Basics

1. Print Hello World!
   Java | C Language | C++ | Python | C# | Go | JavaScript | Kotlin | Ruby
2. Print a multiline Hello World!
   Java | C Language | C++ | Python | C# | Go | JavaScript | Kotlin | Ruby
3. Scan name of user and say hello with name
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
4. Take age and tell whether its infant or child or adult
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
5. Take a character and tell its vowel or consonant
   Java | C Language | C++ | Python | C# | Go | JavaScript
6. Print numbers from 1 to 10 using for loop
   Java | C Language | C++ | Python | C# | Go | JavaScript
7. Print numbers from 1 to 10 using while loop
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
8. Take birth year and tell age
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
9. Take a number between 0 to 9 and print the word representation for that number
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
10. Take a max limit from user and generate a random number till that number
    Java | C Language | C++ | Go | JavaScript
11. Generate random string
    Java | JavaScript
12. Show current time in milliseconds
    Java
13. Show current day
    Java
14. Print present year
    Java
15. Print present month
    Java
16. Print present date
    Java
17. Show current time in seconds
    Java

Basic Math

1. Take two numbers from user and add those two numbers
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
2. Find largest number from given 2 numbers
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
3. Find largest number from given 3 numbers
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
4. Print table for given number
   Java | C Language | C++ | Python | C# | Go | JavaScript
5. Take a year as input and tell whether it's a leap year or not
   Java | C Language | C++ | C# | Go | JavaScript
6. Multiply given two numbers
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
7. Take a number as input and tell its positive or negative
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
8. Take a number as input and calculate the square of that number
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
9. Take a number as input and calculate the square root of given number
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
10. Take a number as input and tell its even or odd number
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
11. Take a number as input and tell its a Prime number or not
12. Average of given 3 numbers
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
13. Average of given n Numbers
14. Print tables from 1 to 20
    Java | C Language | C++ | C# | Go | JavaScript
15. Calculate interest
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
16. Print fibonacci series
17. Sum of n natural numbers
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
18. Factorial of given number
    Java | C Language | C++ | Python | C# | Go | JavaScript
19. Calculate discount
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
20. Calculate salary hike
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby

Math - geometry

1. How to calculate triangle area
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
2. How to calculate triangle circumference
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
3. How to calculate rectangle area and circumference
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
4. How to calculate trapezoid area
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
5. How to calculate trapezoid circumference
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
6. How to calculate parallelogram area
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
7. How to calculate parallelogram circumference
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
8. How to calculate circle area
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
9. How to calculate circle circumference
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
10. How to calculate square area and circumference
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby

Note: (Refer https://www.science.co.il/formula/ )

Math - Unit conversions

1. Fahrenheit to celsius
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
2. centimeters to millimeters
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
3. millimeters to centimeters
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
4. feet to inches
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
5. inches to feet
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
6. kilometers to miles
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
7. miles to kilometers
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
8. grams to kilograms
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
9. kilograms to grams
   Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
10. days to hours
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
11. hours to seconds
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
12. hours to milliseconds
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
13. days to seconds
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
14. hours to minutes
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
15. days to milliseconds
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
16. dollars to rupees
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby
17. rupees to dollars
    Java | C Language | C++ | Python | C# | Go | JavaScript | Ruby

String operations

1. Find length of a string
   Java | C Language | C# | Go | JavaScript | Ruby
2. Convert given string to lower case
   Java | C# | Go | JavaScript | Ruby
3. Join two given strings
   Java | C Language | C# | Go | JavaScript | Ruby
4. Replace spaces with hyphen in a string
   Java | C# | Go | JavaScript | Ruby
5. Find the occurrences of a character in a String
6. Compare two strings are equal or not
   Java | C# | Go | JavaScript | Ruby
7. Compare two strings are equal by ignoring the case
   Java | C# | Go | JavaScript | Ruby
8. Print character at given index in a given string
   Java | C# | Go
9. Find the index of a particular character in a given string
   Java | C# | Go | JavaScript
10. Print given string in reverse order
    Java | C# | JavaScript
11. Convert given string to upper case
    Java | C# | Go | JavaScript | Ruby

Shapes

1. Print Pyramid with stars
2. Print Pyramid with numbers
3. Print Pyramid with alphabets
4. Print Reverse Pyramid with stars
5. Print Reverse Pyramid with numbers
6. Print Reverse Pyramid with alphabets
7. Print hollow Pyramid with stars
8. Print hollow Pyramid with numbers
9. Print hollow Pyramid with alphabets
10. Print Reverse hollow Pyramid with stars
11. Print Reverse hollow Pyramid with numbers
12. Print Reverse hollow Pyramid with alphabets
13. Print Square shape with stars
    Java
14. Print Square shape with numbers
    Java
15. Print Square shape with alphabets
    Java

Files

1. Create a file with a name
2. Write content to file
3. Rename a file
4. Read content from a file
5. Check size of a file
6. Get File created data and last modified date
7. List files in a folder
8. Create a folder
9. Rename folder
10. Delete a folder

Difficult

1. Reverse a number
2. Check given number Palindrome or not
3. Check given number Armstrong number or not
4. Average of given n numbers
5. Find most repeated word from a file