Fortran 77 4.0 Reference Manual

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F77 allows the BYTE type as an array index, just as it allows the REAL type, but it does not allow BYTE as a DO loop index (where it allows only INTEGER, REAL, and DOUBLE PRECISION). Wherever FORTRAN 77 makes an explicit check for INTEGER, it does not allow BYTE. FALSE. / A BYTE item occupies 1 byte of storage, and is aligned on 1-byte boundaries. CHARACTER The character data type, CHARACTER, which has the synonym, CHARACTER*1, holds one character. The character is enclosed in apostrophes (') or quotes (").

Ordinary integers follow the FORTRAN 77 rules about occupying the same space as a REAL variable. They are assumed to be equivalent to the C type long int, and 1-byte integers are of C type short int. These short integer and logical quantities do not obey the standard rules for storage association. Data Types and Data Items 19 2 An INTEGER*2 occupies 2 bytes. INTEGER*2 is aligned on 2-byte boundaries. INTEGER*4 ♦ The integer data type, INTEGER*4, holds a signed integer. An INTEGER*4 occupies 4 bytes.

If the precision of an integer-valued intrinsic function is not determined by the generic function rules, one is chosen that returns the prevailing length (INTEGER*2) when the –i2 command flag is in effect. When the –i2 option is in effect, the default length of LOGICAL quantities is 2 bytes. Ordinary integers follow the FORTRAN 77 rules about occupying the same space as a REAL variable. They are assumed to be equivalent to the C type long int, and 1-byte integers are of C type short int. These short integer and logical quantities do not obey the standard rules for storage association.

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