Question

C++ Write a program for the following below.

Write a function fx(x) = x^3 + 2*x^2 + 3

call it in the main() and calculate values for x = 1.0, 2.0, 3.0, ..., 10.0

Also write a two column data.txt file with x and fx

Answer 1

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

double f(double x) {
    return x*x*x + 2*x*x + 3;
}

int main() {
    ofstream out("data.txt");
    out << "x\tfx" << endl;
    for (int x = 1; x <= 10; x++) {
        cout << x << "\t" << f(x) << endl;
        out << x << "\t" << f(x) << endl;
    }
    out.close();
    return 0;
}