The new programming language PASCAL XSC is presented with an emphasis on the new concepts for scienti c computation and numerical data processing of the PASCAL XSC compiler. PASCAL XSC is a universal PASCAL extension with extensive standard modules for scienti c computation. It is available for personal computers, workstations, mainframes and supercomputers by means of an implementation in C. By using the mathematical modules of PASCAL XSC, numerical algorithms which deliver highly accurate and automatically veri ed results can be programmed easily. PASCAL XSC simpli es the design of programs in engineering scienti c computation by modular program structure, user-de ned operators, overloading of functions, procedures, and operators, functions and operators with arbitrary result type, dynamic arrays, arithmetic standard modules for additional numerical data types with operators of highest accuracy, standard functions of high accuracy and exact evaluation of expressions. The most important advantage of the new language is that programs written in PASCAL XSC are easily readable. This is due to the fact that all operations, even those in the higher mathematical spaces, have been realized as operators and can be used in conventional mathematical notation. In addition to PASCAL XSC a large number of numerical problem-solving routines with automatic result veri cation are available. The language supports the development of such routines.
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