Course
Introduction
Print an Integer (Entered by the User)Add Two IntegersMultiply two Floating Point NumbersFind ASCII value of a characterCompute Quotient and RemainderSwap Two NumbersCheck Whether a Number is Even or OddFind the Frequency of Character in a StringRemove All Whitespaces from a StringRound a Number to n Decimal PlacesDecision Making and Loop
Check Whether an Alphabet is Vowel or ConsonantFind the Largest Among Three NumbersFind all Roots of a Quadratic EquationCheck Leap YearCheck Whether a Number is Positive or NegativeCheck Whether a Character is Alphabet or NotCalculate the Sum of Natural NumbersFind Factorial of a NumberGenerate Multiplication TableDisplay Fibonacci SeriesFind GCD of two NumbersFind LCM of two NumbersDisplay Characters from A to Z using loopCount Number of Digits in an IntegerReverse a NumberCalculate the Power of a NumberCheck Whether a Number is Palindrome or NotCheck Whether a Number is Prime or NotDisplay Prime Numbers Between Two IntervalsCheck Armstrong NumberDisplay Armstrong Number Between Two IntervalsDisplay Factors of a NumberMake a Simple Calculator Using switch...caseCount the Number of Vowels and Consonants in a SentenceSort Elements in Lexicographical Order (Dictionary Order)Create Pyramid and PatternFunctions
Display Prime Numbers Between Intervals Using FunctionDisplay Armstrong Numbers Between Intervals Using FunctionCheck Whether a Number can be Expressed as Sum of Two Prime NumbersFind the Sum of Natural Numbers using RecursionFind Factorial of a Number Using RecursionFind G.C.D Using RecursionConvert Binary Number to Decimal and vice-versaConvert Octal Number to Decimal and vice-versaConvert Binary Number to Octal and vice-versaReverse a Sentence Using Recursioncalculate the power using recursionArrays
Calculate Average Using ArraysFind Largest Element in an ArrayCalculate Standard DeviationAdd Two Matrix Using Multi-dimensional ArraysMultiply to Matrix Using Multi-dimensional ArraysMultiply two Matrices by Passing Matrix to a FunctionFind Transpose of a MatrixPrint an ArrayConcatenate Two ArraysConvert Character to String and Vice-VersaCheck if An Array Contains a Given ValueCollections
Join Two ListsConvert List (ArrayList) to Array and Vice-VersaConvert Map (HashMap) to ListConvert Array to Set (HashSet) and Vice-VersaSort a Map By ValuesObject and Class
Add Two Complex Numbers by Passing Class to a FunctionCalculate Difference Between Two Time PeriodsAdvanced
Convert String to DateGet Current Date/TImeConvert Milliseconds to Minutes and SecondsAdd Two DatesGet Current Working DirectoryConvert Byte Array to HexadecimalCreate String from Contents of a FileAppend Text to an Existing FileConvert a Stack Trace to a StringConvert File to byte array and Vice-VersaConvert InputStream to StringConvert OutputStream to StringLookup enum by String valueCompare StringsSort ArrayList of Custom Objects By PropertyCheck if a String is NumericKotlin Program to Check Whether a Number is Positive or Negative
Logic to solve this problem:
- If the number is greater than zero, it is a positive number.
- If the number is less than zero, it is a negative number.
- If both conditions are not satisfied, the number is zero.
Example 1: Using if…else statement
fun main(args: Array<String>) {
val number = 12.3
if (number < 0.0)
println("$number is a negative number.")
else if (number > 0.0)
println("$number is a positive number.")
else
println("$number is 0.")
}
When you run the program, the output will be:
12.3 is a positive number.
Here’s the equivalent Java code: Java Program to Check if a Number is Positive or Negative.
We can also use a when expression instead of an if...else expression to solve this problem.
Example 2: Using when expression
fun main(args: Array<String>) {
val number = -12.3
when {
number < 0.0 -> println("$number is a negative number.")
number > 0.0 -> println("$number is a positive number.")
else -> println("$number is 0.")
}
}
When you run the program, the output will be:
-12.3 is a negative number.