编程小学数学学习系统， 具有随机出题、自动评分、查看正确答案、错题重做等功能的测试系统。山 设计程序运行界面 用户登录功能一 能用菜单选择测试系统的各功能，写出代码

以下是一个简单的 Python 实现，实现了基本的功能，可以根据实际需求进行改进：

import random

# 存储用户信息
users = {}

# 生成随机题目
def generate_question():
    # 题目类型：加、减、乘、除
    operators = ['+', '-', '*', '/']
    operator = random.choice(operators)
    
    # 生成两个操作数
    if operator == '+':
        a = random.randint(1, 100)
        b = random.randint(1, 100)
    elif operator == '-':
        a = random.randint(1, 100)
        b = random.randint(1, a)
    elif operator == '*':
        a = random.randint(1, 10)
        b = random.randint(1, 10)
    else:
        b = random.randint(1, 10)
        a = b * random.randint(1, 10)
    
    # 生成题目字符串
    question = str(a) + ' ' + operator + ' ' + str(b) + ' = ?'
    # 计算正确答案
    if operator == '/':
        answer = a // b
    else:
        answer = eval(str(a) + operator + str(b))
    
    return question, answer

# 用户登录
def login():
    username = input('请输入用户名：')
    if username in users:
        print('欢迎回来，', username)
    else:
        users[username] = {'score': 0, 'questions': []}
        print('欢迎新用户', username)

# 生成试卷
def generate_paper():
    paper = []
    for i in range(10):
        question, answer = generate_question()
        paper.append((question, answer))
    return paper

# 开始考试
def start_exam():
    paper = generate_paper()
    score = 0
    for i, (question, answer) in enumerate(paper):
        print('第{}题：{}'.format(i+1, question))
        user_answer = input('请输入答案：')
        if int(user_answer) == answer:
            print('回答正确！')
            score += 10
        else:
            print('回答错误，正确答案是', answer)
        users[username]['questions'].append((question, answer, user_answer))
    users[username]['score'] += score
    print('考试结束，本次得分：', score)

# 查看历史成绩
def view_score():
    if 'score' not in users[username]:
        print('您还没有进行过考试')
        return
    score = users[username]['score']
    print('您的历史成绩为：', score)

# 查看错题
def view_mistakes():
    if 'questions' not in users[username]:
        print('您还没有进行过考试')
        return
    mistakes = [(q, a, ua) for q, a, ua in users[username]['questions'] if int(ua) != a]
    if not mistakes:
        print('恭喜您，没有错题！')
    else:
        print('您的错题如下：')
        for q, a, ua in mistakes:
            print('题目：', q)
            print('您的答案：', ua)
            print('正确答案：', a)

# 主程序
while True:
    print('欢迎使用小学数学学习系统')
    print('请选择要进行的操作：')
    print('1. 登录')
    print('2. 开始考试')
    print('3. 查看历史成绩')
    print('4. 查看错题')
    print('5. 退出')
    choice = input()
    if choice == '1':
        login()
    elif choice == '2':
        if 'score' not in users[username]:
            print('您还没有进行过考试')
            continue
        start_exam()
    elif choice == '3':
        view_score()
    elif choice == '4':
        view_mistakes()
    elif choice == '5':
        print('谢谢使用，再见！')
        break