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交作业

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height=input(r'please enter the height(m):')

weight=input(r'please enter the weight(kg):')

a=0

try:

    a=float(weight)/(float(height)**2)

except ValueError:

    height=input(r'please enter your formal height(m):')

    weight=input(r'please enter your formal weight(kg):')

    a=float(weight)/(float(height)**2)

if a<18.5:

    print('BMI:%.2f ! you are too light'%a,end='\t')

elif 18.5<=a<25:

    print('BMI:%.2f ! you are nomal '%a,end='\t')

elif 25<=a<28:

    print('BMI:%.2f ! you are overweight'%a,end='\t')

elif 28<=a<32:

    print('BMI:%.2f ! you are fat'%a,end='\t')

else :

    print('BMI:%.2f ! you are severe obesity'%a,end='\t')


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