一些小题

1.用传统方法计算一个数的二进制

1.只能计算小于2**16的数字

 1 i = 17
 2 num_2 = int(input("输入一个数字：").strip())
 3 while True:
 4     i -= 1
 5     if i < 0:
 6         break
 7     if 2 ** i > num_2:
 8         print(0,end="")
 9     else:
10         print(1,end="")
11         num_2 = num_2 - 2 ** i

2.用平常数学方法解

num_2 = int(input("输入一个数字：").strip())
l = []
while True:
    b = num_2 // 2
    a = num_2 % 2
    num_2 = b
    l.append(a)
    if b == 0:
        break
l.reverse()
for i in l:
    print(i,end="")

2.用特殊字符输出一个指定高和底的空心长方形

 1 gao = int(input("输入高：").strip())
 2 di = int(input("输入底").strip())
 3 count1 = 1
 4 while count1 <= gao:
 5     count2 = 0
 6     while count2 <= di:
 7         count2 += 1
 8         if 2 <= count1 < gao and 2 <= count2 <= di:
 9             print(" ",end="")
10             continue
11         print("#",end="")
12     print()
13     count1 +=1

结果：

3.用特殊字符实现LED灯效果

 1  1 a = "  ********"
 2  2 b = "  *       "
 3  3 c = "         *"
 4  4 d = "  *      *"
 5  5 num = [
 6  6     [a,d,d,d,d,d,a],
 7  7     [c,c,c,c,c,c,c],
 8  8     [a,c,c,a,b,b,a],
 9  9     [a,c,c,a,c,c,a],
10 10     [d,d,d,a,c,c,c],
11 11     [a,b,b,a,c,c,a],
12 12     [a,b,b,a,d,d,a],
13 13     [a,c,c,c,c,c,c],
14 14     [a,d,d,a,d,d,a],
15 15     [a,d,d,a,c,c,c]
16 16 ]
17 17 int1 = input("输入数字:")
18 18 for i in range(7):
19 19     for j in int1:
20 20         print(num[int(j)][i], end="  ")
21 21     print()

结果：