C++ Program for Standard calculator using switch case for beginer

//C++ program for standard calculator using switch case
#include<iostream.h> //header file
#include<conio.h>
int main()
{
clrscr();                       //clear screen
float a,b,c,d,x,y;         //variable declaration
int ch;
cout<<"**********CALCULATION MENU by The Jhasaketan**********"<<"\n";
cout<<"1.Addition"<<"\n";
cout<<"2.Substraction"<<"\n";
cout<<"3.Multiplication"<<"\n";
cout<<"4.Division"<<"\n";
cout<<"Enter your choice:";
cin>>ch;
switch(ch)
{
{
case 1:
cout<<"Enter first number:\t";
cin>>x;
cout<<"Enter second number:\t";
cin>>y;
a=x+y;
cout<<"The Addition result of two numbers is=\t"<<a;
break;
}
case 2:
{
cout<<"Enter first number:\t";
cin>>x;
cout<<"Enter second number:\t";
cin>>y;
b=x-y;
cout<<"The Substraction result of two numbers is=\t"<<b;
break;
}
case 3:
{
cout<<"Enter first number:\t";
cin>>x;
cout<<"Enter second number:\t";
cin>>y;
c=x*y;
cout<<"The Multiplication restlt is=\t"<<c;
break;
}
case 4:
{
cout<<"Enter first number:\t";
cin>>x;
cout<<"Enter second number:\t";
cin>>y;
if(y!=0)
{
d=x/y;
cout<<"The Division result of two numbers is=\t"<<d;
}
else
{
cout<<"It is Impossible";
}
break;
}
default:cout<<"Wrong Choice!!!!!";
}
getch();
return 0;
}

Some screen shots of the program: