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C++ = Code to check number wheater it is prime or not.

Code no 1= Without any other function with using another function.

#include <iostream>

using namespace std;

int main()

{

int number;

bool prime=true;

cout<<"Enter any number : ";

cin>>number;

if (number<=1)

{

prime=false;

}

else

{

for (int i=2;i<number;i++)

{

if (number%i==0)

{

prime=false;

break;

}

}

}

if (prime)

{

cout<<"The number is a prime number."<<endl;

}

else

{

cout<<"The number is not a prime number."<<endl;

}

}
Code no: 2= With using another function

#include <iostream>

#include <cmath>

using namespace std;

bool prime(int n)

{

if (n<=1)

{

return false;

}

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

{

if (n%i==0)

{

return false;

}

}

return true;

}

int main()

{

int number;

cout<<"Enter any number : ";

cin>>number;

if (prime(number))

{

cout<<"The number is a prime number."<<endl;

}

else

{

cout<<"The number is not prime number."<<endl;

}

}
Result:




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