PGI Fortran Reference manual - The Portland Group

Input and OutputFurther suppose that you use the following statement to read in the list from the input file:READ * I, J, X, Y, Z, A, C, KThe variables are assigned the following values by the list-directed input/output mechanism:I=10 J=-14 X=25.2 Y=-76.0Z=313.0 A=-1.5 C=29 K=125In the example the value for A does not change because the input record is null.Input isterminated with the / so no input is read for K, so the program assumes null and K retains itsprevious value.5.7.2. List-directed outputList directed input/output is an abbreviated form of formatted input/output that does not requirethe use of a format specification. Depending on the type of the data item or data items in theiolist, data is transferred to or from the file, using a default, and not necessarily accurate formatspecification. The data type of each item appearing in the iolist is formatted according to the rulesin the following table:Table 20 Default List Directed Output FormattingData TypeBYTEINTEGER*2INTEGER*4INTEGER*8LOGICAL*1LOGICAL*2LOGICAL*4LOGICAL*8REAL*4REAL*8COMPLEX*8COMPLEX*16CHAR *nDefault FormattingI5I7I12I24I5 (L2)Note that this format is applied when the option –Munixlogical is selected whencompiling.L2L2L2G15.7e2G25.16e3(G15.7e2, G15.7e2)(G25.16e3, G25.16e3)AnThe length of a record is less than 80 characters; if the output of an item would cause the length toexceed 80 characters, a new record is created.The following rules and guidelines apply when using list-directed output:‣ New records may begin as necessary.‣ Logical output constants are T for true and F for false.PGI Fortran Reference Guide 85