软件工程个人项目：能自动生成小学四则运算题目的程序

import random
 
#四则运算
 
def szys():
 
    sym = [‘＋‘, ‘－‘, ‘ב, ‘÷‘]
 
    f= random.randint(0, 3)
 
    n1 = random.randint(1, 20)
 
    n2 = random.randint(1, 20)
 
    result = 0
 
    if f== 0:#加法
 
       result  = n1 + n2
 
    elif f == 1:#减法，要先比较大小，防止输出负数
 
        n1, n2 = max(n1, n2), min(n1, n2)
 
        result  = n1 - n2
 
    elif f== 2:#乘法
 
        result  = n1 * n2
 
    elif f == 3:#除法，要比较大小，并循环取整除
 
        n1, n2 = max(n1, n2), min(n1, n2)
 
        while n1 % n2 != 0:
 
            n1 = random.randint(1, 10)
 
            n2 = random.randint(1, 10)
 
            n1, n2 = max(n1, n2), min(n1, n2)
 
        result  = int(n1 / n2)
 
    print(n1, sym[f], n2, ‘= ‘, end=‘‘)
 
    return result
 
  
 
#制作题库
 
def test():
 
    sym = [‘＋‘, ‘－‘, ‘ב, ‘÷‘]
 
    print(‘输入所需要的题目数量‘)
 
    n=int(input())
 
    result =[]
 
    m=0
 
    while m<=(n-1):
 
        print(m+1,end=‘、‘)
 
        result .append(szys())
 
        print(‘ ‘)
 
        m=m+1
 
    m=0
 
    print(‘对应的答案：‘)
 
    while m<=(n-1):
 
        print(m+1,‘、‘,result [m])
 
        m=m+1
 
  
 
print(‘选择想要的模式‘)
 
print(‘1、进行四则运算‘)
 
print(‘2、制作题库‘)
 
n=int(input())
 
#当输入1时，进行四则运算，调用函数syzs()
 
if n==1:
 
    while True:
 
        result  = szys()
 
        j= input()
 
        s= int(j)
 
        if s== result :
 
            print(‘right‘)
 
        else:
 
            print(‘error.，the answer is‘, result )
 
#当输入2时，进行制作题库
 
if n==2:
 
     test()