height=input('你的身高是多少米:')
height=float(height)
weight =input('你的体重是多少KG:')
weight =float(weight)
BMI=weight/(height*height)
if BMI>=24.9:
print('肥胖')
① BMI<24.9 ② BMI>=18.5:
print('正常')
else:
print('偏瘦')