Calculator in c++

 /*CACULATOR*/
#include <iostream.h>
#include <conio.h>

void main()
{cout<<"                    CALCULATOR         "<<endl;
float  x,y;
char z;
float result;
while(cin>>x>>z>>y)
{
switch(z)
{
 case '+':
 result=x+y;
 break;
 case '-':
 result=x-y;
 break;
 case '*':
 result=x*y;
 break;
 case '/':
 result=x/y;
 break;
 default:
 cout<<"invalid entry"<<endl;
 continue;/*start next loop iteration.*/
}
cout<<result<<endl<<endl;}
 getch();
 }