cannot be used as a function

[faawis]

i am trying to write a program that calculate the interest of a loan, and i am having a problem with this line.

a=p(pow((1+r), t));

it keeps telling me p cannot be used as a function.

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

using namespace std;

int main()
{
double t, p, r;
int a;

cout<<"what is the amount of the loan"; //ask for the amount of the loan.
cin>>p;

cout<<"enter the interest rate per year";
cin>>r;

cout<<"amount to pay back after t years";
cin>>a;

a=p(pow((1+r), t));
return 0;

[helios]

a=p*(pow((1+r), t));

[faawis]

thank you, that worked