Make a calculator in C++

Here is how to make a calculator in C++ language.

[sourcecode language='cpp']
#include
#include void main()
{
int num1,num2,res;
char ch,choice,count;
count=0;
z:
cout<<"*******************************************************************************"< cout<<"Press * for multiplication, + for addition, - subtraction, / division"< cout<<"*******************************************************************************"< cin>>ch; count++;
switch(ch)
{
case ‘+’:
cout<<"/////////////////////////"< cout<<"Enter two numbers"< cout<<"/////////////////////////"< cin>>num1>>num2;
res=num1+num2;
cout<<"Your query returned"<<" "< break;

case '-':
cout<<"/////////////////////////"< cout<<"Enter two numbers"< cout<<"/////////////////////////"< cin>>num1>>num2;
res=num1-num2;
cout<<"Your query returned"<<" "< break;

case '*':
cout<<"/////////////////////////"< cout<<"Enter two numbers"< cout<<"/////////////////////////"< cin>>num1>>num2;
res=num1*num2;
cout<<"Your query returned"<<" "< break;

case '/':
m:
cout<<"/////////////////////////"< cout<<"Enter two numbers"< cout<<"/////////////////////////"< cin>>num1>>num2;
if(num2==0)
{
cout<<"Sorry, please enter a value which is not zero"< goto m;
}
res=num1/num2;
cout<<"Your query returned"<<" "< break;
default:
cout<<"Please select anyone option"<

};
if(count==3)
{cout<<"You already used the program thrice...";
exit(0);}
cout<<"::::::::::::::::::::::::::::::::::::::::"< cout<<"Do you want to continue? (Press Y/N)"< cout<<"::::::::::::::::::::::::::::::::::::::::"< cin>>choice;
if((choice==’Y')||(choice==’y'))
{goto z;}
}
[/sourcecode]

This program also has an inbuilt limitation of limiting the usage upto three times only.