how to give equation to a program

[mrm40]

How can i give an equation to calculate?

For example:

cin>> equation;
//equation is y = 5*(x/2);

then:
cin>>x;
//x is 6;

then:
// y = 5 * ( 6 / 2 ) = 15;
cout<< y;
//y is 15;

the equation needs to be entered from input by the user.

I'm using visual studio 2010 c++ console application.

[Rehan FASTian]

cout << "Enter x: ";
int x;
cin >> x;

double y = 5*(x/2.0);

cout << "y = " << y << endl;

[mrm40]

thank you rehan,

But the equation needs to be entered from input by the user.

[Bourgond Aries]

You'll probably need to use some kind of interpreter of the string. I've never heard of a built-in equation system.

[mrm40]

Yes Bourgond thank you,
I'll do that. i thought there might be some other ways.

[Rehan FASTian]

@mrm40: Do post your code here when done, I'm curious to see it.

[mrm40]

@reham:
till i complete my code you can see the algorithm I'm going to follow,

http://en.wikipedia.org/wiki/Shunting_yard_algorithm

@bourgond: what is your idea?