Did my programming teacher grade my test wrong?

Question

I'm currently in a class for C++. I just took a midterm, and I thought all my answers were very good, but some didn't get any points. I just wanted to find out what I did that was wrong about them, not to doubt my teacher, but to just know how I got my answer wrong.

The first one that I got wrong was:

Using three different rules for creating valid variable names, make up an example for each that would NOT compile.

My answer was:

int ex ample
int 2example
char cout

Here I'm assuming its the Char, I feel as though I should have called a different variable.

2. (This ones a longer one)

What is the EXACT output of the following program given that the user enters the following inputs:

P
Maria Lucelli
1000

char status;
string name1;
string name2;

int amount;

cout << "What is the customer’s status ?";
cin >> status;

if (status == 'P')
    cout << "Preferred customer, eligible for gold card."<<endl;
else
    cout << "Regular customer."<< endl;

cout << "Enter full name :";
cin >> name1 >> name2;

cout << "Thank " << name1 << " for his/her business" << endl;

if (status == 'P')
{
    cout << "Ask how much to transfer to 2.9 %";
    cin >> amount;
    if (amount > 1000)
        cout << "This may take a moment to verify.";
    } else
        cout << "Have a nice da y.";

My answer was:

What is the customers status? P
preferred customer, eligible for gold card.
Enter full name: Maria Lucelli
Thank Maria for his/her business
Ask how much to transfer to 2.9% 1000
have a nice day.

I literally copied it letter by letter. I really would like to know what I did wrong for this one.

3.

Write a block of code that demonstrates the concept of overflow.

My answer was:

int a;
a=INT_MAX;
cout<<a+5;

When I ran this, it overflowed to a negative number and yadda yadda. Could I have misunderstood what overflow means?

Answer 1

The first one that i got wrong was: Using three different rules for creating valid variable names, make up an example for each that would NOT compile.

My answer was

int ex ample
int 2example
char cout

last one is wrong. Probably you have hoped to have symbol collision with std::cout, but this can only when definition is done in global scope and using namespace std; is used. In other cases new cout will overshadow cout even when using namespace std; is used.

Use of keyword could be a good example: char switch; will not compile. Or redefinition of symbol.

2.(This ones a longer one) What is the EXACT output of the following program given that the user enters the following inputs:

First off all this code contains invalid characters. Fix it then just run it to see the outcome: https://godbolt.org/z/Y51z1Ye75

Your answer is mix of input with output.

3. Write a block of code that demonstrates the concept of overflow.

Answer:

int a;
a=INT_MAX;
cout<<a+5; 

Here problem is a question. There are many kinds of overflows. You presented proper example of "integer overflow", but there is also "stack overflow", or "buffer overflow". It is possible there is also other kind of overflows which just do not pop up in my mind. So it is possible that teacher expected other kind of overflow - in such case problem is imprecise question