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