FORTRAN Reference Manual

Introduction to Statements
FORTRAN Reference Manual—528615-001
6-3
Statement Types
Statement Types
Each FORTRAN statement is classified into one of the following groups:
•
Program unit statements
•
Specification statements
•
Assignment statements Control statements
•
I/O statements
Figure 6-1 shows the type of each FORTRAN statement. Vertical items in the table
designate varieties of statements that can be interspersed. Horizontal items designate
varieties of statements that cannot be interspersed.
STOP Executable Control STOP
SUBROUTINE Nonexecutable Program Unit SUBROUTINE
THEN Executable Control IF (Block)
WRITE Executable I/O WRITE
Figure 6-1. Order of FORTRAN Statements
Table 6-1. FORTRAN Statements (page 3 of 3)
Statement
Executable or
Nonexecutable Type Described Under
END Statement
PARAMETER
Statements
Comment
Lines
FORMAT and
ENTRY
Statements
DATA
Statements
IMPLICIT
Statements
Other
Specification
Statements
Statement
Function
Statements
Executable
Statements
VST0601.vsd
PROGRAM, FUNCTION, SUBROUTINE, or
BLOCK DATA Statement