Python编程题：打印九九乘法表

方法一：for循环打印九九乘法表：

• 1到4的乘法：

for i in range(1,5):
    print("{} * 'j'".format(i),end='\t')
    print() # 看i值，换行

【1 * ‘j’ 】中第1个数，每增1就换行。

输出结果：

1 * 'j'	# 打印完这行，就print()换行
2 * 'j'	
3 * 'j'	
4 * 'j'	

• 1到4的乘法：

for i in range(1,5):
    for j in range(1,i+1):
        print("{} * {}".format(i,j),end='\t')
    print() # 看i值，换行

输出结果：

1 * 1	
2 * 1	2 * 2	
3 * 1	3 * 2	3 * 3	
4 * 1	4 * 2	4 * 3	4 * 4	

• 九九乘法表(完整代码)：

for i in range(1,10):
    for j in range(1,i+1):
        print("{} * {} = {}".format(i,j,i*j),end='\t')
    print() # 看i值，换行

输出结果：

1 * 1 = 1	
2 * 1 = 2	2 * 2 = 4	
3 * 1 = 3	3 * 2 = 6	3 * 3 = 9	
4 * 1 = 4	4 * 2 = 8	4 * 3 = 12	4 * 4 = 16	
5 * 1 = 5	5 * 2 = 10	5 * 3 = 15	5 * 4 = 20	5 * 5 = 25	
6 * 1 = 6	6 * 2 = 12	6 * 3 = 18	6 * 4 = 24	6 * 5 = 30	6 * 6 = 36	
7 * 1 = 7	7 * 2 = 14	7 * 3 = 21	7 * 4 = 28	7 * 5 = 35	7 * 6 = 42	7 * 7 = 49	
8 * 1 = 8	8 * 2 = 16	8 * 3 = 24	8 * 4 = 32	8 * 5 = 40	8 * 6 = 48	8 * 7 = 56	8 * 8 = 64	
9 * 1 = 9	9 * 2 = 18	9 * 3 = 27	9 * 4 = 36	9 * 5 = 45	9 * 6 = 54	9 * 7 = 63	9 * 8 = 72	9 * 9 = 81	

打印如下九九乘法表

9 * 1 = 9	9 * 2 = 18	9 * 3 = 27	9 * 4 = 36	9 * 5 = 45	9 * 6 = 54	9 * 7 = 63	9 * 8 = 72	9 * 9 = 81	
8 * 1 = 8	8 * 2 = 16	8 * 3 = 24	8 * 4 = 32	8 * 5 = 40	8 * 6 = 48	8 * 7 = 56	8 * 8 = 64	
7 * 1 = 7	7 * 2 = 14	7 * 3 = 21	7 * 4 = 28	7 * 5 = 35	7 * 6 = 42	7 * 7 = 49	
6 * 1 = 6	6 * 2 = 12	6 * 3 = 18	6 * 4 = 24	6 * 5 = 30	6 * 6 = 36	
5 * 1 = 5	5 * 2 = 10	5 * 3 = 15	5 * 4 = 20	5 * 5 = 25	
4 * 1 = 4	4 * 2 = 8	4 * 3 = 12	4 * 4 = 16	
3 * 1 = 3	3 * 2 = 6	3 * 3 = 9	
2 * 1 = 2	2 * 2 = 4	
1 * 1 = 1	

代码如下：

for i in range(9,0,-1):
    for j in range(1,i+1):
        print(f"{i} * {j} = {i*j}",end="\t")
    print()

二、while循环打印九九乘法表

方向一：
根据下面的格式打印九九乘法表：

1 * 1 = 1	
2 * 1 = 2	2 * 2 = 4	
3 * 1 = 3	3 * 2 = 6	3 * 3 = 9	
4 * 1 = 4	4 * 2 = 8	4 * 3 = 12	4 * 4 = 16	
5 * 1 = 5	5 * 2 = 10	5 * 3 = 15	5 * 4 = 20	5 * 5 = 25	
6 * 1 = 6	6 * 2 = 12	6 * 3 = 18	6 * 4 = 24	6 * 5 = 30	6 * 6 = 36	
7 * 1 = 7	7 * 2 = 14	7 * 3 = 21	7 * 4 = 28	7 * 5 = 35	7 * 6 = 42	7 * 7 = 49	
8 * 1 = 8	8 * 2 = 16	8 * 3 = 24	8 * 4 = 32	8 * 5 = 40	8 * 6 = 48	8 * 7 = 56	8 * 8 = 64	
9 * 1 = 9	9 * 2 = 18	9 * 3 = 27	9 * 4 = 36	9 * 5 = 45	9 * 6 = 54	9 * 7 = 63	9 * 8 = 72	9 * 9 = 81	

代码如下：

i = 1
while i <= 9:
    j = 1
    while j <= i:
        print("{} * {} = {}".format(i, j, i * j), end="\t")
        j += 1
    print()
    i += 1

方向二：
根据下面的格式打印九九乘法表：

9 * 1 = 9	9 * 2 = 18	9 * 3 = 27	9 * 4 = 36	9 * 5 = 45	9 * 6 = 54	9 * 7 = 63	9 * 8 = 72	9 * 9 = 81	
8 * 1 = 8	8 * 2 = 16	8 * 3 = 24	8 * 4 = 32	8 * 5 = 40	8 * 6 = 48	8 * 7 = 56	8 * 8 = 64	
7 * 1 = 7	7 * 2 = 14	7 * 3 = 21	7 * 4 = 28	7 * 5 = 35	7 * 6 = 42	7 * 7 = 49	
6 * 1 = 6	6 * 2 = 12	6 * 3 = 18	6 * 4 = 24	6 * 5 = 30	6 * 6 = 36	
5 * 1 = 5	5 * 2 = 10	5 * 3 = 15	5 * 4 = 20	5 * 5 = 25	
4 * 1 = 4	4 * 2 = 8	4 * 3 = 12	4 * 4 = 16	
3 * 1 = 3	3 * 2 = 6	3 * 3 = 9	
2 * 1 = 2	2 * 2 = 4	
1 * 1 = 1	

代码如下：

i = 9
while i >= 1:
    j = 1
    while j <= i:
        print("{} * {} = {}".format(i, j, i * j), end="\t")
        j += 1
    print()
    i -= 1