Perform the task specified by each of the following statements:

a) Write the function header for a function called exchange that takes two pointers to dou-
ble-precision, floating-point numbers x and y as parameters and does not return a value.
b) Write the function prototype without parameter names for the function in part (a).
c) Write two statements that each initialize the built-in array of chars named vowel with the string of vowels, "AEIOU".

```
a) void exchange(double* x, double* y)
b) void exchange(double*, double*);
c) char vowel[]{"AEIOU"};
char vowel[]{'A', 'E', 'I', 'O', 'U', '\0'};
```