网络程序设计 实验二 1.无穷级数 2.单词统计 3.播放高音

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public-time:2020-10-10 10:14

1.编写一个程序，求无穷级数的和sum=1+1/2+1/3+…1/n ，直到最后一项的精度小于0.000001。'''

def sum_1_n(n, accuracy):
    sum = 0
    for i in range(1, n + 1):
        e = 1.0 / i
        if e >= accuracy:
            sum += e
        else:
            break
    return sum


if __name__ == '__main__':
    print('''求无穷级数的和sum=1+1/2+1/3+…1/n ''')
    n = int(input("请输入n:"))
    print("sum=1+1/2+1/3+…1/n={}".format(sum_1_n(n, 0.000001)))

2.给定字符串“The quick brown box ...?”分离其中所有单词，并统计一下每个单词出现次数，按出现次数降序输出

import re


def sort(dic):
    # return list[]
    return sorted(dic.items(), key=lambda x: x[1], reverse=True)


def sum_1_n(s):
    count_word = dict()
    sum = re.split('[ .?]', s)
    sum = [i.lower() for i in sum]
    for i in sum:
        if (i != '') and (i not in count_word):
            count_word[i] = sum.count(i)
    # return dict{}
    return count_word


if __name__ == '__main__':
    s = "The quick brown box jumped over the lazy dog. An apple a day keeps the doctor away. Can a fox and a dog be friends?"
    print("单词出现的次数:")
    word_count = sort(sum_1_n(s))
    print("{:<8}\t{}".format("单词", "次数"))
    for i in word_count:
        print("{:<8}\t{}".format(i[0], i[1]))

3.随机播放一个钢琴的音高（范围：1-7），从控制台输入一个音高值，判断是否正确，并给出提示

import random
import winsound


def play_sound():
    n = random.randint(1, 7)
    winsound.Beep(n*100, 1000)
    return n


def play():
    answer = play_sound()
    n = int(input("输入一个音高值(1-7):"))
    if n == answer:
        s = "你输入的正确"
    else:
        s = "你输入的不正确"
    print("\t{}".format(s), end="\n\n")
    play()


if __name__ == '__main__':
    play()