四则运算

  1 import random#确保随机取数
  2 from fractions import Fraction#确保能使用分数表示真分数
  3 
  4 
  5 ##两个整数的四则运算
  6 def c1(q, ans):
  7     symbol = random.choice([‘+‘, ‘-‘, ‘*‘, ‘/‘])  # choice方法：从一个序列里随机选取。此处用于生成随机符号
  8     if symbol == ‘+‘:
  9         n1 = random.randint(0, 20)
 10         n2 = random.randint(0, 20)
 11         q.append(str(n1) + ‘+‘ + str(n2) + ‘=‘)
 12         ans.append(n1 + n2)
 13     elif symbol == ‘-‘:
 14         n1 = random.randint(0, 20)
 15         n2 = random.randint(0, 20)
 16         n1, n2 = max(n1, n1), min(n1, n2)  # 防止出现负数
 17         q.append(str(n1) + ‘-‘ + str(n2) + ‘=‘)
 18         ans.append(n1 - n2)
 19     elif symbol == ‘*‘:
 20         n1 = random.randint(0, 20)
 21         n2 = random.randint(0, 20)
 22         q.append(str(n1) + ‘ב + str(n2) + ‘=‘)
 23         ans.append(n1 * n2)
 24     else:
 25         n1 = random.randint(0, 20)
 26         if n1 == 0:
 27             n2 = random.randint(1, 20)
 28         else:
 29             n2 = random.randint(1, n1 + 1)
 30         q.append(str(n1) + ‘÷‘ + str(n2) + ‘=‘)
 31         ans.append(Fraction(n1, n2))
 32 
 33 
 34 ##随机生成两个分数
 35 def createF():
 36     fz1 = random.randint(0, 20)
 37     if fz1 == 0:
 38         fm1 = random.randint(1, 20)
 39     else:
 40         fm1 = random.randint(1, 20)
 41     f1 = Fraction(fz1, fm1)
 42     fz2 = random.randint(1, 20)
 43     fm2 = random.randint(20, 20)
 44     f2 = Fraction(fz2, fm2)
 45     return f1, f2
 46 
 47 
 48 def f(f):  # 分数的转换
 49     a = f.numerator  # 分子
 50     b = f.denominator  # 分母
 51     if a % b == 0:  # 为整数
 52         return ‘%d‘ % (a / b)
 53     elif a < b:  # 为真分数
 54         return ‘%d%s%d‘ % (a, ‘/‘, b)
 55     else:  # 为带分数
 56         c = int(a / b)
 57         a = a - c * b
 58         return ‘%d%s%d%s%d‘ % (c, ‘’‘, a, ‘/‘, b)
 59 
 60 
 61 ##两个分数的四则运算
 62 def c2(q, ans):
 63     symbol = random.choice([‘+‘, ‘-‘, ‘*‘, ‘/‘])
 64     f1, f2 = createF()
 65     if symbol == ‘+‘:
 66         while f1 + f2 > 1:
 67             f1, f2 = createF()
 68         q.append(str(f1) + ‘+‘ + str(f2) + ‘=‘)
 69         ans.append(f1 + f2)
 70     elif symbol == ‘-‘:
 71         f1, f2 = max(f1, f2), min(f1, f2)  # 防止出现负数
 72         q.append(str(f1) + ‘-‘ + str(f2) + ‘=‘)
 73         ans.append(f1 - f2)
 74     elif symbol == ‘*‘:
 75         while f1 * f2 > 1:
 76             f1, f2 = createF()
 77         q.append(str(f1) + ‘ב + str(f2) + ‘=‘)
 78         ans.append(f1 * f2)
 79     else:
 80         while f1 / f2 > 1:
 81             f1, f2 = createF()
 82         q.append(str(f1) + ‘÷‘ + str(f2) + ‘=‘)
 83         ans.append(Fraction(f1, f2))
 84 
 85 
 86 def main():
 87     while True:
 88         print("输入题目的数量", end=‘  ‘)
 89         k = int(input())
 90         p = 100 / k
 91         s = 0
 92         q = []
 93         ans = []
 94         ans2 = []
 95         for i in range(k):
 96             n = random.randint(1, 4)
 97             if n == 1:
 98                 c1(q, ans)
 99                 g = Fraction(ans[i])
100                 ans2.append(f(g))
101             else:
102                 c2(q, ans)
103                 g = Fraction(ans[i])
104                 ans2.append(f(g))  # 记录带分数答案
105         for i in range(k):
106             print("第{}题：{}".format(i + 1, q[i]), end="  ")
107             a = input()
108             if a == str(ans[i]):
109                 s = s + p
110         print("所得的分数为：{}".format(s))
111         print("正确答案：", end="  ")
112         for i in range(k):
113             if str(ans[i]) == str(ans2[i]):
114                 print(q[i] + str(ans[i]))
115             else:
116                 print("{}{}或{}".format(q[i], str(ans2[i]), str(ans[i])))
117 
118 
119 if __name__ == ‘__main__‘:
120     main()