C programming is a general-purpose, procedural, imperative computer programming language.
Importance of C Language
C is called as a robust language, which has so many built-in functions and operations, which can be used to write any complex program.
Generally, we use to call C as a middle level language. Because, the ‘C’ compiler combines the capabilities of an assembly language with the features of a high-level language. Therefore, it is best for writing both system software and business packages.
‘C’ Programs are efficient and fast.
C is highly portable, that is, ‘C’ programs written on one computer can be run on another with little (or) no modification.
‘C’ language is best for structured programming, where the user can think of a problem in terms of function modules (or) blocks.
It has the ability to extend itself.
It was named ‘C’ because it is an offspring of BCPL (Basic Combined Programming Language) which was popularly called ‘B’ language.
General form of a ‘C’ program
The general form of C program is as follows −
/* documentation section */
preprocessor directives
global declaration
main ( ){
local declaration
executable statements
}
returntype function name (argument list){
local declaration
executable statements
}Example
Following is the C program by using function with no arguments and with return value to perform addition −
#include<stdio.h>
void main(){
//Syntax for addition (function has int because we are returning values for function//
int sum();
int add;
add = sum();
printf("Addition of two numbers is : %d",add);
}
int sum(){
//Declaring actual parameters//
int a,b,add;
//Reading User I/p//
printf("Enter a,b :");
scanf("%d,%d",&a,&b);
//Addition operation//
add=a+b;
//Returning value//
return add;
}Output
When the above program is executed, it produces the following result −
Enter a,b :4,6 Addition of two numbers is : 10