[spoiler title=”Lesson Video”]
Direct Download of Video (For mobile / offline viewing)(right click > save target as)

[/spoiler]

[spoiler title=”Lesson Source Code”]

```#include
#include
using namespace std;

int main(){

// 1 + 3
// i + j
// +, -, *, /, %    -- % is remainder 10%3   10/3 then give me the remainder,  1
//a, b ,c.   total = a+b+c;   total = 10;  total = total+a+b+c;  total += a+b+c;
// +=, -=, *=, /=

//Homework: Creating a simple interest calculator -- futureMoney = principle*(rate*time);
//Creating a compound interest calculator

int years = 0;
double APR = 0.0, principal = 0.0, total = 0.0;

cout < < "Enter your starting capital: ";
cin >> principal;

cout < < "\nEnter your APR (ex: 8.0% = 8):  ";
cin >> APR;

cout < < "\nHow many years will your invest this money for: ";
cin >> years;

APR /= 100;
total = principal * (  pow((1+APR),years)  );
cout < < "\nThe amount in your account after: " << years << " years will be: " << total << endl;

system("PAUSE");
return 0;
}
```

[/spoiler]

Homework is described and should be submitted here: http://beginnerscpp.com/forums/index.php/topic,55.0.html

Cmath
Cmath is a library that is used to perform mathematical functions in C++ programs. You could always create functions of your own to perform the tasks in this library (when you learn functions down the line). For a more complete listing of functions available inside the cmath library click here

Raising a number to a power
Raising a number to a power is very easy in C++ using the Cmath library. The reference linked above should show you examples. For powers you would use pow(number, powerRaisedTo); as your command.