Write a $C++$ program to solve the math equation stated below:

$y=a{x}^3+b{x}^2+cx-d$

Demonstrate the following items in your C$++$ program:

Declaring all variables using at least $3$ different data types.

One of the variables is declared as a global variable.

Prompt the user to enter the values for each declared variable.

Compute the answer according to the above equation.

Next, using the operator precedence and associativity generate one

different answer than the one obtained from the above equation. You

can name the variable $y1$ for the original equation and $y_2$ for the

modified equation.

Compare both computed y$1$ and y$2$ answers using $1$ example of the

relational operator and $1$ example of the logical operator.

Output statements for each of the above items are shown.