C Is a Middle-Level Language in .NET framework

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C is often called a middle-level computer language This does not mean that C is less powerful, harder to use, or less developed than a high-level language such as BASIC or Pascal; nor does it imply that C has the cumbersome nature of assembly language (and its associated troubles) Rather, C is thought of as a middle-level language because it combines the best elements of high-level languages with the control and flexibility of assembly language Table 1-1 shows how C fits into the spectrum of computer languages As a middle-level language, C allows the manipulation of bits, bytes, and addresses the basic elements with which the computer functions Despite this fact, C code is also
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Table 1-1
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C s Place in the World of Languages
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portable Portability means that it is easy to adapt software written for one type of computer or operating system to another For example, if you can easily convert a program written for UNIX so that it runs under Windows, that program is portable All high-level programming languages support the concept of data types A data type defines a set of values that a variable can store along with a set of operations that can be performed on that variable Common data types are integer, character, and real Although C has five basic built-in data types, it is not a strongly typed language, as are Pascal and Ada C permits almost all type conversions For example, you may freely intermix character and integer types in an expression Unlike a high-level language, C performs almost no run-time error checking For example, no check is performed to ensure that array boundaries are not overrun These types of checks are the responsibility of the programmer In the same vein, C does not demand strict type compatibility between a parameter and an argument As you may know from your other programming experience, a highlevel computer language will typically require that the type of an argument be (more or less) exactly the same type as the parameter that will receive the argument However, such is not the case for C Instead, C allows an argument to be of any type so long as it can be reasonably converted into the type of the parameter Further, C provides all of the automatic conversions to accomplish this C is special in that it allows the direct manipulation of bits, bytes, words, and pointers This makes it well suited for system-level programming, where these operations are common Another important aspect of C is that it has only a few keywords, which are the commands that make up the C language For example, C89 defines only 32 keywords, with C99 adding just another 5 Some computer languages have several times more For comparison, most versions of BASIC have well over 100 keywords!
C Is a Structured Language
In your previous programming experience, you may have heard the term block-structured applied to a computer language Although the term block-structured language does not strictly apply to C, C is commonly referred to simply as a structured language It has many similarities to other structured languages, such as ALGOL, Pascal, and Modula-2 The reason that C (and C++) is not, technically, a block-structured language is that block-structured languages permit procedures or functions to be declared inside other procedures or functions However, since C does not allow the creation of functions within functions, it cannot formally be called block-structured The distinguishing feature of a structured language is compartmentalization of code and data This is the ability of a language to section off and hide from the rest of the program all information and instructions necessary to perform a specific task One way that you achieve compartmentalization is by using subroutines that employ local (temporary) variables By using local variables, you can write subroutines so that the events that occur within them cause no side effects in other parts of the program
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