Purpose of the given code:

The main purpose of the given code is to find the product of two numbers; the process involved is getting two numbers of data type "double" from the user, then calculating the sum of the two numbers, and storing it into another variable and finally displaying the sum as an output to the user.

Syntax error:

An error which occurs on the source code of a program is referred as "syntax error" because the computer programs strictly follow the syntax rules.

• If the code fails to prove its language syntax format, then the compiler will throw errors.

List of errors identified in the given code:

The code that is given contains some errors and those are listed as follows:

Error 1:

The definitions of the keywords are being defined in the header file should not end with a semicolon.

"Line 1" of the program should not contain a semicolon ";" in the header file "#include<iostream>".

Error statement:

#include <iostream>;

Corrected statement:

#include <iostream>

Error 2:

When a variable is declared as a constant item, no modification can be made to that value of the variables that constant hold. The value may change during the runtime.

In "Line 4", the variables values cannot be constant when the user enters the value at the runtime and the keyword "const" should be removed...