pow function not working

This is supposed to be a very simple program but for some reason I cannot get the pow function to work. I keep on coming up with an error that states
"could not find a match for pow(float), am I missing something? Thanks.

Code:

---

// Basic C++ info

#include <iostream>
#include <string>
#include <math.h>

using namespace std;

// Declare Global Variables
float fltNumbac, fltBacpresent, fltDays;

// Modules
void MainMenu();
void BacteriaLoop();

int main()
{
        MainMenu();
        cout << "Day    Number of Bacteria Present" << endl;
        BacteriaLoop();

        return 0;
}


void MainMenu()
{
        cout << " Welcome to the WilliamK99 Bacteria Calculator!" << endl;
        cout << " How Many Bacteria are Present at the Start of the Experiment?";
        cin >> fltBacpresent;
       
        return;
}

void BacteriaLoop()
{
        while (fltDays <=10)
        {
                fltNumbac = fltBacpresent * pow(fltDays / 10);
                cout << fltDays << "          " << fltNumbac << endl;
                fltDays++;
        }
        return;
}

---

You need to link with libm, so add "-lm" to your commendline, e.g.:

Code:

---

gcc x.c y.c -lm

---

--
Mats

I think the problem is that pow() takes two arguments, the base and the exponent, but you are passing only one argument.

The error is because you are calling pow() wrong, and the C++ compiler cannot find a template for the pow() function with one parameter.

http://www.cppreference.com/stdmath/pow.html

Todd

If you want to exponentiate using base e, use exp() instead of pow(). pow() takes two arguments.

Thanks I changed
fltNumbac = fltBacpresent * pow(fltDays / 10);

to

fltNumbac = pow(fltBacpresent, fltDays/10);


and it worked like a charm.