ProgramsJava

Module 1: Basic Java Programs

print, Scanner, if, a bit of math. Week-one Java. Skip ahead if this is slow.

20 programs · open one, then the next

Start with Hello World
  1. 01Hello WorldBeginnerOne println inside main. If this runs, javac worked.Open example →
  2. 02Add Two NumbersBeginnerScanner gives numbers. Forget nextDouble() and you are concatenating strings.Open example →
  3. 03Swap Two NumbersBeginnerSwap the values of two variables using a temporary variable.Open example →
  4. 04Find ASCII Value of a CharacterBeginnerRead a character and print its ASCII value.Open example →
  5. 05Even or Odd NumberBeginnerCheck whether a given integer is even or odd.Open example →
  6. 06Largest of Two NumbersBeginnerFind the largest of two numbers using if-else.Open example →
  7. 07Largest of Three NumbersBeginnerFind the largest of three numbers using conditional statements.Open example →
  8. 08Positive or Negative NumberBeginnerCheck whether a number is positive, negative, or zero.Open example →
  9. 09Area of CircleBeginnerCalculate the area of a circle given its radius.Open example →
  10. 10Area of RectangleBeginnerCalculate the area of a rectangle given its length and breadth.Open example →
  11. 11Area of TriangleBeginnerCalculate the area of a triangle using base and height.Open example →
  12. 12Simple InterestBeginnerCalculate simple interest given principal, rate, and time.Open example →
  13. 13Compound InterestIntermediateCalculate compound interest using principal, rate, time, and compounding frequency.Open example →
  14. 14Celsius to FahrenheitBeginnerConvert temperature from Celsius to Fahrenheit.Open example →
  15. 15Sum of N Natural NumbersBeginnerCalculate the sum of first N natural numbers using formula.Open example →
  16. 16Power without Math.pow()BeginnerCompute a^b using a loop instead of Math.pow().Open example →
  17. 17ASCII to CharacterBeginnerConvert an integer ASCII code to its corresponding character.Open example →
  18. 18Character to ASCIIBeginnerConvert a character to its ASCII code.Open example →
  19. 19Convert Seconds to Hours and MinutesBeginnerConvert total seconds into hours, minutes, and remaining seconds.Open example →
  20. 20Gross Salary CalculationBeginnerCalculate gross salary using basic salary, HRA, and DA.Open example →