COP3014 Milestone 3 All TopHat Questions (Chapters 12-15)

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123480

"ptr" is a pointer to a double. A double variable occupies 8 bytes in memory. If the current value in "ptr" were 123456, what is the value in ptr after the following line (please use decimal values instead of hex for your math) ptr = ptr + 3;

address (memory address, byte address)

A pointer is a variable that can hold the ___________ of another variable of the same type

A single struct variable would pass by A value B reference C address

a (t)

An internal variable in a struct could involve dynamic memory a True b False

append

An output file opened in __________ mode will add to the current file contents instead of deleting the contents upon opneing the file.

(Create a pointer of the required type Use the new operator to allocate memory and store the address in the pointer Dereference the pointer to use the value Use the delete operator to clear the allocated space)

Arrange the following in the order of operations required to use a dynamically allocated variable

Consider the following function declaration: int count (char *st) If you had a for loop (loop variable i) iterating through the C-String st in the function, which of the following lines would result in an error? (a) cout<<st[i]; (b) st[i++] = 'X'; (c) cout<<*st[i]; (d) cout<<*(++st);

14047

Consider the struct Employee. It has 4 data members - a cstring of size 30, an integer, a double, and a char. An array of Employee structs begins at the address 12800. What is the address of element 29 of the array?

How many bytes of space is occupied by 1 variable (object) of the following struct? struct Item {char itemID[10]; int quantity; double price; char name[50]; };

If we pass a dynamic array by address, which of the following is FALSE? a 2 functions will have 2 pointers (1 each) pointing at the same area of memory b If we dereference the pointer in the function and make changes to dynamic data, the changes will persist when we return to the calling function c The pointer created in the function is local to the function and will be destroyed when we return from the function d Since the link from the called function to the dynamic memory is destroyed upon return, the dynamic memory is deallocated.

(x++ - x=x+1; arr[i] - *(arr+i); structPtr->inside - *(structPtr).inside; !(x>0) - x<=0)

Match the equivalent operators. You may assume all the variables (with compatible types) have been declared and initialized correctly.

(Input - ifstream; output - ofstream)

Match the file stream with its purpose

(Binary File - Stores the values as they would be stored in memory (in machine readable form); Text File - Stores all values as strings (human readable form))

Match the file type with their descriptions

(Pass by Value - int function(int x); Pass by reference - int function(int &x); Pass by address - int function(int *x);)

Match the function prototype with the method of passing

(Create the file objects (variables of type ifstream or ofstream) Open the files and check if they have been opened correctly Perform the I/O operations using the file objects instead of cin/cout Close the files)

Order the following in the sequence of steps required to properly perform File I/O in C++.

b (f)

Passing a dynamic 2-dimensiponal array into a function requires the number of columns a True b False

a (t)

Pointer arithmetic is always done in units of the type size (any addition or subtraction of a value 'x' from a pointer will actually add or subtract x * type size) a true b false

Pointers are essentially numbers. What C++ primitive data type is the "closest match" to a pointer in terms of the values being stored on a contemporary machine? a int b float c long d double

reference

Stream objects will always pass by _________

Text files must be saved with a ".txt" extension for C++ to open and interact with them. a True b False

Text files store data as strings, with each character occupying a byte of space. Binary files store values the same way the data would be stored in memory. The integer value 1234567 will occupy 4 bytes in a binary file. How many bytes would it occupy in a text file?

The internal variables of a struct can only be accessed in the order they were specified in the declaration a True b False

a (t)

The name of an array is a pointer to the starting address of the array a True b False

dereference

To get the value in a dynamic variable, we have to ___________ the pointer that stores its address

reference

Unless specified otherwise, a stream object will always pass by ____________

value

Unless specified otherwise, a struct object (variable) passes by ________

a (t)

Variables declared in the heap are unnamed and may only be accessed through a pointer Select an answer and submit. a True b False

a (t)

We can access the same chunk of dynamic memory from different functions as long as we have a pointer to that memory chunk. a True b False

cout<<cop3014.roster[0].dateOfBirth.year;

We have a "Course" struct that constants an array, called "roster", of 20 "Student" struct variables. Each student struct contains a Date struct variable called "dateOfBirth". Each Date variables contains 3 integers, called "Month", "day", and "year". If the main function contains a single Course struct variable, called "cop3014", how would you print the year of Birth of the 0th student in the Course variable? Please do not use extra spaces in your line of code

We have a Grade structure, which consists of the following elements: AssignmentName: c-string of 45 characters PossiblePoints: integer ReceivedPoints: double If a char occupies 1 byte, an int occupies 4 bytes, and a double occupies 8 bytes, what is the size (in bytes) of one object of the Grade sturcture?

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