DEV Community: Vinoth Kumar

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Vinoth Kumar — Wed, 19 Aug 2026 17:40:45 +0000

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Vinoth Kumar — Tue, 18 Aug 2026 18:05:57 +0000

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Vinoth Kumar — Mon, 17 Aug 2026 18:21:31 +0000

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Vinoth Kumar — Sun, 16 Aug 2026 16:43:50 +0000

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Vinoth Kumar — Sat, 15 Aug 2026 17:01:41 +0000

TODAY SOLVED PROBLEMS PY

Vinoth Kumar — Fri, 14 Aug 2026 17:50:03 +0000

Q1)Write a program that takes a number from the user and prints whether it is prime or not prime.

SOLN-1 PYTH:

n = 1319
d = 2
while d <= n//2:
    if n%d == 0:
        print('not a prime')
    d+=1
else:
    print(d)
    print('prime')

In the name of 'n' variable is used to store the value which is '1319', and in another variable name 'd' to store the value '2'.
Here,i am used while loop to check the condition d<=n//2 which is d=2->.
If 2<=1319 then it's get into the loop and check another condition which i given inside the loop is another 'if'.
To check 1319%2 == 0 if this condition satisfied then i used to print('not a prime).

SOLN-2 :

n = 1319
d=2
while d<n:
    if n%d ==0:
        print('not a prime')
        break
    d+=1
else:
    print(n)
    print('prime')

SOLN-3 :

p=7
d=2
if d%p == 0:
    print('not a prime')
    d+=1
else:
    print(d)
    print('prime')

PYTHON SOLVED PROBLEMS

Vinoth Kumar — Thu, 13 Aug 2026 17:09:56 +0000

Q1) Two trains stop at regular intervals:
Train 1 stops at every 3rd station.
Train 2 stops at every 5th station.
Find:
The first common station where both trains stop.
The last common station where both trains stop.
All common stations where both trains stop.

Note: Total Number of Stations are unknown.

SOLUTION :

station = 1
last_station = station
while station <= 15:
    if station % 3 == 0 and station % 5 == 0:
        print(station)
        print('First common station: ', station)
        break
    station+=1

OUTPUT :

15
First common station:  15

SOLUTION 2:

let station=15;
let last_station = station;
while (station <=15){
if(station % 3 == 0 & station % 5 ==0 ){
console.log(station);
}
last_station =station;
console.log('first common station: ',station)
station+=1;
}




**OUTPUT :**

![ ](https://dev-to-uploads.s3.us-east-2.amazonaws.com/uploads/articles/m4jr79sevqfq37h6t11z.png)

PYTHON PROBLEMS

Vinoth Kumar — Wed, 12 Aug 2026 17:24:52 +0000

MODULE 1 :

Note: Total Number of Stations are unknown.

station = 1
last_station = station
while station <= 15:
    if station % 3 == 0 and station % 5 == 0:
        print(station)
        print('First common station: ', station)
        break
    station+=1

SET OPERATION

Vinoth Kumar — Tue, 11 Aug 2026 17:06:27 +0000

SET OPERATION :

A collection of distinct objects. These objects can be numbers, letters, people, or any other identifiable items.

TYPES OF SET OPERATION :

UNION.
INTERSECTION.
SET DIFFERENCE.
SYMMETRIC DIFFERENCE.

UNION :

Set of distinct elements that belong to set A or set B, or both.

NEXT DAY

Vinoth Kumar — Mon, 10 Aug 2026 17:32:26 +0000

LIBRARIES IN PYTHON

Vinoth Kumar — Sun, 09 Aug 2026 17:35:38 +0000

LIBRARIES IN PY :
A group of modules that contain functions, classes and methods to perform common tasks like data manipulation, math operations, web scraping and more.

TYPES OF LIBRARIES :

Built-in Python Standard Library.
External Python Libraries.

BUILD-IN PY LIBRARIES :

A collection of modules that come bundled with every Python installation, we don’t need to install anything separately.

math.
os.
datetime.
random.
json.

EXTERNAL PY LIBRARIES :

External libraries are not included with Python by default. You can install them easily using the pip package manager.

NumPy.
Pandas.
Matplotlib.
SciPy.
TensorFlow.

FULL JOIN

Vinoth Kumar — Sat, 08 Aug 2026 14:46:04 +0000

FULL JOIN :
SQL returns all rows from both tables, combining matched rows and filling unmatched rows with NULL values. It is basically the combination of LEFT JOIN and RIGHT JOIN.

SYNTAX :

SELECT columns FROM table1 FULL JOIN table2 ON table1.column = table2.column;