在Java中的biginteger数组中分配值

Question

For some program I need an array which stores a Fibonacci sequence number up to the 100th term. Although I can calculate that using fib function and storing in array, I want to save time by storing it manually. How can i do this?

I was trying to do this like so:

BigInteger[] arr={259695496911122585,420196140727489673,
679891637638612258,1100087778366101931,1779979416004714189};

However, I get the error "Type mismatch; can not convert int to BigInteger".

Answer 1

You have an BigInteger array and try to add primitive int types. You have to create BigInteger instances which can be part of your array:

BigInteger[] arr={BigInteger.valueOf(1),BigInteger.valueOf(259695496911122585L)};

Or if your values are bigger as a long value use the constructor with String argument:

BigInteger[] arr={new BigInteger("259695496911122585"),new BigInteger("420196140727489673")};

Answer 2

int is a primitive type, while BigInteger is a class type.

For your case, you have an Array of BigIntegers. So each element of the array must be of the BigInteger class type. You are giving it int, a primitive type, so it will complain.

To solve this, each indice of the array should contain an object of the BigInteger type.

BigInteger[] bigIntegerArray = {new BigInteger(#),.....}

Where # is a number, and ... is additional indices.