Fortran 90 programming by T. M. R. Ellis, Ivor R. Philips, Thomas M. Lahey

By T. M. R. Ellis, Ivor R. Philips, Thomas M. Lahey

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REAL • and INTEGER variables A real number, on the other hand, is stored as a floating-point number, is held as an approximation to a fixed number of significant digits and has a very large range (typically between about _10'38 and +10'38 to seven or eight significant digits on the same 32-bit computer). 2 REAL and INTEGER variables The whole question of storage of different types of information in a computer can become quite complicated, and we shall return to this topic several times as we develop a fuller understanding of the power and flexibility of the Fortran language.

In this book we shall use upper case for all words which have a special meaning in Fortran, known as keywords, and will use lower case for names created by the programmer. The name of the program should be chosen to indicate what the program does and should be different from any other names used for other purposes elsewhere in the program. Note also that the blank (or space) between the word PROGRAM and the name circle is included, as in normal English, to make the program easier to read. There may be any number of blanks between successive words in a Fortran 90 statement, as long as there is at least one, but they will be treated as though there was only one by the compiler when it is analysing the program.

An IMPLICIT statement. ; a trailing comment is a comment whose initial! follows the last statement on a line. Comments are ignored by the compiler .. • Specification statements provide information about th~ program to the compiler. ng the execution of the program. • A list-directed input statement is used to obtain information from the user of a program during execution. • A list-directed output statement is used to give information to the user of a program during execution. • A CALL statement is used to transfer processing to a subroutine, using information passed to the subroutine by means of arguments, enclosed in parentheses.

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