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

int main( void ) {
  int i = 0;
  char letter[7];
  char *tmp[1];

  FILE *fp = fopen("abc", "r");

  while (fscanf(fp, "%s", letter) == 1) {
    printf("\nBegin print!\n");
    // changing tmp pointer only once!
    if (i == 0) {
      printf("check\n");
      tmp[i] = letter;
    }
    // temp pointer automatically changes each iteration
    printf("tmp = %s\n", tmp[0]);
    i++;
  }
  return 0;
}

 a b c
 defg

Begin print!
check
tmp = a

Begin print!
tmp = b

Begin print!
tmp = c

Begin print!
tmp = defg

   f=:4#.0 2 1 3{~4#.inv]
   f 47525
30298

   f=:4#.0 2 1 3{~4#.inv]
|index error
|   f=:4#.0 2 1 3    {~4#.inv]

def fast_pow(int b, int n):
    if n<0: return 0
    if n==0: return 1
    if n==1: return b
    temp = fast_pow(b,n<<2)
    return temp*temp*[1,n][n%2]