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C is a procedural programming language to develop scientific, Engineering applications, and device drivers.C language is also used to implement different operating system operations. For ex: UNIX kernel is completely developed in a C language. Latter LINUX and GNU written in C.The latest version of C is C11.
Characteristics of C Language:
a) C is a more user friendly and powerful language.
b) C is most commonly used programming language for writing operating system.
c) C is a Structural language
d) Its produce efficient programs.
Basic Structure of C program:
Documentation Section
File Inclusion
Global Declaration Section
main( ) ------- Main function
{
Declaration section
Executable section
}
Subprogram section
Function -1
{ }
Function 2
Documentation Section : In this section includes name of the program, the author and others details. All document must be include / * -------------*/ or sentence should start with two hypon
ex : -- this is addition program
File Inclusion : In this section include file which is used in program by using # symbol.all lines that start with # are processed by processor which is a program invoked by the compiler.
Global Declaration section: In this section global variable can be declare.
Main( ) : Main is the starting point of the program, from this point execution of program invoke by the compiler.
Subprogram section : In subprogram section user define different user define function can be define.
Step of execution of C program in windows:
Step 1 : Type the program in editor window.
Step 2 : First compile from compile menu select compile (key Alt+f9)
Step 3: Execute the program by using Run menu ( Key Ctrl + f9)
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