#CS 0008: Spring 2015 Lab 3
#YOUR NAME:                        
#
#YOUR PARTNER'S NAME:
#
#To get credit on this lab, attend recitation, work with your partner to answer the questions, and give "reasonable" (if not all correct) answers.  Each of you should hand in a hardcopy of your own  solution, due at the beginning of next week's recitation.

#For this lab, you will write 4 string functions. The last two do the
#same thing.  You should write two different versions of the same function.  
#
#Recall in stringFuns.py, a program covered in class on 1/27, function "grade" was included, and the functions are tested by calling them like this:

#  grade(numVowels('hello there fellow'), 6)

#"grade" is included below, along with a function "main" with test
# cases already defined for you.  In the future, we'll ask you to define your own test functions.

def count(c,s):
   '''c is a character and s is a string.   Return the number of 
      times (an int) that c appears in s. 
      Eg:  count('a','Anna') returns 1'''

def replace(old,new,s):
   '''old and new are characters and s is a string.  Return a 
      copy of s with all occurrences of old replaced by new.
      Eg: replace('i','o','Million') returns 'Molloon' '''

# Hint for the following functions:  a return inside the loop and/or a boolean
#  variable can be helpful.  If you can only get one version,
#  that's ok - you will pass the lab if you only come up with one.
#

def contains1(c,s):
    '''c is a char and s is a str.   Return True if s contains c
       and false otherwise. '''

def contains2(c,s):
    '''c is a char and s is a str.   Return True if s contains c
       and false otherwise. '''

def grade(myAns,correctAnswer):
   if myAns == correctAnswer:
       print("Correct, the answer is",myAns)
   else:
       print("My answer is",myAns,"but the correct answer is",correctAnswer)

def main():
   grade(count('n','Anna'),2)
   grade(count('n','computer'),0)   
   grade(count('a','a'),1)
   grade(count('a',''),0)
   grade(count('a','baaaaaaa'),7)

   grade(replace('i','o','Million'),'Molloon')
   grade(replace('z','o','Million'),'Million')
   grade(replace('i','o','i'),'o')
   grade(replace('i','o',''),'')

   grade(contains1('c','hello'),False)
   grade(contains1('e','hello'),True)
   grade(contains1('h','hello'),True)
   grade(contains1('o','hello'),True)

   grade(contains2('c','hello'),False)
   grade(contains2('e','hello'),True)
   grade(contains2('h','hello'),True)
   grade(contains2('o','hello'),True)

main()