#
# For loop in strings and lists practice - Practice
#
# Part I - Scanning values and repetition 
# 

# Preliminary notes: 
- Presumed knowledge:
  - That practiced in pervious videos 
  - Basic structure of strings, lists
  - for loop 
  - The functions range(), length(), eval() 
  - The operators in, *, + 
- Relation to tuples 
- Use only the studied material.
  In particular do not use type functions 


# INTRODUCTORY REMARK ABOUT THE NATURE OF
# THE FOR LOOP AND ABOUT ITS KINDS 

98, 73, 52, 61
0   1   2   3


# NOW TO THE QUESTIONS 


# SCANNING VALUES 

# Q. 1
# Write a program that receives any string 
# and prints all its characters, 
# one by one, each in a different line.  

s = input("Please enter any string: ")
for c in s:
    print(c)
    
Python 
c = 'P'
c = 'y'
c = 't'
c = 'h'
c = 'o'
c = 'n'


# Q. 2
# Write a program that receives any string 
# and prints its length. Do not use the function
# length(). 

s = input("Please enter any string: ")
counter = 0 
for c in s: 
    counter = counter + 1
print(counter)

'Python'





# Q. 3 
# Write a program that receives an non-negative integer 
# and prints the sum of digits comprising it. 

num = input("Please enter any non-negative integer: ")
sumNums = 0 
for digit in num: 
    sumNums = sumNums + int(digit) 
print(sumNums)

972 






# Q. 4
# Write a program that receives an integer non-negative i 
# and a string s, and prints the character 
# found in index i in s. If i is not a valid 
# index in s the programm issues a proper message. 
# Do not use the [ ] operator 

s = input("Please enter any string: ")
i = int(input("Please enter a non-netative integer: ")) 
if i <= (len(s) - 1): 
    counter = 0 
    for c in s:
        if counter == i: 
            print(c)
        counter = counter + 1 
else: 
    print("Invalid index.")


s = "Bisli"

'B' 'i' 's' 'l' 'i'
 0   1   2   3   4 






# Q. 5
# Write a program that receives two integers, 
# i and j, as well as a string s. 
# The program prints the substring of s
# beginning in the index i and ends 
# in the index j. Each character of the 
# substring is printed in a separate line. 



s = input("Please enter any string: ")
i = int(input("Please enter a non-netative integer: ")) 
j = int(input("Please enter a non-netative integer: ")) 
counter = 0 
for c in s: 
    if counter >= i and counter <= j: 
        print(c)
    counter = counter + 1 

"Banana"
 012345
 
 Bamba
 01234





# Q. 6
# Write a program that recieves any string
# and a character (string of length 1), and 
# prints True if the character is in the string, 
# False otherwise. Do not use the in operator. 

s = input("Please enter any string: ")
yourC = input("Please enter any character: ")
result = False
for c in s:
    if c == yourC: 
        result = True 
print(result)


print("X" in "bamba")









# Q. 7
# Write a program that receives two strings, 
# s1 and s2, and prints all characters common
# to the two strings. If there are no such 
# characters an empty string is printed. 

s1 = input("Please enter any string: ")
s2 = input("Please enter any string: ")
for c in s1: 
    if c in s2: 
        print(c)

"Bamba"
"BOmba"


# without using in 
s1 = input("Please enter any string: ")
s2 = input("Please enter any string: ")
for c1 in s1: 
    result = False
    for c2 in s2:
        if c1 == c2: 
            result = True 
    if result == True
        print(c1)





# Q. 8 
# Write a program that receives two strings, 
# s1 and s2. The program prints a string
# including all characters found in s1 
# but not in s2. If there are no such 
# characters an empty string is printed. 


s1 = input("Please enter any string: ")
s2 = input("Please enter any string: ")
found = False 
for c in s1: 
    if c not in s2: 
        print(c)
        found = True 
if not found: 
    print("")
        
        


'BObma'
'Bamba'


