题解 | 取近似值

import sys

def fun(x):
    if x<=0 or x>20:
        return("请输入0<x≦20")
    
    int_x= int(x)
    difference_value = x-int_x
    if difference_value>=0.5:
        return int_x+1
    else:
        return int_x

if __name__ == "__main__":
    x=float(input(""))
    number=fun(x)
    print(number)