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One might respond to the statement, C is a programmer s language, with the question, Aren t all programming languages for programmers The answer is an unqualified No! Consider the classic examples of nonprogrammers languages, COBOL and BASIC COBOL was designed to enable nonprogrammers to read and, presumably, understand a program BASIC was created essentially to allow nonprogrammers to program a computer to solve relatively simple problems In contrast, C was created, influenced, and field-tested by real working programmers The end result is that C gives the programmer what the programmer wants: few restrictions, few complaints, block structures, stand-alone functions, and a compact set
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of keywords It is truly amazing that by using C, a programmer can achieve nearly the efficiency of assembly code, combined with the structure of ALGOL or Modula-2 It is no wonder that C became one of the most popular programming languages The fact that C can often be used in place of assembly language contributed greatly to its success Assembly language uses a symbolic representation of the actual binary code that the computer executes Each assembly language operation maps into a single task for the computer to perform Although assembly language gives programmers the potential for accomplishing tasks with maximum flexibility and efficiency, it is notoriously difficult to use when developing and debugging a program Furthermore, since assembly language is unstructured, the final program tends to be spaghetti code a tangled mess of jumps, calls, and indexes This lack of structure makes assembly language programs difficult to read, enhance, and maintain Perhaps more important, assembly language routines are not portable between machines with different CPUs Initially, C was used for systems programming A systems program is part of a large class of programs that forms a portion of the operating system of the computer or its support utilities For example, the following are usually called systems programs: Operating systems Interpreters Editors Compilers File utilities Performance enhancers Real-time executives As C grew in popularity, many programmers began to use it to program all tasks because of its portability and efficiency and because they liked it! At the time of its creation, C was a much longed-for, dramatic improvement in programming languages Of course, C++ has carried on this tradition With the advent of C++, some thought that C as a distinct language would die out Such has not been the case First, not all programs require the application of the object-oriented programming features provided by C++ For example, applications such as embedded systems are still typically programmed in C Second, a substantial amount of C code is still in use, and those programs will continue to be enhanced and maintained While C s greatest legacy is as the foundation for C++, it will continue to be a vibrant, widely used language for many years to come
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It is important to understand that a computer language defines the nature of a program and not the way that the program will be executed There are two general methods by which a program can be executed: it can be compiled or it can be interpreted While programs written in any computer language can be compiled or interpreted, some languages are designed more for one form of execution than the other For example, Java was designed to be interpreted and C was designed to be compiled However, in the case of C, it is important to understand that it was specifically optimized as a compiled language Although C interpreters have been written and are available in some environments (especially as debugging aids or experimental platforms), C was developed with compilation in mind Since C++ Builder is a compiler, you will be compiling and not interpreting programs Since the difference between a compiler and an interpreter may not be clear to all readers, the following brief description will clarify matters In its simplest form, an interpreter reads the source code of your program one line at a time, performing the specific instructions contained in that line This is the way that earlier versions of BASIC worked In languages such as Java, a program s source code is first converted into an intermediary form that is then interpreted In either case, a run-time interpreter is still required to be present to execute the program A compiler reads the entire program and converts it into object code, which is a translation of the program s source code into a form that the computer can execute directly Object code is also referred to as binary code or machine code Once the program is compiled, a line of source code is no longer meaningful in the execution of your program In general, an interpreted program runs slower than a compiled program Remember, a compiler converts a program s source code into object code that a computer can execute directly Therefore, compilation is a one-time cost, while interpretation incurs an overhead each time a program is run
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