Exercise 09.06.08

The text for this exercise reads:

(*2) Modify the desk calculator so that it can be invoked from main() or other functions as a simple function call.

This is actually very easy. Use the calculator code from 6.1.7

double evaluate(const char* expression)
{
 istrstream a(expression);
 input = &a;
 return expr(true);
}

double evaluate(string str)
{
 return evaluate(str.c_str());
}

Simple isn't it?.

Back to the Exercise Page
Back to my Home Page