wiki/docs/算法/常见算法.md

---
id: 常见代码
title: 常见代码
sidebar_position: 3
data: 2022年1月27日
---
## 九九乘法表

```python
"""
输出乘法口诀表(九九表)

Version: 0.1
Author: 骆昊
"""

for i in range(1, 10):
    for j in range(1, i + 1):
        print('%d*%d=%d' % (i, j, i * j), end='\t')
    print()
```

## 判断是不是素数

```python
"""
输入一个正整数判断它是不是素数

Version: 0.1
Author: 骆昊
Date: 2018-03-01
"""
from math import sqrt

num = int(input('请输入一个正整数: '))
end = int(sqrt(num))
is_prime = True
for x in range(2, end + 1):
    if num % x == 0:
        is_prime = False
        break
if is_prime and num != 1:
    print('%d是素数' % num)
else:
    print('%d不是素数' % num)
```

## 打印三角形图案

```python
*
**
***
****
*****
```

```python
    *
   **
  ***
 ****
*****
```

```python
    *
   ***
  *****
 *******
*********
```

```python
"""
打印三角形图案

Version: 0.1
Author: 骆昊
"""

row = int(input('请输入行数: '))
for i in range(row):
    for _ in range(i + 1):
        print('*', end='')
    print()


for i in range(row):
    for j in range(row):
        if j < row - i - 1:
            print(' ', end='')
        else:
            print('*', end='')
    print()

for i in range(row):
    for _ in range(row - i - 1):
        print(' ', end='')
    for _ in range(2 * i + 1):
        print('*', end='')
    print()
```

## 寻找水仙花数

```python
"""
找出所有水仙花数

Version: 0.1
Author: 骆昊
"""

for num in range(100, 1000):
    low = num % 10
    mid = num // 10 % 10
    high = num // 100
    if num == low ** 3 + mid ** 3 + high ** 3:
        print(num)
```

## 数字反转

```python
"""
正整数的反转

Version: 0.1
Author: 骆昊
"""

num = int(input('num = '))
reversed_num = 0
while num > 0:
    reversed_num = reversed_num * 10 + num % 10
    num //= 10
print(reversed_num)
```

## 百钱百鸡

```python
"""
《百钱百鸡》问题

Version: 0.1
Author: 骆昊
"""

for x in range(0, 20):
    for y in range(0, 33):
        z = 100 - x - y
        if 5 * x + 3 * y + z / 3 == 100:
            print('公鸡: %d只, 母鸡: %d只, 小鸡: %d只' % (x, y, z))
```

## CRAPS赌博游戏

```python
"""
Craps赌博游戏
我们设定玩家开始游戏时有1000元的赌注
游戏结束的条件是玩家输光所有的赌注

Version: 0.1
Author: 骆昊
"""
from random import randint

money = 1000
while money > 0:
    print('你的总资产为:', money)
    needs_go_on = False
    while True:
        debt = int(input('请下注: '))
        if 0 < debt <= money:
            break
    first = randint(1, 6) + randint(1, 6)
    print('玩家摇出了%d点' % first)
    if first == 7 or first == 11:
        print('玩家胜!')
        money += debt
    elif first == 2 or first == 3 or first == 12:
        print('庄家胜!')
        money -= debt
    else:
        needs_go_on = True
    while needs_go_on:
        needs_go_on = False
        current = randint(1, 6) + randint(1, 6)
        print('玩家摇出了%d点' % current)
        if current == 7:
            print('庄家胜')
            money -= debt
        elif current == first:
            print('玩家胜')
            money += debt
        else:
            needs_go_on = True
print('你破产了, 游戏结束!')
```