Significance of Blanks

In free form source code blanks must not appear:

• within keywords

      INTEGER :: wizzy       ! is a valid keyword
      INT EGER :: wizzy      ! is not

• within names

      REAL :: running_total  ! is a valid name
      REAL :: running total  ! is not

Blanks must appear:

• between two separate keywords
• between keywords and names not otherwise separated by punctuation or other special characters.

      INTEGER FUNCTION fit(i) ! is valid
      INTEGERFUNCTION fit(i)  ! is not
      INTEGER FUNCTIONfit(i)  ! is not

Blanks are optional between some keywords mainly `END < construct >' and a few others; if in doubt add a blank (it looks better too).

For more information, click here