CNL is written in C for C/C++ programmers and based on the world's most widely used IMSL Fortran subroutines, taking full advantage of the language features of C. CNL 5.5 includes a comprehensive collection of the most widely used IMSL numerical algorithms. CNL offers proven and accurate mathematical, statistical, and financial algorithms. The IMSL C Numerical Library (CNL) provides advanced mathematical and statistical functionality for programmers to embed in applications that are written in one of the most important mainstream programming environments in use today, C/C++. This comprehensive set of thread safe functions is based upon the same algorithms contained in the highly regarded IMSL Fortran Library. CNL offers software engineers the opportunity to author "thread safe" implementations. This feature will leverage existing hardware investments and allow developers to produce applications capable of faster throughput. With this capability, CNL can be confidently integrated into Web and database servers in which multiple threads are used to handle multiple, independent, computations. Visual Numerics developed the "thread safe" features of CNL based on the POSIX pthread industry standard (UNIX) and Windows thread API (PC). The system "thread safe" libraries on which CNL is based are present on all major platforms. The IMSL C Numerical Libraries significantly shorten program development time and promote standardization. Variable argument lists have been implemented to simplify calling sequences. You'll find that using the IMSL C Numerical Libraries saves up to 95% of your source code development and thousands of dollars in the design, development, documentation, testing and maintenance of your application.