Better way of declaring char?

[coast]

Hi. I came across this piece of code below and was thinking, isn't there a better way of declaring a char for a single character? I also saw the same thing done here

  char letter = ' ';
  printf("enter letter\n");
  scanf("%c",&letter);
  printf("print letter %c\n",letter);

I tried, char letter[0], but it didn't work. I thought it would declare an array of char with 1 element.

If I entered, char letter; would that be a char of 1 ?

Thanks