cs 141 exam 2 review1 game show!. cs 141 exam 2 review2 whats wrong with this function bool foo...

Cs 141 Exam 2 Review 1

Game Show!


Whats wrong with this function

bool foo (int, double){return true;

}



void doubleIt(int num){num = 2* num;

}



int double bar(int num){return num;

}



void doubleIt(int num){return 2* num;

}


void baz (int num1, int &num);

Which is the call by value parameter and which is the call by reference parameter?


What does call by value mean?


What does call by reference mean?


• In what ways do return values and call-by-reference parameters accomplish the same thing. In what ways are they different?


• What are the limitations of return values versus call-by-reference parameters?


void bar(int numArray[]){

}

Is numArray call by value or call by reference?


What do you have to do to make an array parameter call by value?


What is the purpose of assertions?


What is meant by a global variable?


Where are global variables declared?


• If the following function compiles then what is a?

void func1(int b){ a = b;}


int a=10; what output?

void func2(int b){ int a; a = b;} void func3(){ cout << a;} int main(){

func2(5);func3();

}


• C-strings are a bit like our big Integers. We had arrays of 1000 locations we could use to store digits, but for any given big Integer, we may only use a few of those locations. C-strings are an array of characters but for any given string we may only use a few of the characters in the full array.

• In bigIntegers, how did we determine how many locations hold the digits of our number?

• In C-strings, how do we determine how many locations hold the characters in our string?


• We've learned quite a few preexisting functions that we can use when programming.

• What functions did we use to generate random numbers?


• What functions did we use to convert c-strings to numbers?


• What functions did we use to test if a character was whitespace? Or a digit?


• Some pre-existing functions we've learned belong to classes.

• What function did we learn to get the c-string equivalent of a C++ string?


• What is the difference between exit and return?


• Do return and exit have a different effect when called in the main function?

• Do return and exit have a different effect when called in another function?


• Is int main() in our basic template a function?


• What is special about the main function?


• What is the difference between break and continue?


• What function did we learn to open a file?


What is the type of variable used for output files?


What is the type of variable used for input files?


• What is the difference between get and peek?


• What two functions can be used to allocate memory dynamically?


• If you allocate memory with malloc, what function should you use to deallocate it?


• If you allocate memory with new what function should you use to deallocate it?


• What is the difference between a plain array of characters and C-string?


Suggest an assertion to test the preconditions of this function:

/* precondition: a and b are positive */void func7(int a, int b);


• What is a function prototype?• How is it useful?


• Propose a struct to hold a song type


• Declare a variable of type song and initialize it to represent an actual song that you like.


• Propose a struct to hold a BigInteger type?


• Declare a variable of type BigInteger and initialize it to represent the variable 89.


How do you test if a file open succeeds?


How do you test if a file read or write succeeds?


How do you test if you read all the contents of a file?


If I did this ./a.out inputFile.txt

What would argc be?


If I did this ./a.out inputFile.txt

What would argv[1] be?


What type/types hold the following: 0,1,-1,2,-2,...


What is the main difference between the values that can be stored in an int variable and the set of all integers that you learned about in math?


What type/types hold the following:0,1,2,3,4,...


What type/types could be legitimately substituted for TYPE

TYPE foo = 4;


What is the main difference between a float and a double?


int bar = 23/4;

What is bar?


int foo = 23%4;

What is foo?


float bop = 23/4;

What is bop?


int baz;

What is the value of baz?


What are three ways to initialize the value of a variable?


What would happen if you did this:

const int foo = 5;

foo = 10;


Is this a valid comment?

/* Written by Jeanna


Is this a valid comment?

\\ Written by Jeanna


What are two ways to write a valid comment?


Declare a variable to hold someone's last name.


Declare a variable to hold someone's age in years.


Declare a variable to hold someone's hourly wage.


Declare a variable to hold someone's middle initial.


If you wanted to declare a variable to keep track of the number of times someone blinks in a year, what would be a good choice for the type and why?


What does != mean?


What is the difference between = and ==?


What does && mean?


What does || mean?


