The Basic sections of ‘C’ are explained taking an example::

/* A program to calculate average of 5 nos given by the user */

/*----------Defining of Constants and Inclusion Of Header Files------*/

#include

#define M 10

/*------------Start Of The Main Program---------------------------------*/

main()

{

/*----------------Declaration of Variables----------------------*/

int i;

int sum ;

/*-----------------Initialization of Values----------------*/

sum=avg=0;

/*---------------Interaction With User and Receiving Required Data----*/

printf(“Please Enter The Values::”\n”);

for (i=0; i<=M; i++)

{

scanf(“%d”, &n);

sum=sum+n;

}

/*---------------Display Of Final Result with The Computation-----------*/

printf(“The Sum of All The Nos is: %d \n

The Average of All The 10 Nos is: %d\n”, sum, sum/10);

}

2) The various data types supported in C are basically divided into 4 types: primary or fundamental, user-defined, derived and empty data set.

The Primary Data Type are mainly divided into 3 types which are sub-divided into many types like:

1) INTEGER (int): different types of integers are:

int, unsigned int, short int, unsigned short int, long int, and unsigned long int

2) Character (char): different types of characters are:

signed char, unsigned char

3) Floating Point (float): different types of floats are:

float, double, long double

An Example Program to Display Various Primary Data Types::

main()

{

int a; /*------int range : -32,768 to 32,767-------*/

short int c; /*------short int range : -127 to 128-------*/

long int d; /*------long int range : -2,147,483,648 to 2,147,483,647-------*/

float e; /*------float range : -3.4E-38 to 3.4E+38-------*/

double f; /*------double range : -1.7E-308 to 1.7E+308 -------*/

char g; /*------int range : -127 to 128-------*/

a=30007;

c=120;

d=89654785;

e=954651.6216549;

f=1.6E;

g=’M’;

printf (“a=%d\n c=%d \n d=%d \n e=%f \n f=%f \n g=%c\n”, a, b, c, d ,e ,f ,g);

RESULT:

a=30007

c=120

d=89654785

e=954651.6216549

f=1.6E

g=M