Merge pull request selfteaching#1903 from Autumn0808/master

Update d4_exercise_control_flow.py

Author: yjz111

19100402/Autumn0808/d4_exercise_control_flow.py

@@ -21,3 +21,15 @@
             else:
                 print(str(x)+"*"+str(y)+"="+str(x*y),end="\t")
 
+#作业2使用while循环
+m = 1
+while m <= 9:
+    n = 1
+    while n <= m:
+        print(str(m)+"*"+str(n)+"="+str(m*n),end="\t")
+        n = n + 1
+    m = m + 2
+
+
+
+