# Q. 9 
# Write a program that receives a string 
# comprising only English words and spaces and 
# prints the number of upper-case letters
# in the string. 

words = input("Please enter words serpated by spaces: ")
counter = 0 
for c in words:
    if c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ": 
        counter = counter + 1 
print("Number of upper-case letters: ", counter)
  
 
I Have a dream 





# Q. 10
# Write a program that receives any list, 
# and prints the values in the list, one 
# after another, each in a separate line. 
lst = eval(input("Please enter a list: "))
for item in lst: 
    print(item)


lst = eval(input("Please enter a list: "))
print(type(lst))
print(lst)

[3, 4, 5]


# Q. 11
# Write a program that prints all numbers in range 
# 1-10 (including 10), each number in a different line. 

for num in range(1, 11): 
    print(num)





lst = list(range(2, 6))
print(lst)





# Q. 12
# Write a program that calculates and prints the square 
# of all integers in range 1-10 (including 10). 

for num in range(1, 11): 
    print(num ** 2)







# Q. 13
# Write a program that receives an integer n 
# bigger than 2, and prints the remindars 
# resulting from dividing n by all numbers in 
# range 1 to n-1. 

n = int(input("Please enter an integer greater than 2: "))
for num in range(1, n): 
    print(n % num)
    
n == 5 
1 2 3 4 
0 1 2 1
    
    
    



# Q. 14
# Write a program that receives a list of integers, 
# and finds how many of them are bigger than 3. 

lst = eval(input("Please enter a list of integers: "))
counter = 0 
for num in lst: 
    if num > 3: 
        counter = counter + 1 
print("Number of integers greater than 3:", counter)



# Q. 15
# Write a program that receives a list of integers, 
# and calculates their average. 

lst = eval(input("Please enter a list of integers: "))
counter = 0 
sumNums = 0 
for num in lst:
    sumNums = sumNums + num
    counter = counter + 1 
print("Average is: ", sumNums / counter)






# Q. 16
# Write a program that receives a list of integers, 
# and finds the biggest. 
# Do not use the function max(). 

lst = eval(input("Please enter a list of non-negative integers: "))
maxNum = 0 
for num in lst:
    if num > maxNum: 
        maxNum = num 
    print(maxNum)
print("Masimun number is: ", maxNum)





# Q. 17
# Write a program that receives a list 
# of integers smaller than 100, and finds the 
# smallest even integer. if no even integer 
# exists in the list the program prints -1. 

lst = eval(input("Please enter a list of integers smaller than 100: "))
minNum = 99
for num in lst:
    if num % 2 == 0 and minNum > num: 
        minNum = num
print("Minimal number is:", minNum)

2 3 4 



# REPETITION 
n = int(input("Please enter any positive integer: "))
for i in range(n): 
    print("Kolargol")
    print("Procidis")


# Q. 18
# Write a program that produces 20 random numbers
# in range 0-100 (including 100), and prints them all. 

import random 
for i in range(20): 
    print(random.randint(0, 100)) 




Q. 19
Write a program that receives two positive integers
represeting the sides of a ractange, and then draws
the rectangle using *s, E.g. if the integers are 
5 and 4 the program prints: 
****
*  *
*  *
*  *
****

# version 1 
side1 = int(input("Please enter a positive integer: "))
side2 = int(input("Please enter a positive integer: "))
print("*" * side2)
for i in range(side1 - 2):
    print("*", end = "")
    for j in range(side2 -2): 
        print(" ", end = "")    
    print("*", end = "")
    print()
print("*" * side2)


# version 2 
side1 = int(input("Please enter a positive integer: "))
side2 = int(input("Please enter a positive integer: "))
print("*" * side2)
for i in range(side1 - 2):
    print("*" + " " * (side2 - 2) + "*")    
print("*" * side2)



print("b" + "x")


for i in range(side2): 
    print('*', end = "")

print(3, end = "")
print(4)