GMP (GNU Multiple Precision) : "mpz_mod" function error

Question

Can anyone help me with this? The function "mpz_mod" is wrong but i don't know how to fix it.

#include <iostream>
#include <gmp.h>
#include <gmpxx.h>
using namespace std;
int main ()
{
   mpz_class p;
   mpz_class y;
   mpz_class m;
   for ( p=100 ; p<=500 ; p=p++)
      {
         for ( y=50 ; y<=60 ; y=y++)
            {
               mpz_mod (m,p,y);
            }
          if (m==0)
          cout << p << "," << y << "  ok  " <<endl;
      }
}

score 1 · Answer 1 · answered Jul 27 '15 at 23:30

1

mpz_mod is for C code, and takes mpz_t * as arguments. Since you're using C++ and mpz_class, you want m = p % y;

answered Jul 27 '15 at 23:30

Chris Dodd

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I want to use a function for mod (%) but from the gmp library.What can i do? – dimig Jul 27 '15 at 23:34
1

`%` is overloaded by the gmp library to work on `mpz_class` objects, so by using `%` you are getting the mod function from the library. – Chris Dodd Jul 27 '15 at 23:57
Is there any faster function for mod? – dimig Jul 28 '15 at 00:01
In your case, since your numbers are all small, you could use `int` instead of `mpz_class` and not use the GMP lib at all. – Chris Dodd Jul 28 '15 at 00:03

GMP (GNU Multiple Precision) : "mpz_mod" function error

1 Answers1