#include <stdio.h>

int main()
{ const int maxlen = 16;

  char a[maxlen+1];
  char b[maxlen+1];
  int i;

  for (i = 0; i < maxlen; i += 1)
  { a[i] = 'A' + i;
    b[i] = 'a' + i; }
  a[maxlen] = '\0';
  b[maxlen] = '\0';

  printf("a = '%s'\n", a);
  printf("b = '%s'\n", b);
}