Math.round vs Math.floor vs Math.ceil : Kotlin

This post was originally posted at https://agrawalsuneet.github.io/blogs/math-round-vs-math-floor-vs-math-ceil-kotlin/ and reposted on Medium on 13th April 2022.

Math.round()

  • Math.round rounds up to the nearest Integer which can be above or below or even equal to the actual value.
  • In the case of a positive number, anything which is equal to or below x.49 will be converted to a lower number ie x.00 whereas anything which is equal to or more than x.5 will be converted to a higher number ie x+1.00
  • In the case of a negative number, anything which is equal to or below -x.51 will be converted to a lower number ie -x-1.00 whereas anything which is equal to or more than -x.5 will be converted to a higher number ie -x.00
println(Math.round(3.00))
//this will print: 3
println(Math.round(3.49))
//this will print: 3
println(Math.round(3.5))
//this will print: 4
println(Math.round(-3.00))
//this will print: -3
println(Math.round(-3.5))
//this will print: -3
println(Math.round(-3.51))
//this will print: -4

Math.floor()

  • Math.floor rounds up to the nearest Integer which can be equal to or below the actual value.
  • In the case of a positive number, anything between x.01 to x.99 will be converted to a lower number ie x.00 whereas x.00 will remain the same x.00
  • In the case of a negative number, anything between -x.01 to -x.99 will be converted to a lower number ie -x-1.00 whereas -x.00 will remain the same -x.00
println(Math.floor(3.00))
//this will print: 3
println(Math.floor(3.01))
//this will print: 3
println(Math.floor(3.99))
//this will print: 3

println(Math.floor(-3.00))
//this will print: -3
println(Math.floor(-3.01))
//this will print: -4
println(Math.floor(-3.99))
//this will print: -4

Please continue reading at https://agrawalsuneet.github.io/blogs/math-round-vs-math-floor-vs-math-ceil-kotlin/

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