1901100191_day4_13群

exercises/1901100191/1001S02E03_calculator.py

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+operator = input('请输入运算符（+、-、*、/):')
+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)
+
+print('operator:', operator, type(operator))
+print('first_number:', first_number, type(first_number))
+print('second_number:', second_number, type(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('无效运算符'）

exercises/1901100191/1001S02E04_control_flow.py

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+print('九九乘法运算')
+for i in range(1,10):
+    for j in range(1,10):
+        print(j,'×',i,'=',i*j, end="\t")
+    print("")
+
+
+print('九九乘法运算')
+for a in range(1,10,2):
+    for b in range(1,10,2):
+        print(b,'×',a,'=',a*b, end="\t")
+    print("")
+
+print('九九乘法运算')
+for c in range(1,10):
+    for d in range(1,c+1):
+        while c % 2 !=0:
+            print(d,'×',c,'=',c*d, end="\t")
+            if c == d:
+                print("")
+            break