#include <stdio.h>
#include <gmp.h>
#include <time.h>
#define TARGET_NUM 100000
void fibo(int tn);
mpz_t result,next,prev,cur;
int main() {
struct timespec ts;
mpz_init(result);
mpz_init_set_ui (cur,1);
mpz_init(next);
mpz_init(prev);
long start,stop,start_sec,stop_sec;
double whole_time;
timespec_get(&ts, TIME_UTC);
start = ts.tv_nsec;
start_sec = ts.tv_sec;
fibo(TARGET_NUM);
timespec_get(&ts, TIME_UTC);
stop = ts.tv_nsec;
stop_sec = ts.tv_sec;
gmp_printf("Fibo #%d = %Zd\n",TARGET_NUM,result);
whole_time = stop_sec-start_sec;
whole_time += (stop-start)/1000000000.0;
printf("Whole time = %.2fs\n",whole_time);
return(0);
}
void fibo(int tn) {
if (tn==0) {
mpz_set_ui(result,0);
return;
}
if (tn<=2) {
mpz_set_ui(result,1);
return;
}
while(tn-->1) {
mpz_add(next,cur,prev);
mpz_set(prev,cur);
mpz_set(cur,next);
}
mpz_set(result,cur);
}
