62: Write a program in C++ to find prime number within a range

 

// Write a program in C++ to find prime number within a range. Go to the editor

//     Input number for starting range: 1

//     Input number for ending range: 100

//     The prime numbers between 1 and 100 are:

//     2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

//     The total number of prime numbers between 1 to 100 is: 25

//     **************************************************************************************************

#include <iostream>

using namespace std;

int main()

{

    int start, end;

    cout << "\nInput number for starting range: ";

    cin >> start;

    cout << "Input number for ending range: ";

    cin >> end;

    cout << "\n**********************************************************\n\n";

    cout << "The Prime numbers between " << start << " and " << end << " are: ";

    int a,b=0;

    for (int i = start; i <= end; i++)

    {

        a = 0;

        for (int j = 1; j <= i; j++)

        {

            if (i % j == 0)

            {

                a++;

            }

        }

        if (a == 2)

        {

            cout << i << ' ';

            b++;

        }

    }

    cout << "\nThe total number of Prime numbers between " << start << " and " << end << " are: " << b;

    cout << "\n\n**********************************************************\n\n";

    return 0;

}