20.Python练习---10以内的加法，100以内四则运算

练习1

代码如下:

import random			#导入随机数的函数库
AllCount = 0			#统计答题总数
RightCount = 0			#统计答题正确数
for i in range(1, 10):			#循环，设置该考试为10道题
    StudentAction = int(input('请选择你要执行的动作:(1)答题(2)退出: '))			#输入动作
    if StudentAction == 1:			#若选择答题
        num1 = random.randint(1, 10)			#生成第一个1～10之间的随机数
        num2 = random.randint(1, 10)			#生成第二个1～10之间的随机数
        sum = num1 + num2			#求和
        print('%d+%d=?' % (num1, num2))			#显示题目
        StudentAnswer = int(input("请输入答案："))			#输入答案
        if StudentAnswer == sum:			#若回答正确
            RightCount += 1			#正确数+1
            AllCount += 1			#答题总数+1
            i += 1			#控制循环的变量i+1
        else:			#若回答错误
            i += 1			#控制循环的变量+1
            AllCount += 1			#答题总数+1
    else:			#若选择退出
        print('bye~')			
        break			#直接跳出循环，不再进入循环答题
RightCountPercent = (RightCount / AllCount) * 100			#计算答题的正确率
print('该同学共答了%d道题目，正确的数量为%d道，正确率为%.2f%%' % (AllCount, RightCount, RightCountPercent))			
#显示输出

结果:

练习2

代码如下:

import random
AllCount = 0
RightCount = 0
for i in range(1, 10):
    StudentAction = int(input('请选择你要执行的动作:(1)答题(2)退出: '))
    if StudentAction == 1:
        num1 = random.randint(1, 10)
        num2 = random.randint(1, 10)
        a = ['+', '-', '*', '/']
        s = random.choice(a)
        if s == '+':
            sum = num1 + num2
            print('%d+%d=?' % (num1, num2))
            StudentAnswer = int(input("请输入答案："))
            if StudentAnswer == sum:
                RightCount += 1
                AllCount += 1
                i += 1
            else:
                i += 1
                AllCount += 1
        if s == '-':
            sum = num1 - num2
            print('%d-%d=?' % (num1, num2))
            StudentAnswer = int(input("请输入答案："))
            if StudentAnswer == sum:
                RightCount += 1
                AllCount += 1
                i += 1
            else:
                i += 1
                AllCount += 1
        if s == '*':
            sum = num1 * num2
            print('%d*%d=?' % (num1, num2))
            StudentAnswer = int(input("请输入答案："))
            if StudentAnswer == sum:
                RightCount += 1
                AllCount += 1
                i += 1
            else:
                i += 1
                AllCount += 1
        if s == '/':
            sum = num1 + num2
            print('%d/%d=?' % (num1, num2))
            StudentAnswer = int(input("请输入答案："))
            if StudentAnswer == sum:
                RightCount += 1
                AllCount += 1
                i += 1
            else:
                i += 1
                AllCount += 1
    else:
        print('byebye')
        break
RightCountPercent = (RightCount / AllCount) * 100
print('一共答了%d道题目，正确的数量为%d个，正确率为%.2f%%' % (AllCount, RightCount, RightCountPercent))

结果: