CODEWITHSUNDEEP
javagroovy
Kalle H. Väravas
Kalle H. Väravas

Reputation: 3615

How to convert big numbers from one base to another

I am trying to convert a SQL function into Groovy for usage in Elasticsearch, but I am stuck at this stage. Considering, I have never touched java or groovy in my life, what am I doing wrong?

CODE

public String convertFromBaseToBase(String str, int fromBase, int toBase) {
    return Integer.toString(Integer.parseInt(str, fromBase), toBase);
}

output = convertFromBaseToBase("8f8f87878f8f8080", 16, 10);

System.out.print(output);

Taken from Convert from one base to another in Java

ERROR

java.lang.NumberFormatException: For input string: "8f8f87878f8f8080"
at java_lang_Integer$parseInt.call(Unknown Source)
at Script1.convertFromBaseToBase(Script1.groovy:2)
at Script1.run(Script1.groovy:5)

Upvotes: 1

Views: 102

Answers (1)

Adil Shaikh
Adil Shaikh

Reputation: 44740

8f8f87878f8f8080 is a very big number (10344635885392199808 in decimal), and will not fit inside an Integer.

You will have to use BigInteger for such big numbers.

public static String convertFromBaseToBase (String str, int fromBase, int toBase){
  return (new BigInteger(str, fromBase)).toString(toBase);
}

Working Code --> https://www.onlinegdb.com/B1mMEcKPX

BigInteger -->https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#toString(int)

Upvotes: 2

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