OutstandingSmartArtificialintelligence created by VehpuS - https://repl.it/@VehpuS/OutstandingSmartArtificialintelligence

bit_index_string.c

#include <stdio.h>

char txt[] = {
  [(0 << 0) ... ((1 << 0) - 1)] = '0',
  [(1 << 0) ... ((1 << 1) - 1)] = '1',
  [(1 << 1) ... ((1 << 2) - 1)] = '2',
  [(1 << 2) ... ((1 << 3) - 1)] = '3',
  [(1 << 3) ... ((1 << 4) - 1)] = '4',
  [(1 << 4) ... ((1 << 5) - 1)] = '5',
  '\0'
};

int main(void) {
  printf("%s\n", txt);
  return 0;
}