Write a program in C++ to find the prime numbers within a range of numbers

#include <iostream>
using namespace std;
void main()
{
   int num,i,ctr,stno,enno;

    cout<<"Input starting number of range: ";
    cin>>stno;
    cout<<"Input ending number of range : ";
    cin>>enno;
    cout<<"The prime numbers between  : "<<stno<<"and"<<enno<<endl;
 
    for(num = stno;num<=enno;num++)
       {
         ctr = 0;

         for(i=2;i<=num/2;i++)
            {
             if(num%i==0)
{
                 ctr++;
                 break;
             }
        }
       
         if(ctr==0 && num!= 1)
             cout<<" "<<num;
}
     cout<<endl;

      system ("pause");
}

Test Data : 

Input starting number of range: 1 

Input ending number of range : 50 

Expected Output :

The prime number between 1 and 50 are : 

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47