自学训练营学习13群+1901100192+day2作业！

exercises/1901100192/1001S02E02_hello_python.py

@@ -0,0 +1,2 @@
+print ('hello，world')
+print ('nice to meet you')

exercises/1901100192/1001S02E03_calculator.py

@@ -0,0 +1,19 @@
+operator = input('请输入运算符号(+, -, *, /) : ')
+first_number = input('请输入第一个数字: ')
+second_number = input('请输入第二个数字 : ')
+
+a = int(first_number)
+b = int(second_number)
+
+if operator == '+':
+    print(a, '+', b, '=', a + b)
+elif operator == '-':
+    print(a, '-', b, '=', a - b)  
+elif operator == '*':
+    print(a, '*', b, '=', a * b)  
+elif operator == '/':
+    print(a, '/', b, '=', a / b)
+else:
+    print('Null operator')
+
+

exercises/1901100192/1001S02E04_control_flow.py

@@ -0,0 +1,19 @@
+
+
+for n in range(1, 10):
+    for m in range(1, n+1):
+        print("%d*%d=%2d" % (n,m,n*m), end ="   ")
+    print()
+
+    n = 1
+while n <= 9:
+    m = 1
+    while m <= n:
+        if n % 2 > 0: 
+            print("%d*%d=%d\t" % (n, m, n*m),end='')
+        m += 1
+    if n % 2 != 0: 
+        print()    
+    n += 1
+
+

exercises/1901100192/README.md

@@ -1 +1,6 @@
-# hello-world
+
+# hello-world
+#very good
+
+# hello-world
+