update homework 3 and 4

Author: alvinhuu

D03/homework.py

@@ -15,5 +15,5 @@ def db2V1(db):
 print('30db\'s V1 is %d' % V30db)
 print('50db\'s V1 is %d' % V50db)
 
-print('30 分貝的聲壓會是 50 分貝的幾倍 = {:.3f}'.format(V30db/V50db) )
+print('30 分貝的聲壓會是 50 分貝的幾倍 = %s' % (V30db/V50db) )
 

D04/homework.py

@@ -0,0 +1,18 @@
+import numpy as np
+
+english_score = np.array([55,89,76,65,48,70])
+math_score = np.array([60,85,60,68,55,60])
+chinese_score = np.array([45,90,82,72,66,77])
+
+#1.有多少學生英文成績比數學成績高?
+ans1 = np.greater(english_score,math_score)
+# print(ans1)
+Ans = [ A for A in ans1 if A==True ]
+print('有 %d 個學生英文成績比數學成績高' % len(Ans))
+
+#2.是否全班同學最高分都是國文?
+ans2 = np.greater(chinese_score,english_score,math_score )
+# print(ans2)
+Ans = [ A for A in ans2 if A==1 ]
+print('是否全班同學最高分都是國文: %s' % ( len(Ans)==6) )
+