题目描述

注意Python 保留小数的写法

old_num = 1.23456
new_num = '%.2f' % old_num
new_num1 = '%.3f' % old_num
print('保留2位小数结果：', new_num)
print('保留3位小数结果：', new_num1)

Python 代码

if __name__ == '__main__':
    n = float(input())
    l,r = -10000,10000
    while r - l>10**-8:
        mid=  (l+r)/2
        if mid**3<n:
            l = mid
        else:
            r = mid
    print("%.6f"%l)