clojure.core/bigint

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Type: function Added: Clojure 1.3 Examples: 6 Runnable: 1

([x])

Coerce to BigInt

Examples

by Miles on 2010-09-06 . May have evaluation errors. ▶

(bigint 30) 30 ;; Actually do something BigInteger-ish... (http://download.oracle.com/javase/6/docs/api/) (def x (bigint 97)) #'user/x (.isProbablePrime (.toBigInteger x) 100) true

by rebcabin on 2013-08-03 . May have evaluation errors. ▶

(= (bigint 42) (clojure.lang.BigInt/fromBigInteger (BigInteger. "42"))) true (= 42N (bigint 42)) true (= 42 (bigint 42)) true (= 42 (clojure.lang.BigInt/fromBigInteger (BigInteger. "42"))) true

by rebcabin on 2013-08-03 . May have evaluation errors. ▶

(reduce * (repeat 20 1000)) ArithmeticException integer overflow clojure.lang.Numbers.throwIntOverflow (Numbers.java:1388) (reduce * (repeat 20 (bigint 1000))) 1000000000000000000000000000000000000000000000000000000000000N

by chrm on 2017-11-01 . May have evaluation errors. ▶

;; There is a difference between `BigInt` and `BigInteger`. The first is from ;; Clojure and should be better for performace, because less unboxing is ;; necessary. The second is from Java and has more functionality. ;; https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html (type 123N) ;; => clojure.lang.BigInt (type (bigint 123)) ;; => clojure.lang.BigInt (type (biginteger 123)) ;; => java.math.BigInteger (.modInverse (bigint 123) (bigint 4)) ;; IllegalArgumentException No matching method found: modInverse for class ;; clojure.lang.BigInt (.modInverse (biginteger 123) (biginteger 4)) ;; => 3

by cloojure on 2018-09-02 . May have evaluation errors. ▶

; It also works for strings (bigint "12345") => 12345N

by berczeck on 2020-08-23 ▶

;; Take care with ratios the decimal part is removed not rounded (bigint 5/4) ; 1.25 ;; 1N (bigint 5/2) ; 2.5 ;; 2N

Note by rebcabin

The last example does not seem to work; there seems to be a missing coercion from Clojure BigInt to Java BigInteger. I get

IllegalArgumentException No matching method found: isProbablePrime for class clojure.lang.BigInt  clojure.lang.Reflector.invokeMatchingMethod (Reflector.java:53)

See also

• clojure.core/biginteger (1)
• clojure.core/bigdec (2)

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