What programming language will enable me to enter a very long number without converting it to floating point?

Question

What would be the best way to do the following.

Enter a very long number, lets say 500,000 digits long without it going into scientific notation; and then am able to

Answer 1

In C or C++, you can use GMP (Gnu Multi-Precision library).

In Perl, you can use the bignum module.