HP 3000 Manuals HP 3000 Manuals
Chapter 2 Formatted Input/Output HP FORTRAN 77 provides you with control over I/O operations through the use of format specifications. Formatted I/O can be used for I/O access to devices (such as terminals), line printers, or disk files. This chapter describes how to use formatted I/O and list-directed (free-format) I/O. Chapter 3 describes how to use unformatted I/O and nonstandard files. An I/O statement is connected to its source or destination through a unit number specified as a parameter in the READ or WRITE statement. All HP FORTRAN 77 programs have at least two "preconnected" unit numbers: 5 and 6. These unit numbers are automatically connected to the standard input and output files, respectively. Typically, your terminal is the default standard input and output file.