1. C PROGRAMME TO IDENTIFY
WHETHER A NUMBER IS PRIME OR
COMPOSITE
BY-SAURABH KHETAN

2.  The prime numbers are those numbers
which are divisible by themselves and
unity.
 We will implement this theory while
constructing a program to find whether a
number is prime or composite in C
language.
 The main logic behind finding whether a
number is prime number or not, we need
to keep on dividing the number with
number occurring before it.
 The program can be written as follows:-

3. #include<stdio.h>
int main()
{
int num, i=2;
printf(“enter a number”);
scanf(“%d”,&num);
while(i<=num-1)
{
if(num%i==0)
{
printf(“the entered number is
composite”);
break;
}
else
i++;
}

4. if(i==num)
{
printf(“the entered number is a
prime number”);
}
}

5.  The following program can be made to
run in any of the compilers.
 For example:- Turbo c, Microsoft visual
studio.
 Only for the compilers supported by
windows operating system.
 This is a simplest program to identify
whether a number is prime or composite.
 The user just have to enter the desired
number and the result is displayed.
 Can be used to make school children
comfortable with concept of the prime
numbers.

6.  For any more details about this program
you can enquire by sending me an e-mail.
 saurabh.khetan53@gmail.com
 Any query regarding it will be solved as
soon as possible.
 Do mention your problem in detail while
sending me an e-mail.