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Prime Number in C++

Program to determine whether a given number is prime or not



  • #include<iostream>

  • using namespace std;

  • int main()

  • {

  • int num;

  • cout<<”Enter Number”<<endl;

  • cin>>num;

  • int flag=0;

  • for(int i=2; i<num/2; i++)

  • {

  • if(num%i==0)

  • {

  • flag=1;

  • break;

  • }

  • }

  • if(flag==0)

  • {

  • cout<<”Number is prime”;

  • }

  • else

  • {

  • cout<<”Number is not prime”;

  • }

  • return 0;

  • }


Output –

Enter Number

7

Prime



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