On Wednesday, May 1, 2013 9:08:12 PM UTC+1, Vaibhav Tulsyan wrote:
> 1. Are you using 'mpz_class' as a generalisation of all classes of the gmp
> library? I'm asking because in the tutorial they've used mpz_t. Will that
> factorial code work if I use mpz_t as the return type instead of mpz_class?
>
There is a C API discussed in the tutorial
There is also a C++ environment defines three classes:
mpz_class for integers
mpq_class for rationals
mpf_class for big precision real numbers
in which most code written in the natural way will work.
> 2. Is usage of set() compulsory? Or can we use the normal way to initialize
> the variable with a value? For e.g., mpz_class x = 0;
Not compulsory. I was only trying to illustrate that you can replace ints with
mpz_classes, and almost everything just compiles and works as you might expect.
Here is some more ordinary code:
mpz_class x = 1000 * 1000; // one million
x *= x*x; // 10 **18
x *= x*x; // 10 **54
cout << x << endl;
mpq_class half(1,2); // define a rational half
cout << half << endl;
cout << half*x << endl; // multiply 10^54 by a half
mpf_class f = half*x; // express as a floating point
cout << f << endl;
gives this output:
1000000000000000000000000000000000000000000000000000000
1/2
500000000000000000000000000000000000000000000000000000
5e+53
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