COMP1927 - Null Terminator Appendation

Character Arrays

If size is specified and there is at least one empty location for it

• YES
  • A[7] = {‘a’, ‘a’, ‘a’, ‘a’, ‘a’, ‘a’} = one spare space
  • B[100] = {‘a’, ‘a’, ‘a’, ‘a’} = lots of spare space
• NO
  • C[3] = {‘c’, ‘c’, ‘c’} = no spare space
  • D[] = {‘d’, ‘d’, ‘d’, ‘d’, ‘d’} = no size specification

Strings

If there is a size & space or no size, or it’s a string pointer

• YES
  • E[7] = “eeeeee” = size and space
  • F[] = “ffff” = no size
  • Char *g = “ggggg” = string pointer
• NO
  • Char i[5] = “iiiii’ = size and no space

Null terminator is critical for string prints, comparisons, copy, generic manipulation.