Thread: GMP Library: simple question

Hi.

I've written a small program to compute very large numbers using the Collatz Conjecture. I have been told I should use the GMP library, so I downloaded the file, and there's a bunch of .c and .h files. So what I did was paste inside the folder my own .c file and use the headers gmp.h

However I am still unable to make use of large numbers such as 1000000000000000.

How can I fix this?
And if I successfully use the GMP library to work with large numbers, will they be absolutely precise?

Code:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "gmp.h"
int main(void){
	unsigned long i,cont,iter;
	cont=0;
	for(i=1000000000000000;i<=1000000000000010;i++){
		iter=i;
		do{
			if(iter%2==0){
				iter/=2;
				cont++;}
			else{
				iter=iter*3+1;
				cont++;}
		}while(iter!=1);
		printf("Collatz Conjecture - iteration: %d\t\t\tsteps:%d\t\t\t\n",i,cont);
		cont=0;}
	return 0;
}

Originally Posted by tabstop

Have you done something crazy like read the manual? Using GSL doesn't extend long to be magically large.

EDIT: And also, you have to build the library (since you downloaded the source, instead of downloading the library binaries).

Oh there's a Manual alright. Thank you very much. That shall suffice.