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Another way to structure and compartmentalize code in C is through the use of blocks of code A code block is a logically connected group of program statements that is treated as a unit In C, you create a code block by placing a sequence of statements between opening and closing curly braces In this example,
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if (x < 10) { printf(''Too low, try again\n"); scanf("%d", &x); }
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the two statements after the if and between the curly braces are both executed if x is less than 10 These two statements together with the braces represent a code block They are a logical unit: One of the statements cannot execute without the other executing also Code blocks allow many algorithms to be implemented with clarity, elegance, and efficiency Moreover, they help the programmer better conceptualize the true nature of the algorithm being implemented C Is a Programmer's Language Surprisingly, not all computer programming languages are for programmers Consider the classic examples of nonprogrammer languages, COBOL and BASIC COBOL was designed not to better the programmer's lot, not to improve the reliability of the code produced, and not even to improve the speed with which code can be written Rather, COBOL was designed, in part, to enable nonprogrammers to read and presumably (however unlikely) to understand the 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 working programmers The end result is that C gives the programmer what the programmer wants: few restrictions, few complaints, block structure, stand-alone functions, and a compact set of keywords By using C, you can nearly achieve the efficiency of assembly code combined with the structure of Pascal or Modula-2 It is no wonder that C has become the universal language of programmers around the world The fact that C can often be used in place of assembly language was a major factor in its initial success Assembly language uses a symbolic representation of the actual binary code that the computer executes directly Each assembly-language operation maps into a single task for the computer to perform Although assembly language gives programmers the potential to accomplish tasks with maximum flexibility and efficiency, it is notoriously difficult to work with 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
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Initially, C was used for systems programming A systems program forms a portion of the operating system of the computer or its support utilities, such as editors, compilers, linkers, and the like 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 In the years that have since elapsed, C has proven that it is up to any task With the advent of C++, some programmers thought that C as a distinct language would cease to exist Such is not 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, much of the world still runs on C code, and those programs will continue to be enhanced and maintained Third, as the new C99 standard shows, C is still a venue in which leading-edge innovation is taking place While it is undeniably true that C will always be remembered as forming the foundation for C++, it will also be known as one of the world's great programming languages on its own Compilers vs Interpreters 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 Although 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 like the interpreter developed in Part Six of this book), C was developed with compilation in mind Therefore, you will almost certainly be using a C compiler and not a C interpreter when developing your C programs Since the difference between a compiler and 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 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
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