## C++ Program to check whether number is prime or not.

You must have basic knowledge of C++ programming language and variable , while loop and if..ealse and for loop

### What is prime number?

The prime number mean which postive integer number is divided by 1 or itself.

The prime number such as 13 that is division itself and 1.

In this example we show the prime number is [1,2,3,5,7,11,13,17,19,22]

###

Example 1: Program to Check Prime Number given by user.

#include<iosteam>

#include <conio.h>

int main ( )

{

int m,j,flag=0;

cout<<"please enter the any positive number";

cin>>m;

for(j=2;j <=n/2;i++)

{

//this condition is use for non prime

if (m%j==0)

{

flag=1;

break;

}

}

if(flag==0)

cout <<m <<"This number is prime";

else

cout <<m <<"This number is not prime";

return 0;

getch ();

}

}

Result

------------------------

Please enter the any positive numer

8

8 This number is not prime

###

Example2: Program to Check Prime Number

#include<iosteam>

#include <conio.h>

int main ( )

{

int m=7,j,flag=0;

for(j=2;j <=n/2;i++)

{

if (m%j==0)

{

flag=1;

break;

}

}

if(flag==0)

cout <<m <<"This number is prime";

else

cout <<m <<"This number is not prime";

return 0;

getch ();

}

}

Output

------------------------

7 This number is prime