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Spatial Isomer. Canada Tax Map. Disable Avg Antivirus. Alternate Characters. Saturn Galaxy. In the above syntax, we are using the NULL value here to assign to a pointer. First, we have to define the pointer, and then we can initialize it with NULL.
Sample practice syntax for more understanding see below;. As of now, we know that we use Null functions to assign some special value to the pointer variable. By the use of this, we can give them a logical value when they are not pointing to any address in the memory. Also, we know that pointer holds the memory address, so if we want them to point to some other value, in that case, we can use NULL here.
But we have to use this while initiation of the pointer. Now we will see one example and understand its working how it actually works; for more detail, see below;. In this example, we create three different pointers, and all of them point to the NULL here.
So as we can see, we have initialized the value for the variable at the time of declaring the variables. After this, we are making one check here to check and print the value of the pointer. From the above statement, it is clear that the Software part of an Embedded System is equally important as the Hardware part. There is no point in having advanced Hardware Components with poorly written programs Software. In the process of making a better embedded system, the programming of the system plays a vital role and hence, the selection of the Programming Language is very important.
The following are few factors that are to be considered while selecting the Programming Language for the development of Embedded Systems. Earlier Embedded Systems were developed mainly using Assembly Language. Even though Assembly Language is closest to the actual machine code instructions and produces small size hex files, the lack of portability and high amount of resources time and man power spent on developing the code, made the Assembly Language difficult to work with.
There are other high-level programming languages that offered the above mentioned features but none were close to C Programming Language. Some of the benefits of using Embedded C as the main Programming Language:. The C Programming Language provided low level memory access using an uncomplicated compiler a software that converts programs to machine code and achieved efficient mapping to machine instructions.
The C Programming Language became so popular that it is used in a wide range of applications ranging from Embedded Systems to Super Computers. The Embedded C Programming Language uses the same syntax and semantics of the C Programming Language like main function, declaration of datatypes, defining variables, loops, functions, statements, etc. There is actually not much difference between C and Embedded C apart from few extensions and the operating environment. C Programming Language is generally used for developing desktop applications, whereas Embedded C is used in the development of Microcontroller based applications.
Now that we have seen a little bit about Embedded Systems and Programming Languages, we will dive in to the basics of Embedded C Program. A Keyword is a special word with a special meaning to the compiler a C Compiler for example, is a software that is used to convert program written in C to Machine Code.
Data Types in C Programming Language or any programming language for that matter help us declaring variables in the program. There are many data types in C Programming Language like signed int, unsigned int, signed char, unsigned char, float, double, etc. In addition to these there few more data types in Embedded C.
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