Fortran Constructs Supported

When writing code fragments in Fortran, keep these guidelines in mind:

• Only enter one statement on a line. You cannot continue a statement onto more than one line.
   
• You can use GOTO, GO TO, ENDIF, and END IF statements; while ELSEIF is not allowed, you can use ELSE IF.
   
• Syntax is free-form. No column rules apply.
   
• You can enter comments in several formats. For example, you can use the following format:

      C I=I+1
    /*
    I=I+1
    J=J+1
    ARRAY1(I,J)= I * J
    */

• The space character is significant and is sometimes required. (Some Fortran 77 compilers ignore all space characters.) For example:

  Valid	Invalid
  DO 100 I=1,10	DO100I=1,10
  CALL RINGBELL	CALL RING BELL
  X .EQ. 1	X.EQ.1