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    C++ Questions

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    1.
    Consider

    int a, b;

    int *prt; //A pointer
    int **prtPrt //A pointer to a pointer

    ptr = &a;
    prtPtr = &ptr;

    a. Is this code legal?
    b. What are the values of *ptr and **ptrPtr?
    c. Using no other objects besides those already declared, how can you alter ptrPtr so that is points to a pointer to b without directly touching ptr?
    d. Is the following statement legal?

    2.
    a. ls *&x always equal to x? If not, give an example
    b. ls &*x always equal to x? Uf not, give an example

    3.
    For the declarations
    int a = 5;
    int *ptr - &a;

    what are the values of the following?
    a. ptr
    b. *ptr
    c. ptr == a
    d. ptr == &a
    e. &ptr
    f. *a
    g. *&a
    h. **&ptr

    4
    Give the typr of each identifier declared here and the types of the expressions. Is any expression illegal?

    a. struct X { inta; S *b; };
    b. S z;
    c. S *x;
    d. x->a
    e. x->b
    f. z.b
    g. z.a
    h. *z.a
    j. (*z).a
    k. x->b-z.b
    l. &z
    m. &x

    5
    Is the following code legal? Why or why not?

    int a = a;
    const in & b = a;

    6
    What is worng with omitting a space in *x/*y?

    © BrainMass Inc. brainmass.com October 10, 2019, 12:33 am ad1c9bdddf
    https://brainmass.com/computer-science/cpp/c-questions-296370

    Solution Preview

    1. This should loook like this (after fixing syntax prob;lems in names):

    int a, b;

    int *ptr; //A pointer
    int **ptrPtr; //A pointer to a pointer

    ptr = &a;
    ptrPtr = &ptr;

    a. Is this code legal?
    - Yes, this code is legal.

    b. What are the values of *ptr and **ptrPtr?
    The value of *ptr is equal to a. The value of **ptrPtr is also equal to a.

    c. Using no other objects besides those already declared, how can you alter ptrPtr so that is points to a pointer to b without directly touching ptr?

    *ptrPtr = &b ;

    d. Is the following statement legal?
    ??? (nothing is shown)

    2.
    a. ls *&x always equal ...

    Solution Summary

    C++ questions are answered.

    $2.19