Functions

Writing Functions (Syntax 5.1 : Function Definition)

To create a function, we must supply its name, return type, and a list of parameters and their names.
```
double future_value(double p)
```
For the duration of the function, the parameter is stored in a parameter variable (in this example, p).
The body of the function is delimited by braces (just like main()):
```
double future_value(double p)
{
   . . . 
}
```

Code is included to perform the computation. The result is returned to the caller function.

double future_value(double p)
{
   double b = 1000 * pow(1 + p / 100, 10);
   return b;
}