They are: UNIT = 5 for INPUT from the keyboard with the READ statement UNIT = 6 for OUTPUT to the screen with the WRITE statement Most versions of FORTRAN will also let you use the ASTERISK (*) for I/O to the TERMINAL. Standard FORTRAN reserves two UNIT numbers for I/O to user. The UNIT is an INTEGER or INTEGER EXPRESSION, generally between 1-30. The device can be the TERMINAL or a FILE (or something else too). UNIT NUMBER The UNIT is a number which has an association with a particular device. The input and output lists (item1, item2.) are composed of constants, variables or expressions, separated by COMMAS.

Again, SPACES may be used to add clarity to the statement. In this form, PARENTHESES are used to enclose information about the UNIT, the FORMAT (if any) and other options. Typically, you transfer data files to/from tape, diskette, and printer by using UNIX (or DOS on PCs) commands, rather than a Fortran program reading or writing directly from/to the device. NOTE: We will restrict our use to TERMINAL and FILE I/O. READ(unit#, format, options) item1, item2. The general form is: WRITE(unit#, format, options) item1, item 2. GENERAL FORM OF I/O STATEMENTS The general form of the FORTRAN I/O statements allow data transfer to FILES, TAPE, PRINTER and other devices as well as the TERMINAL.

This statement should tell the user WHAT to enter. Insert a WRITE statement to PROMPT yourself for input just before a READ statement. Lana Del Rey Summertime Sadness Mp3 Zippy. Separate values with SPACES when typing data into the program with a READ operation. The program will not continue until all values have been entered. The READ statement causes the program to PAUSE and allow you to enter values. NOTES ON LIST-DIRECTED I/O SPACES may be inserted between components of the statement to add clarity. The second asterisk (*) means the computer decides how the I/O elements should look based on the TYPE of data in the input/output list. Where ITEMx = a variable, a constant or math expression Example: WRITE(*,*) 'ALPHA=', ALPHA The first asterisk (*) means the input comes from the keyboard in a READ statement and goes to the screen in a WRITE statement.

FORTRAN I/O FORTRAN: Input/Output (I/O) SIMPLE I/O: LIST-DIRECTED The simplest form of the I/O statement is the list-directed form which is represented by: READ(*,*) item1, item2, item3.

Fortran read last line from file