[spoiler title=”Lesson Video”]

Direct Download of Video (For mobile / offline viewing)(right click > save target as)

[/spoiler]

[spoiler title=”Lesson Source Code”]

```
#include <iostream>
#include <cmath>
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.