Significance of Blanks

In free form source code blanks must not appear:

• within keywords
• within names

      INTEGER       ! is a valid keyword
      INT EGER      ! is not
      running_total ! is a valid name
      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 :: hours, mins  ! is valid
      INTEGERhours, mins      ! not valid

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