一、首先用“ * ”编写直角三角形,编写10行,每一行“ * ”的个数等于行数,分析结果图如下所示:
* 1---》1 内循环执行一次
* * 2---》2 内循环执行两次
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
如上图所示,编写程序:
for i in range(1,10): #行数
for j in range(1,i+1): # 每行*的个数与行数相等
print('*',end='\t')
print()
程序运行结果为:
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
二、根据所得到的的直角三角形,将“ * ”替换,得到九九乘法表,修改代码为:
for i in range(1,10): #行数
for j in range(1,i+1): # 每行*的个数与行数相等
print(i,'*',j,'=',i*j,end='\t')
print()
输出最终结果为:
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