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Cs 141 Exam 1 Review 1

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

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 TYPETYPE foo = 4;

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

What happens if you add 1 to the largest possible int?

Cs 141 Exam 1 Review

What values can ints hold that unsigned ints cannot?

What values can unsigned ints hold that ints cannot?

What values can floats hold that ints cannot?

int bar = 23/4;

What is bar?

int foo = 23%4;

What is foo?

float bop = 23.0/4;

What is bop?

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;

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;

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

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?

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 does procedural abstraction or information hiding or black box design mean?

What is the purpose of assertions?

How can you turn off assertions before you release code to users?

Why would you turn off assertions before you release code to users?

Give me an example of function overloading?

What is meant by a global variable?

Where are global variables declared?

What is the type of variable used for output files?

What is the type of variable used for input files?

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?

What do you add to the file open call if you want to append to 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?

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