Final Exam.2

Python:

-Question 1: length of string

-Correct Solution: {

def string_len(str):

count = 0    

for i in str: 

    count += 1


return count

}

-Question tip:

-Question 2:copying a string in a buf

-Correct Solution:

-Question tip:

-Question 3:counting a character in a string

-Correct Solution:

{

def char_count(pch,a):

d=string_len(pch)

c=0

for i in range (d):

    if (pch[i] == a ):

        c=c+1 
 

return c

}

-Question 4: counting longest sequence of a character

-Correct Solution:

-Question tip:

-Question 5: counting a pattern of characorts in a stirng

-Correct Solution:

def count_pattern (arr , cd ):

n=len(arr)

m= len(cd)

s=0

for i in range(n-m+1):

    p=""

    for j in range(i,i+m):

        p+= arr[j]

        if(p== cd ):

            s+= 1

print (s)


return s

-Question tip: مهم ترین قسمت سوال پیدا کردن درست از بازه های مناسب برای حلقه هاست

-Question 6:applying a function

-Correct Solution:

-Question tip:

-Question 7:changing a class

-Correct Solution:

def init(self, id, name):

   self.id = id

   self.name = name

class student:

def init(self, id, name):

   self.id = id

   self.name = name

def ghange_student_name (s , name ):

s.name = name 

def changge_stident_id (s,id ):

s.id = id 

-Question tip: چگونگی تعریف یک کلاس درون تابع

-Question 8: converting a class to string

-Correct Solution:

def student_tostring(s):

p=""

p+= s.id 

p+=':'

p+=s.name 

print(p)

return p 

-Question tip: چگونگی استفاده از کلاس در یک تابع

-Question 9:creating a class

-Correct Solution:

def create_student(id, name):

p= student(id , name )



print(p.id , p.name)

return(p.id , p.name)

-Question tip:

• 2019 2
• 2016 4