C++ Program to Check Prime Number

Here you will get an example code of C++ Program to Check Prime Number.

How to check prime number ?

To check if a number is a prime number, first check if it can be divided evenly by 2. If it can, it is not a prime number. If not, divide it by successive numbers until you either reach the number itself or find a divisor that evenly divides the number. If the number itself is reached, it is a prime number.

Example code of C++ Program to Check Prime Number

#include<iostream>

using namespace std;

int main()

{

int num,i,flag=0;

cout<<"Enter a Numbers: ";

cin>>num;

for (i = 2; i <= num/2; ++i)

{

if (num % i == 0)

{

flag = 1;

break;

}

if (flag == 0)

printf("%d is a prime number.", num);

else

printf("%d is not a prime number.", num);

return 0;

}

Output

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C++ Program to Check Prime Number

C++ Program to Check Prime Number

How to check prime number ?

Example code of C++ Program to Check Prime Number

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