## Identical vs Equal

• == is used to verify value equality
• is is used to verify variable ids are same or not (Identical)

### Some important functions for our survival

• Till now we know
• type()
• id()
• print()
• Today lets add two more
• input(): This function is used to take inputs from command line
• int(): converting the values to integers

### Solving Project Euler: 1

• Refer Here for problem statement
• Informal Language/Psuedo Code:
``````1: max_number = 10
2: number1 = 3
3: number2 = 5
4: result = 0

:IMP
5: start from 1 till max_number and store in index
6:   check if index%3 == 0 | index%5 == 0 is true
7:   if its true add index to result ( result += index)
8:  index += 1
9:   Go to IMP:

``````
• If you look at statements from line 6 to 9, this should be executed for all the values from 1 to max_number and we need to take the help of looping constructs
• Now lets try to write the program with while loop Refer Here
``````max_number = 10
number1 = 3
number2 = 5
result = 0
index = 1
while index < max_number:
print('checking for index = '+ str(index))
is_divisible = (index%3 == 0 or index%5 ==0)
print('is_divisble by 3 or 5 = '+str(is_divisible))
if is_divisible:
result = result + index
print('result so far = '+str(result))
index += 1
print(result)
``````
• The improvised version is enable extra print statements on demand
``````extra_checks = True
max_number = 10
number1 = 3
number2 = 5
result = 0
index = 1
while index < max_number:
if extra_checks:
print('checking for index = '+str(index))
is_divisible = (index%3 == 0 or index%5 ==0)
if extra_checks:
print('is_divisble by 3 or 5 = '+str(is_divisible))
if is_divisible:
result = result + index
if extra_checks:
print('result so far = '+str(result))
index += 1
print(result)
``````
• Actual version of program is
``````max_number = 10
number1 = 3
number2 = 5
result = 0
index = 1
while index < max_number:
is_divisible = (index%3 == 0 or index%5 ==0)
if is_divisible:
result = result + index
index += 1
print(result)
``````
• The above program can be implemented in for
``````max_number = 10
number1 = 3
number2 = 5
result = 0
for index in range(1,max_number):
is_divisible = (index%3 == 0 or index%5 ==0)
if is_divisible:
result = result + index
print(result)
``````
``````# extra checks will print statements for verifying correctness of program
extra_checks = (input('Enter 1 for checks 0 for no checks') == '1')
# maximum number below  which the program will
# execute for every number starting from 1
max_number = 10
result = 0
for index in range(1,max_number):
if extra_checks:
print('checking for index = '+str(index))
is_divisible = (index%3 == 0 or index%5 ==0)
if extra_checks:
print('is_divisble by 3 or 5 = '+str(is_divisible))
if is_divisible:
result = result + index
if extra_checks:
print('result so far = '+str(result))
print(result)
``````

### Exercise: Write a python program to print the following

``````The current number is 1
The current number is 2
...
...
...
The current number is 100

``````

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