Specify an asterisk only if d2 is part of the last dimension declarator (see below). Is an upper-dimension bound that must be a numeric expression or an asterisk (*). Is a lower-dimension bound that must be a numeric expression. (Refer to the Fortran 77 Programmer's Guide for the sizes of arithmetic and logical data types.) If n < g, the Hollerith constant is stored and extended on the right with ( g – n ) blank characters. The number of characters ( n) in the Hollerith constant must be less than or equal to g, the maximum number of characters that can be stored in a variable of the given type, where g is the size of the variable expressed in bytes. When a Hollerith constant is used in an actual parameter list of a subprogram reference, the formal parameter declaration within that subprogram must specify a numeric type, not a character type.Ī variable can be defined with a Hollerith value through a DATA statement, an assignment statement, or a READ statement.

In other cases, the constant is assumed to be of type INTEGER*4. In other cases, when used in statements that require a specific data type, the constant is assumed to be the required type and length.Ī length of four bytes is assumed for hexadecimal and octal constants used as arguments no data type is assumed. The constant is assumed to be of type INTEGER*2 and two bytes long. When used with a a binary operator, octal and hexadecimal constants assume the data type of the other operand. Hollerith constants have no type they assume a numeric data type and size depending on the context in which they are used. Hollerith constants are stored as byte strings each byte is the ASCII representation of one character. Table 2-1 illustrates real constants written in common and scientific notation with their corresponding E format. See the Fortran 77 Programmer's Guide for information on the magnitude and precision of a real number. The value of a real constant is either the basic real constant or, for the forms sww.ff E see and sww E see, the product of the basic real constant or integer constant and the power of ten indicated by the exponent following theĪll three forms can contain more digits than the precision used by the processor to approximate the value of the real constant. Is a string of digits denoting the fractional part, if any.ĭenotes a real exponent, where see is an optionally signed integer.Ī basic real constant is written as an optional sign followed by a string of decimal digits containing an optional decimal point. Is a string of digits denoting the whole number part, if any. Is the sign of the number: – for negative, + (optional) for positive.

Fortran double precision