By Page C
This advisor presents a finished description of the positive factors and implementation of Fortran seventy seven. excellent as a textual content from which to benefit a moment language, or as a reference consultant to a primary or major language.
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Extra info for Professional programmer's guide to Fortran 77
TRUE. FALSE. The dots at each end are needed to distinguish these special forms from the words TRUE and FALSE, which could be used as symbolic names. Character Constants A character constant consists of a string of characters enclosed in a pair of apostrophes which act as quotation marks. Within the quoted string any characters available in the character set of the machine are permitted; the blank (or space) character is significant within character constants and counts as a single character just like any other.
Most systems will issue a warning message for overflow or underflow, and may abort the program, but some processors cannot detect errors of this sort involving integer arithmetic. Every operand (variable, array element, or function reference) used in an expression must have a defined value at the time the expression is evaluated. Note that variables and arrays are initially undefined unless a suitable DATA statement is used. 3 for more details. Arithmetic Constant Expressions Arithmetic constant expressions can be used in PARAMETER statements and to specify implied-DO parameters in DATA statements.
These specific names can be ignored in almost all circumstances, and are listed only in the appendix. In most cases the data type of the function is the same as that of its argument but there are a few obvious exceptions such as the type conversion functions. In the descriptions below, the number and data type of the arguments of each intrinsic function are indicated by a letter: I = integer, R = real, D = double precision, X = complex. An asterisk on the left indicates that the result has the same data type as the arguments.