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Limit factorial

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Sad Ellie 2023-08-11 11:53:29 +03:00
parent 0c69cb90fa
commit de36613cab
1 changed files with 7 additions and 4 deletions
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11
data/evaluatto/src/main/java/io/github/sadellie/evaluatto/Expression.kt
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@ -23,16 +23,18 @@ import com.sadellie.unitto.core.base.Token
import java.math.BigDecimal import java.math.BigDecimal
import java.math.MathContext import java.math.MathContext
import java.math.RoundingMode import java.math.RoundingMode
import kotlin.math.cos
import kotlin.math.sin
import kotlin.math.tan
import kotlin.math.acos import kotlin.math.acos
import kotlin.math.asin import kotlin.math.asin
import kotlin.math.atan import kotlin.math.atan
import kotlin.math.cos
import kotlin.math.exp
import kotlin.math.ln import kotlin.math.ln
import kotlin.math.log import kotlin.math.log
import kotlin.math.exp
import kotlin.math.pow import kotlin.math.pow
import kotlin.math.sin
import kotlin.math.tan
private val maxFactorial by lazy { BigDecimal("9999") }
sealed class ExpressionException(override val message: String): Exception(message) { sealed class ExpressionException(override val message: String): Exception(message) {
class DivideByZero : ExpressionException("Can't divide by zero") class DivideByZero : ExpressionException("Can't divide by zero")
@ -300,6 +302,7 @@ private fun BigDecimal.pow(n: BigDecimal): BigDecimal {
private fun BigDecimal.factorial(): BigDecimal { private fun BigDecimal.factorial(): BigDecimal {
if (this.remainder(BigDecimal.ONE).compareTo(BigDecimal.ZERO) != 0) throw ExpressionException.FactorialCalculation() if (this.remainder(BigDecimal.ONE).compareTo(BigDecimal.ZERO) != 0) throw ExpressionException.FactorialCalculation()
if (this < BigDecimal.ZERO) throw ExpressionException.FactorialCalculation() if (this < BigDecimal.ZERO) throw ExpressionException.FactorialCalculation()
if (this > maxFactorial) throw ExpressionException.TooBig()
var expr = this var expr = this
for (i in 1 until this.toInt()) { for (i in 1 until this.toInt()) {