Seach for data on an array region with decreasing step sizes

scan.cpp

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

void scan(uint64_t min, uint64_t max, uint64_t min_step = 1) {
    uint64_t step = 1L<<63;

    printf("%02" PRIu64 "\n", min);
    while (step > min_step) {
        for (uint64_t i = min + step / 2; i<max; i+=step) {
            printf("%03" PRIu64 "\n", i);
        }
        printf("\n");
        step /= 2;
    }
}

int main(int argc, char** argv) {
    if (argc != 3 && argc != 4) {
        printf("Usage: %s MIN MAX [MIN_STEP]\n", argv[0]);
        return 1;
    }
    scan(atoi(argv[1]), atoi(argv[2]), argc == 3 ? 1 : atoi(argv[3]));
}