小学四则运算编程实践

代码

import random

from fractions import Fraction





##两个整数的四则运算

def c1(q, ans):

symbol = random.choice(['+', '-', '*', '/'])  # 生成随机符号

if symbol == '+':

    n1 = random.randint(0, 20)

    n2 = random.randint(0, 20)

    q.append(str(n1) + '+' + str(n2) + '=')

    ans.append(n1 + n2)

elif symbol == '-':

    n1 = random.randint(0, 20)

    n2 = random.randint(0, 20)

    n1,n2 = max(n1,n1),min(n1,n2)#防止出现负数

    q.append(str(n1) + '-' + str(n2) + '=')

    ans.append(n1 - n2)

elif symbol == '*':

    n1 = random.randint(0, 20)

    n2 = random.randint(0, 20)

    q.append(str(n1) + '×' + str(n2) + '=')

    ans.append(n1 * n2)

else:

    n1 = random.randint(0, 20)

    if n1 == 0:

        n2 = random.randint(1, 20)

    else:

        n2 = random.randint(1, n1 + 1)

    q.append(str(n1) + '÷' + str(n2) + '=')

    ans.append(Fraction(n1, n2))





##随机生成两个分数

def createF():

fz1 = random.randint(0, 20)

if fz1 == 0:

    fm1 = random.randint(1, 20)

else:

    fm1 = random.randint(1, 20)

f1 = Fraction(fz1, fm1)

fz2 = random.randint(1, 20)

fm2 = random.randint(20, 20)

f2 = Fraction(fz2, fm2)

return f1, f2



def f(f):#分数的转换

a=f.numerator #分子

b=f.denominator #分母

if a%b==0:#为整数

    return '%d'%(a/b)

elif a<b:#为真分数

    return '%d%s%d' % (a,'/',b)

else:#为带分数

    c=int(a/b)

    a = a - c * b

    return '%d%s%d%s%d' % (c,'’',a,'/',b)



##两个分数的四则运算

def c2(q,ans):

symbol = random.choice(['+','-','*','/'])

f1,f2 = createF()

if symbol =='+':

    while f1+f2>1:

        f1,f2 = createF()

    q.append(str(f1)+'+'+str(f2)+'=')

    ans.append(f1+f2)

elif symbol =='-':

    f1,f2 = max(f1,f2),min(f1,f2)#防止出现负数

    q.append(str(f1)+'-'+str(f2)+'=')

    ans.append(f1-f2)

elif symbol == '*':

    while f1*f2>1:

        f1,f2 = createF()

    q.append(str(f1)+'×'+str(f2)+'=')

    ans.append(f1*f2)

else:

    while f1/f2>1:

        f1,f2=createF()

    q.append(str(f1)+'÷'+str(f2)+'=')

    ans.append(Fraction(f1,f2))





def main():

while 1:

    print("输入题目的数量", end='  ')

    k = int(input())

    p = 100 / k

    s = 0

    q = []

    ans = []

    ans2 = []

    for i in range(k):

        n = random.randint(1, 4)

        if n == 1:

            c1(q, ans)

            g = Fraction(ans[i])

            ans2.append(f(g))

        else:

            c2(q, ans)

            g = Fraction(ans[i])

            ans2.append(f(g))#记录带分数答案

    for i in range(k):

        print("第{}题：{}".format(i + 1, q[i]), end="  ")

        a = input()

        if a == str(ans[i]):

            s = s + p

    print("所得的分数为：{}".format(s))

    print("正确答案：", end="  ")

    for i in range(k):

        if str(ans[i]) == str(ans2[i]):

            print(q[i] + str(ans[i]))

        else:

            print("{}{}或{}".format(q[i],str(ans2[i]),str(ans[i])))



if __name__ == '__main__':

main()

结果