C program to find a Number is Prime or not

C program to find a Number is prime or not. It is a simple source code that provides the output of an actual Prime number. Take care of a questions for your interviews or students exam. This is a totally free of cost code.

NUMBER IS PRIME OR NOT IN C

This C program is used find the given number is prime or not by using different statements like looping & unconditional statement. Check the entered value with condition of if(p_flag == 1). If it is satisfies the condition, then print a number as prime.  Otherwise it is not a prime number.

C CODE:

Q: Write a C program to check whether a given input value is Prime number or not.

/* Title: Prime number program
Author: Vinoth Selvaraj
© http://students3k.com
*/
//Header files
#include<stdio.h>
#include<conio.h>
//Global variable
int isPrime(int);

void main()
{
	//Program variables
	int cr,num,p_flag=0;

	clrscr(); //Function to clear previous output
	printf("Enter the value:"); //Display function
	scanf("%d",&num); //Getting input value function
}
int isPrime(num)
{
for(cr=2;cr<num/2;cr++) //Looping statement
{
	if(num%cr==0) //Conditional statement
	{
		p_flag=1;
		break;
	}
}
}

	if(p_flag == 1)
		printf("Number is not prime");
	else
		printf("Number is prime");
	getch();
}