each WRITE statement starts a new record or line.

In general, however, the following rules apply: When no specific formatting is specified by the programmer, the computer uses a system-dependent system called list-directed formatting.For output, the formatting depends on the data type of the item and varies from system to system. The READ statement is reading in three values from a file associated with the unit number 7 into array elements COUNT(I), A(I) and NAME(I) where I is the loop-control-variable of the enclosing DO loop.If an error occurs during the READ statement, control will be transferred to the statement labelled 900 (which is a STOP statement in this case.) If the end of the file is reached before 300 valuesare read in, then control will be transferred to the statement labelled 20 which writes a message to the standard output device and the program continues from there. The name of an integer variable or array element with the same program unit.ДЄ record number identifier must be used only with direct-access files. Otherwise, it will be a non-zero value whose meaning is dependent on the operating system.

This will be zero if the record was input or output successfully. If an error occurs during input or output, the program will jump to the statement with the specified label.ДЄfter the READ or WRITE statement has been executed, the specified variable will contain a status value. The label of a statement within the same program unit.

If a READ statement attempts to input a record beyond the end of the file, an end-of-file condition will be triggered and the program will jump to the statement with the specified label. The label of a statement within the same program unit, a character expression or array containing the complete format specification, or an asterisk * for list-directed formatting. If the unit number is listed first and UNIT= is omitted, then the FMT= part of the keyword value pair may also be omitted provided it is listed second. The format value is traditionally listed second after the unit number. The format specifies how the data in the data-transfer-list is to be arranged. The unit number is traditionally listed first and if it is, the UNIT= part of the keyword/value pair may be omitted.ДЄny small positive integer expression when referring to an external file or an asterisk * when referring to the standard pre-connected I/O device.

The unit number associates the READ or WRITE statement with the input or output device. The following table lists the standard specifiers in FORTRAN 77. The control-list is a set of keyword/value pairs which define the characteristics of the I/O. Its general form isД¬orrespondingly, the WRITE statement prints information to one or more records in a file or standard pre-connected output device (like the terminal) from a data-transfer-list of variables, array elements, expressions, etc.

The READ statement reads information from one or more records in a file or standard pre-connected input device (like the terminal) into a data-transfer-list of variables, array elements, etc. However, when using the standard pre-connected I/O devices, the unit number may be replaced by an asterisk *. Unit numbers must be used when reading from or writing to external files. This example reads a single integer value from standard input and writes it to standard output: Two of these numbers are always pre-defined at the start of every FORTRAN 77 program: unit 5 corresponds to standard input, which is often the user's terminal, and unit 6 corresponds to standard output, which is also often the terminal but may be another device, such as a printer. These unit numbers are used in READ and WRITE statements to indicates the source or destination for the operation. Unit NumbersД®very input or output device is identified by a small, positive integer known as the unit number. FORTRAN 77 provides a powerful and flexible set of features for reading and writing data which are independent of the underlying operating system. Almost all FORTRAN 77 programs read data from external sources such as files or the user's terminal, perform calculations on that data, and then write the results to other files or the terminal.

Fortran read last line from file