Fibonacci sequence from F(0) to F(100)

f100.c

#include <stdio.h>

static void print128(unsigned __int128 a)
{
    const unsigned long long base = 10000000000000000000;
    
    if (a >> 64)
        printf("%llu%0.19llu\n", (unsigned long long)(a / base), (unsigned long long)(a % base));
    else
        printf("%llu\n", (unsigned long long)a);
}

int main()
{
    __int128 curr = 0;
    __int128 next = 1;
    
    for (int i = 0; i <= 100; ++i) {
        printf("Fibonacci #%d: ", i);
        print128(curr);
        __int128 last = next;
        next += curr;
        curr = last;
    }
}