Read or write 64-bit unsigned words from or to file

ascending_unsigned.c

#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <inttypes.h>

int main () {
  FILE *file = NULL;
  uint64_t buffer[1];  // array of bytes, not pointers-to-bytes
  size_t bytesRead = 0;

  file = fopen("numbers.bin", "rb");

  if (file != NULL) {
    // for (uint64_t x = 0; x < 1024 * 1024; x++) {
    //   ((uint64_t*)buffer)[0] = x;
    //   fwrite(buffer,1,sizeof(buffer),file);
    // }
    // read up to sizeof(buffer) bytes
    while ((bytesRead = fread(buffer, 1, 8, file)) > 0)
    {
      // process bytesRead worth of data in buffer
      printf("Another chunk %" PRIu64 "\n", buffer[0]);
      usleep(10000);
    }
  } else {
    printf("no file\n");
  }
  return 0;
}