体重指数计算器：
BMI 是一种快速且廉价的方法，可将一个人的体重分为体重不足、正常、超重或肥胖。
BMI 公式：
BMI 的计算方法是体重除以身高的平方：
公制单位：
BMI = 体重 (kg) / [身高 (m)]2
美国习惯单位：
BMI = 体重（磅）/[身高（英寸）]2 x 703
示例：
# Input the weight in kilograms
weight = float(input("Enter your weight (in kg): "))
# Input the height in meters
height = float(input("Enter your height (in meters): "))
# Calculate BMI using the formula:
bmi = weight / (height ** 2)
# Output the calculated BMI value
print("BMI:", round(bmi, 2)) # Rounds BMI to 2 decimal places
# Function to provide feedback based on BMI
def bmi_feedback(bmi):
if bmi < 18.5:
return "You are underweight"
elif 18.5 <= bmi <= 24.9:
return "You have a healthy weight"
elif 25 <= bmi <= 29.9:
return "You are overweight"
else:
return "You are obese"
# Call the feedback function and store the result
bmi_result = bmi_feedback(bmi)
# Output the BMI category feedback
print("BMI Result:", bmi_result)
输出：
Enter your weight:58 Enter your height:1.67 BMI: 20.796729893506402 BMI Result: You have a healthy weight
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