What is the difference between:cin >> foo;cout << foo;


What type/types hold the following: 'a' '\n' '4'


Which of these lines is not like the others?

foo++;++foo;foo+=1;foo = foo +1;foo+1;


What is wrong with this?

if ((answer == ‘y’) | (answer == ‘Y’)){cout << “User entered yes\n”;

}


What is wrong with this?

if ((answer == ‘y’) && (answer == ‘Y’)){cout << “User entered yes\n”;

}


What will happen if you do this?

num =3;if (num =2){

cout << “Number is 2\n”;} else {

cout << “Number is not 2\n”;}


What will happen if you do this

num =3;if (num !=2){

cout << “Number is not 2\n”;} else if (num < 4) {

cout << “Number is less than 4\n”;} else if (num >0){

cout << “Number is greater than 0\n”;}


What is the value of BAZ below?

enum SillyNames {FOO=1, BAR, BAZ};


Declare an enum of the days of the week.


What is the advantage of declaring an enum?


Are these two boolean expressions the same?

(x >=10)

((x ==10) && (x > 10))


There are 3 different types of clauses in an if statement: if, else if and else

How many of each can you have?


Identify the following in this loop: InitializationActions, LoopCondition, UpdateActions, BodyStatements, CompletionActions

total =0;i=0;while (i< 10){total = total +i;i++;}cout << total;



for(i=0; i< 10; i++){total = total +i;}cout << total;



howMany=0;while(input_stream >> num){howMany++;total = total + num;}average = total/howMany;


If homMany and total are ints, what problem will be have computing average? What could we do to fix the problem? What type should average be?

howMany=0;while(input_stream >> num){howMany++;total = total + num;}average = total/howMany;


int numbers[3];

How many ints are declared?How would you refer to the first one?The last one?Write a for loop to add them all up


int numbers[3][2];

How many ints are declared?How would you refer to first one?How would you refer to the last one?Write a for loop to add them all up.


If you want to read from or write to a file what must you add to our basic template?


#include <fstream>


Declare a variable to hold a file you want to read from


ifstream input_file;


Declare a variable to hold a file you want to write to.


ofstream output_file;


How would you open the file “foo.txt”?


fileVariable.open(“foo.txt”);


If you try to open a file, what type of error should you check for and how do you do that?


Check if weren't able to open the file

fileVariable.open(“foo.txt”);

if (fileVariable.fail()){cout << “Couldn't open the file\n”;}


How would you open the file foo.txt?


What does it mean to have a if statement nested inside a loop?


What does it mean to have nested for loops?

What are nested for loops especially good for?


True or false: There are some problems for which you must use a do-while loop. A while loop just won't work.


When is it generally better to use a do-while loop instead of a while loop?


When is it generally better to use a for loop instead of a while loop or do-while loop?


When you get a bunch of compiler errors which one should you fix first and why?


If you are trying to fix a specific compiler error, how can you figure out where the problem is?


What is a fence post error?


If you were going to test this loop what would be three great values of x to test? Why?

cin >> x;for (int i=0; i< x; i++){cout << i;}


Will these do the same thing?for (i=0; i< 3;i++ )

cout << i;

for (i=0;i< 3 ){cout << i;

i++;}


Will these do the same thing?for (i=0; i< 3;i++ )

cout << i;

i=0;while (i< 3 )

cout << i++;


What would you expect to happen if you did this

int numArray[5];numArray[5] = 100;cout << numArray[5];


Whats wrong with this

int numArray[9];for (int i=0; i<=9; i++){

numArray[i] = i;}


Do these all do the same thing?

cout << num << “\n”;

cout << num << endl;

cout << num;cout << “\n”;


What child of a famous British poet is often considered the first programmer?


Ada Byron Lovelace (1815-1852)


Who is the creator of C++?


Bjarne Stroustrup


Who is the creator of the C programming language and a co-author of the UNIX operating system?


Dennis Ritchie


Explain the joke in the name C++


Who coined the term “debugging” and wrote the first compiler for a computer programming language?


Rear Admiral Grace Hopper


Picture of the moth that was the first computer “bug”


Who is this?


Linus Torvalds author and developer of Linux


Who is this?


Steve Jobs, co-founder and CEO of Apple Corporation


Who is this?


Steve Wozniak, co-founder of Apple Corporation


What does IBM stand for?


International Business Machines


Who is considered the founder of IBM?


Thomas J. Watson


Give me an example of function overloading?

cs 141 exam 2 review1 game show!. cs 141 exam 2 review2 whats wrong with this function bool foo...

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