C++ Jeopardy - Now with Unix!

Methods

100

Which one copies, pass-by-value or pass-by-reference?

Pass-by-value

200

void printMe(int& i)
{
 cout << i << endl;
}

/*********************/
printMe(1);
printMe(2);

1
2

300

void printMe(int& i)
{
 cout << i << endl;
}

/*********************/
int i = 0;
printMe(i);
i = 5;
printMe(5);

0
5

400

void printMe(int& i)
{
 cout << i << endl;
}

/*********************/
int n = 37;
++n;
printMe(n);

38

500

void changeMe(int& i)
{
 i = 5;
}

/*********************/
int n = 37;
changeMe(n);
cout << n << endl;

5

Random

100

string line = "Bob";
cout << "Hey! " << line << endl;

Hey! Bob

200

If I want to read an entire line of text into a string called 's' (i.e., not just a single word). HINT: getline()

std::string s;
std::getline(std::cin, s);

300

What type do you use to read from a user? (hint: c??)

cin

400

int x = 5;

if(x == 5 || x % 2 == 0)

{
   cout << "yes" << endl;

}
else
{
  cout << "no" << endl;

}

yes

500

vector<double> vec;

for(int i = 0; i < 10; ++i)

{

    vec.push_back(i);

}


cout << vec.size() << endl;

10

Vectors

100

What are the two best kinds of loops to use for printing out the contents of vectors?

for
for-each

200

I have a vector of string's called 'vec'. How do I print out the _third_ element?

cout << vec.at(2) << endl;

300

vector<string> vec;
vec.push_back("bob");
vec.push_back("shaq");
cout << vec.at(2) << endl;

crashes because of a runtime error
try it outself at http://goo.gl/nbjLKN

400

What's the difference between accessing vectors using [] and calling .at()? e.g.,

cout << vec.at(0) << endl;
cout << vec[0] << endl;

.at(index) checks whether index is valid, but [] does not

General/UNIX

100

I have a file called

movies.csv

and I want to do a case-insensitive search for 'mad max'.

grep -i "mad max" movies.csv

200

void printMe(std::string& s)

Does the above function use pass-by-value or pass-by-reference?

pass-by-reference

300

What do I need to include to get access to sin, cos, tan, etc.?

cmath

400

I have a file called "weather_reports.csv" that looks like this:

Zip,High,Low
08108,78,61
08033,77,60
19093,79,63

I just want the second columns, the high's.

HINT: use the 'cut' command.

cut -d',' -f2 weather_reports.csv

500

What's wrong with this piece of code?

double CalculateMinimumDatingAge(int age)
{
	return age / 2 + 7;
}

"age / 2" does not do fractions. You need to tell the computer to use the FPU by doing "age / 2.0"