一:打印*的四种格式:
第一种:==
row = 1
while row <= 5:
col = 1
while col <= row:
print('*',end='')
col += 1
print('')
row += 1
第二种:
row = 1
while row <= 5:
col = 5
while row <= col:
print('*',end='')
col -= 1
print('')
row += 1
第三种:
row = 1
while row <= 5:
k = 5
col = 1
while row <= k:
print(‘ ' ,end=(''))
k -=1
while col <= row:
print('*',end='')
col += 1
print('')
row += 1
第四种:
row = 1
while row <= 5:
k = 1
col = 5
while k <= row:
print(‘ ' ,end=(''))
k +=1
while row <= col:
print('*',end='')
col -= 1
print('')
row += 1
二:练习10以内的加法
设计一个程序,帮助小学生练习10以内的加法
详情:
- 随机生成加法题目;
- 学生查看题目并输入答案;
- 判别学生答题是否正确?
- 退出时, 统计学生答题总数,正确数量及正确率(保 留两位小数点);
import random
count = 0
right = 0
while True:
a = random.randint(0, 9)
b = random.randint(0, 9)
print('%d + %d = ' % (a, b))
question = input('请输入您的答案:(q退出)')
result = a + b
if question == str(result):
print('回答正确')
right += 1
count += 1
elif question == 'q':
break
else:
print('回答错误')
count += 1
percent = right / count
print('测试结束,共回答%d道题,正确个数为%d,正确率为%.2f%%' % (count, right, percent * 100))
扩展:
- 小学生算术能力测试系统: 设计一个程序,用来实现帮助小学生进行百以内的算术练习,它具有以 下功能: 提供10道加、减、乘或除四种基本算术运算的题目; 练习者根据显示的题目输入自己的答案,程序自动判断输入的答案是否 正确并显示出相应的信息。
import random
count = 0
right = 0
while True:
a = random.randint(0, 9)
# 作为除数
b = random.randint(1, 9)
op = ['+', '-', '*', '//']
d = random.choice(op)
print('%d %s %d = ' % (a, d, b))
question = input('请输入您的答案: (q退出)')
result1 = a + b
result2 = a - b
result3 = a * b
result4 = a // b
if question == str(result1):
print('回答正确')
right += 1
count += 1
elif question == str(result2):
print('回答正确')
right += 1
count += 1
elif question == str(result3):
print('回答正确')
right += 1
count += 1
elif question == str(result4):
print('回答正确')
right += 1
count += 1
elif question == 'q':
break
else:
print('回答错误')
count += 1
percent = right / count
print('测试结束,共回答%d道题,正确个数为%d,正确率为%.2f%%'
% (count, right, percent * 100))