Topics covered: Order of operations in C++, simple interest formula / calculation, compounding interest formula calculation

Source code:

```
#include <iostream>
using namespace std;
int main(){
//PEMDAS
//In math -- Parenthesis, Exponents, Mult / division, add / sub
//In C++ Paren. -- Evaluated first
//Mult / Div
//Add / Sub -- Last in priority
//Evaluates left to right
//1*5-4*3
//5-12
double principal=0, rate=0, time=0;
cout << "What is the initial investment? ";
cin >> principal;
cout << "What is annual percentage yield (APY -- APR)? ";
cin >> rate;
cout << "How many years will this be invested for? ";
cin >> time;
cout << "The amount of money at the end of the time period will be: ";
return (0);
}
```

**Order of operations**

In C++, there is an order of operations, much like the one that we see in traditional mathematics. In C++, the order of operations is as follows:

- Parenthesis
- Multiplication and Division
- Addition and subtraction.
- “Left to right”

**Cmath library**

The Cmath library contains a lot of useful things, for instance square root (sqrt) floating point modulo (fmod / fmodf) and more. In this case we are using ‘pow’ which is used like this: `pow(double, int);`