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POGMP Overflow when using large numbers
 

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    <p>I'm working on a program to factor very large numbers (20 digits or more) in C++ and am using GMP to deal with overflow issues. My program is working well for numbers of about 10 digits or less, but when I throw a 15 digit number at it, it blows up. I'm going to boil my program down to simply one line like this:</p> <pre><code>#include &lt;iostream&gt; #include &lt;stdio.h&gt; #include &lt;gmp.h&gt; #include &lt;gmpxx.h&gt; using namespace std; int main() { mpz_class n = 48112959837082048697; //this blows up return 0; } </code></pre> <p>If I replace that line with </p> <pre><code>mpz_class n = 12623773; </code></pre> <p>then everything works just fine.</p> <p>Here is the error:</p> <pre><code>$ g++ -o main main.cpp -lgmpxx -lgmp main.cpp: In function ‘int main()’: main.cpp:21:19: error: conversion from ‘long long int’ to ‘mpz_class’ is ambiguous /usr/include/gmpxx.h:1563:3: note: candidates are: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(double) /usr/include/gmpxx.h:1562:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(float) /usr/include/gmpxx.h:1560:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(long unsigned int) /usr/include/gmpxx.h:1559:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(long int) /usr/include/gmpxx.h:1557:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(short unsigned int) /usr/include/gmpxx.h:1556:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(short int) /usr/include/gmpxx.h:1554:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(unsigned int) /usr/include/gmpxx.h:1553:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(int) /usr/include/gmpxx.h:1551:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(unsigned char) /usr/include/gmpxx.h:1550:3: note: __gmp_expr&lt;__mpz_struct [1], __mpz_struct [1]&gt;::__gmp_expr(signed char) </code></pre> <p>Anybody know how to fix this so that I can use large numbers? I thought that GMP was supposed to allow something like 500 digits, plus or minus.</p> <p>Thanks!</p>
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