WAP to print all prime numbers, ending with digit '7', in descending order.

#include<iostream.h>

#include<conio.h>

#include<process.h>

void main()
{
int start, end , flag = 0, r ;

cout<<" \n Enter the number to start with :";
cin>> start;

cout<<" \n Enter the number to end with :";
cin>>end;

if(start>end)
{
cout<<"\n Invalid Input.";
getch();
exit(1);
}

clrscr();
cout<<"\n The Series :\n ";

for(int i = end ; i>=start ; i--)
{
flag = 0;

for(int j = 2; j< = i-1 ; j++)
{
r = i%j;
if(r == 0)
{
flag = 1;

}
}

if(flag == 0)
{
if(i%10 == 7)
cout<< i << " ";
}

}
getch();
}