Kotlin Program: Check a number positive, negative, or zero

Last update on February 04 2025 08:04:05 (UTC/GMT +8 hours)

Write a Kotlin program to check if a given number is positive, negative, or zero.

Pre-Knowledge (Before you start!)

• Basic Kotlin Syntax.
• Kotlin Functions.
• Variables in Kotlin.
• Conditional Statements.
• Comparison Operators.
• String Interpolation.
• Printing Output.

Hints (Try before looking at the solution!)

• Define the main() Function.
• Declare a Number Variable.
• Display the Number.
• Use Conditional Statements.
• Test with Different Numbers.
• Common Errors to Avoid:
  • Forgetting to handle zero.
  • Misplacing logic in if-else statements.
  • Using assignment instead of comparison.

Sample Solution:

Kotlin Code:

fun main() 
 {
      val number = 1
    //val number = -4
    //val number = 0

    println("Number is: $number")
        if (number > 0) 
          {
            println("The number is positive.")
          } 
         else if (number < 0) 
          {
            println("The number is negative.")
          } 
          else 
          {
            println("The number is zero.")
          }
   }

Sample Output:

Input a number:
Number is: 1.0
The number is positive. 

 
Number is: -4
The number is negative.

 
Number is: 0
The number is zero.

Explanation:

In the above exercise,

• If the number is greater than 0, it is considered positive, and the corresponding message is printed.
• If the number is less than 0, it is considered negative, and the corresponding message is printed.
• If the number is neither greater nor less than 0, it must be 0, and the corresponding message is printed.

Kotlin Editor:

Previous: Kotlin Control Flow Exercises Home.
Next: Check number divisibility by 7.