Python舍入变量打印0

Question

I have the next snippet in a program:

#weight in kg
weight = float(input('Enter your weight: '))
#height in cm
height = float(input('Enter your height: '))

bmi_metric = weight/(height**2)/(100**2)
print("{:.2f}".format(bmi_metric))

The problem is when I try to round even with round() function it spits 0 in console. If I let unformatted it gives me the right number with a lot of decimals. This is the console:

Enter your weight: 44
Enter your height: 182
0.000

Answer 1

Everything works fine (bmi_metric in your case is super small, so rounding gives 0 indeed), but you have a wrong equation for BMI calculation:

#weight in kg
weight = float(input('Enter your weight: '))
#height in cm
height = float(input('Enter your height: '))

bmi_metric = weight/((height/100)**2)
print("{:.2f}".format(bmi_metric))