=("Arial", 14))
height_entry.pack()weight_label = tk.Label(window, text="体重(kg):", font=("Arial", 14))
weight_label.pack()
weight_entry = tk.Entry(window, font=("Arial", 14))
weight_entry.pack()# 创建计算按钮
calculate_button = tk.Button(window, text="计算", command=calculate_bmi, font=("Arial", 14))
calculate_button.pack()# 创建结果标签
result_label = tk.Label(window, text="BMI指数: ", font=("Arial", 16, "bold"))
result_label.pack()category_label = tk.Label(window, text="等级: ", font=("Arial", 16, "bold"))
category_label.pack()range_label = tk.Label(window, text="", font=("Arial", 14))
range_label.pack()# 运行窗口
window.mainloop()
运行结果如下,身高已在计算过程中转换为米,此处是为了更方便地输入: