odd integer inverse calculator

inverse.c

// Ralph Doncaster 2020 public domain software
// calculate the 64-bit inverse of odd integers
#include <stdio.h>
#include <stdint.h>

#define END_RANGE 9999

int main()
{
    uint64_t neg1 = (uint64_t) -1LL;
    uint64_t n = 3LLU;
    uint64_t inverse = neg1 / n;
    do {
        uint64_t inverse = neg1 / n;
        uint64_t try = 1LLU;
        do {
            if ( ((inverse * try + 1) *n ) == 1 )  printf("1/%llu = %llu\n", n, inverse * try + 1);
        } while ( try++ < n);
        n += 2;
    } while (n <= END_RANGE);
}