IEEE754.scala

#!/usr/bin/env -S scala-cli shebang -S 3

/**
 * https://www.doc.ic.ac.uk/~eedwards/compsys/float/
 */

import java.{ lang => j }

val n = args(0).toFloat
val bits = j.Float.floatToRawIntBits(n)

val sign = (bits >> 31) & 0x1
val exponent = (bits >> 23) & 0xFF
val mantissa = (bits & 0x7FFFFF) | 0x800000

val digits = "%s %s %s".format(
  j.Integer.toBinaryString(sign),
  j.Integer.toBinaryString(exponent | 0x100).drop(1),
  j.Integer.toBinaryString(mantissa).drop(1),
)

val exponentS = exponent - 127
val mantissaS = j.Integer.parseUnsignedInt(mantissa.toBinaryString.reverse, 2)

println(s"IEEE-754 representation for single precision number: ${n}f")
println(s"")
println(s"    $digits")
println(s"   └┬┴───┬────┴───────────┬───────────┘")
println(s"    │    │                │")
println(s"    └────│────────────────│─────────── sign: ${ if (sign == 0) "+" else "-" }")
println(s"         └────────────────│─────────── exponent: $exponentS")
println(s"                          └─────────── mantissa: $mantissaS")
println(s"")