Q. WAP to print prime nos. in a given range

#include<conio.h>
#include<iostream.h>

void main()

{ clrscr();
  float a,b,z;
  cout<<"Enter the range below \n";
  cout<<"From ";
  cin>>a;
  cout<<"To ";
  cin>>b;

  for (int i=a;i<=b;i++)
      { int ret=0;
for (int k=1;k<=i;k++)
   { z=i%k;
     if (z==0)
{ ret++;
}
   }
if (ret==2)
  { cout<<i<<" is a prime no. \n";
  }
      }
  getch();
}