Fortran 90/95 Programming Manual

Fortran 90/95 Programming Manual fifth revision (2005) Tanja van Mourik Chemistry Department University College London Copyright: Tanja van Mourik Fortran 90/95 Programming Manual Fortran 90/95 Programming Manual Brief History of Fortran The first Fortran (which stands for Formula Translation) compiler was developed in 1957 at IBM. In 1966 the American Standards Association (later the America National Standards Institute, ANSI) released the first standard version of Fortran , which later became known as Fortran 66. The standard aimed at providing a standardised, portable language, which could easily be transferred from one computer system to the other. In 1977, a revised version of Fortran , Fortran 77, was completed (the standard was published in 1978). The next version is Fortran 90, which is a major advance over Fortran 77. It contains many new features; however, it also contains all of Fortran 77. Thus, a standard-conforming Fortran 77 program is also a standard-conforming Fortran 90 program.

a program starts with program program_name it ends with end program program_name print* displays data (in this case, the character string “Hello, world!”) on the screen. all characters after the exclamation mark (!) (except in a character string) are ignored by the compiler. It is good programming practice to include comments.

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