LYCOS RETRIEVER 
Pascal (Language): Pascal Programming
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The original Pascal compiler became operational in 1970. It was created for the CDC 600 series mainframe computer and was written in the Fortran programming language. Pascal compilers created after 1975 have typically been written in Pascal. Usually, these compilers can recompile themselves to include new language features. A Pascal compiler can ... recompile itself when ported to a different environment.
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Pascal Van Hentenryck’s primary research area is the design and implementation of languages and tools to solve difficult combinatorial optimization problems. Optimization applications, which include scheduling, resource allocation, planning, and configuration problems, are becoming increasingly important. However, the computational and software complexity inherent in these applications make their development a challenging task. The purpose of Prof. Van Hentenryck’s research is to provide tools and algorithms that significantly reduce the development time and ease the maintenance of these applications.
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This Pascal compiler is a 32 bit compiler that generates code for DOS. It has a number of extensions to the Pascal language, including function, operator and procedure overloading. It comes with source code, and generates assembly code that requires TASM or MASM to assemble. You will ... need to download the (free) WDOSX dos extender (see the Free DOS Extenders page for more information about WDOSX).
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As shown in the example above, Pascal files are sequences of components. Every file has a buffer variable which is denoted by f^. The procedures get (for reading) and put (for writing) move the buffer variable to the next element. Read is introduced such that read(f, x) is the same as x:=f^; get(f);. Write is introduced such that write(f, x) is the same as f^ := x; put(f); The type text is predefined as file of char. While the buffer variable could be used to inspect the next character that would be used (check for a digit before reading an integer), this concept lead to serious problems with interactive programs with early implementations, but was solved later with the "lazy I/O" concept.
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All Pascal programs start with the "Program" keyword, an optional list of internal file descriptors and then a block of code is indicated with the "Begin" and "End" keywords. Letter case is ignored in the Pascal language. Semicolons separate statements, and the full stop ends the program (or unit).
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Pascal proved to be a very influential language. First described in a published report in 1971, it affected almost every block-structured language designed since (e.g. Ada). Niklaus Wirth continued to design programming languages, including the Modula family.
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Pascal Programming