added more questions

xcao21 · xcao21 · commit 728050633052 · 2012-06-16T09:43:41.000-04:00
diff --git a/100+ Python challenging programming exercises.txt b/100+ Python challenging programming exercises.txt
@@ -1548,6 +1548,9 @@ Then, the output of the program should be:
 
 In case of input data being supplied to the question, it should be assumed to be a console input.
 
+Hints:
+Use float() to convert an integer to a float
+
 Solution:
 
 n=int(raw_input())
@@ -1579,6 +1582,9 @@ Then, the output of the program should be:
 
 In case of input data being supplied to the question, it should be assumed to be a console input.
 
+Hints:
+We can define recursive function in Python.
+
 Solution:
 
 def f(n):
@@ -1592,26 +1598,159 @@ print f(n)
 
 #----------------------------------------#
 
+8
+
+The Fibonacci Sequence is computed based on the following formula:
 
 
+f(n)=0 if n=0
+f(n)=1 if n=1
+f(n)=f(n-1)+f(n-2) if n>1
+
+Please write a program to compute the value of f(n) with a given n input by console.
+
+Example:
+If the following n is given as input to the program:
+
+7
+
+Then, the output of the program should be:
+
+13
+
+In case of input data being supplied to the question, it should be assumed to be a console input.
+
+Hints:
+We can define recursive function in Python.
+
+
+Solution:
+
+def f(n):
+    if n == 0: return 0
+    elif n == 1: return 1
+    else: return f(n-1)+f(n-2)
+
+n=int(raw_input())
+print f(n)
 
 
 #----------------------------------------#
 
+#----------------------------------------#
+
+8
+
+The Fibonacci Sequence is computed based on the following formula:
+
+
+f(n)=0 if n=0
+f(n)=1 if n=1
+f(n)=f(n-1)+f(n-2) if n>1
+
+Please write a program using list comprehension to print the Fibonacci Sequence in comma separated form with a given n input by console.
+
+Example:
+If the following n is given as input to the program:
+
+7
+
+Then, the output of the program should be:
+
+0,1,1,2,3,5,8,13
+
+
+Hints:
+We can define recursive function in Python.
+Use list comprehension to generate a list from an existing list.
+Use string.join() to join a list of strings.
+
+In case of input data being supplied to the question, it should be assumed to be a console input.
+
+Solution:
 
+def f(n):
+    if n == 0: return 0
+    elif n == 1: return 1
+    else: return f(n-1)+f(n-2)
 
+n=int(raw_input())
+values = [str(f(x)) for x in range(0, n+1)]
+print ",".join(values)
 
 
 #----------------------------------------#
 
+8
+
+Please write a program using generator to print the even numbers between 0 and n in comma separated form while n is input by console.
+
+Example:
+If the following n is given as input to the program:
 
+10
 
+Then, the output of the program should be:
+
+0,2,4,6,8,10
+
+Hints:
+Use yield to produce the next value in generator.
+
+In case of input data being supplied to the question, it should be assumed to be a console input.
+
+Solution:
+
+def EvenGenerator(n):
+    i=0
+    while i<=n:
+        if i%2==0:
+            yield i
+        i+=1
+
+
+n=int(raw_input())
+values = []
+for i in EvenGenerator(n):
+    values.append(str(i))
+
+print ",".join(values)
 
 
 #----------------------------------------#
 
 
+8
+
+Please write a program using generator to print the numbers which can be divisible by 5 and 7 between 0 and n in comma separated form while n is input by console.
+
+Example:
+If the following n is given as input to the program:
+
+100
+
+Then, the output of the program should be:
+
+0,35,70
+
+Hints:
+Use yield to produce the next value in generator.
+
+In case of input data being supplied to the question, it should be assumed to be a console input.
+
+Solution:
 
+def NumGenerator(n):
+    for i in range(n+1):
+        if i%5==0 and i%7==0:
+            yield i
+
+n=int(raw_input())
+values = []
+for i in NumGenerator(n):
+    values.append(str(i))
+
+print ",".join(values)
 
 
 #----------------------------------------#
