Multiple Choice Quiz

1. Which of the following is NOT a correct way to indicate a newline at the end of "Hello World!"?

(A) std::cout << "Hello World!"; std::cout << "\n";

(B) std::cout << "Hello World!" << std::endl;

(C) std::cout << "Hello World!\n";

(D) std::cout << "Hello World!\endl";

2. Which of these numeric types is represented using the fewest bytes in C++?

(A) long

(B) char

(C) float

(D) double

(E) long long

3. If I have an std::string called name, with the contents "John Wilkes Booth", and another called middle, which of the following techniques will set middle to be "Wilkes"?

(A) middle = name.substr(5,6);

(B) middle = name[5]+name[6]+name[7]+name[8]+name[9]+name[10];

(C) middle = (name + 5).resize(6);

(D) middle = name[5:11];

(E) middle = std::extract(name, 5, 11);

4. What is the value of y after these lines are run in C++?
int x = 6;
int y = 4 + x * 3 - 1;

(A) 20

(B) 21

(C) 6

(D) 29

5. What error is in the following function?
 template <typename T>
 T & Multiply(const T in1, const T in2) {
 return in1 * in2;
 }

(A) It is returning a reference to a temporary value, which may corrupt memory

(B) The multiply operator cannot be used by all types, so the template won't compile

(C) If the inputs are marked const, the return value must be const as well

(D) The Multiply function is in the standard library, so this function would conflict

(E) More than one of the above is true

6. You want to execute code if either var1 is true or var2 is true, but not if they are both true. Given that both variables are type bool, three of the following techniques work; which one will NOT work?

(A) if ( var1 ^^ var2) { ...code... }

(B) if ( (var1 || var2) && !(var1 && var2) ) { ...code... }

(C) if ( var1 != var2) { ...code... }

(D) if ( (var1 && !var2) || (var2 && !var1) ) { ...code... }

7. What is the output of the following program:
 std::map<int, std::string> star_map;
 star_map[0] += "*";
 star_map[2] += "*";
 star_map[3] += "*";
 star_map[0] += "*";
 std::cout << star_map[0] << "-" << star_map[1] << "-" << star_map[2];

(A) --***

(B) Nothing; it will crash because star_map[1] can't be printed.

(C) **--*

(D) *--**

8. What is the output from the following code fragment?
 char var1 = 'b';
 if (var1 == 'b') {
 int var2 = 10;
 }
 std::cout << var1 << var2 << std::endl;

(A) b10

(B) 10b

(C) 10

(D) Nothing: it is illegal C++ code

(E) Nothing: the code is legal, but produces no output

9. Given the following templated function:
 template <typename T>
 void PrintBoth(T in1, T in2) {
 std::cout << in1 << ", " << in2 << std::endl;
 }
Which function call will cause a compilation error?

(A) PrintBoth(nullptr, nullptr);

(B) PrintBoth("12", "34");

(C) PrintBoth("12", 34);

(D) PrintBoth(12, 34);

10. If you make a function call TestFunction(91), which version of the function will be called?

(A) void TestFunction(double param);

(B) void TestFunction(char param);

(C) void TestFunction(int param1, int param2=0);

(D) void TestFunction(std::string param);