#include <iostream>
using namespace std;

/* Write a polynomial evaluator that works like this:
            Enter value for x: 3.1
            Enter polynomial to be evaluated (e.g. 3.1*x^2 - 2.0*x^1 + 1.1*x^0 = )
            0.75*x^5 - 1.8*x^3 + 0.3*x^2 + 1.1*x^1 =
            Result is 167.388
*/

int main77() {

	// Read in the value for x
	double x;
	cout << "Enter value for x: ";
	cin  >> x;

	/*
	 * Get and evaluate the polynomial 
	 */

	// Prompt and initialize
	cout << "Enter polynomial to be evaluated (e.g. 3.1*x^2 - 2.0*x^1 + 1.1*x^0 = )" << endl;
	double sum = 0;
	char   op  = '+';

	while ( op != '=' ) {
		/*
		 * Get c x^n term
		 */
		
		// Get inputs
		double c;
		int n;
		char junk;
		cin >> c >> junk >> junk >> junk >> n;

		// Compute x^n
		double term = 1;
		for (int i=0; i < n; i++) {
			term = term * x;
		}

		// Multiply by c
		term = term * c;

		// Add into total
		if (op == '+') {
			sum = sum + term;
		}
		else {
			sum = sum - term;
		}

		// Get the next operator
		cin >> op;
	}

	// Output result
	cout << "Result is: " << sum << endl;

    return 0;
}