Ragsdale COMP test 4-6
Given integers i, j , k, which XXX correctly passes three integer arguments for the following function call? addInts XXX; (j, 6 + 7) (i + j + k) (10, j, k +5) (10 15 20)
(10, j, k +5)
Which input value causes "Goodbye" to be output next? int x;cin >> x;while (x >= 0) {// Do somethingcin >> x;}cout << "Goodbye"; -1 0 1 No such value
-1
The numNegatives variable counts the number of negative values in the vector userVals. What should numNegatives be initialized to? vector<int> userVals(20);unsigned int i;numNegatives = XXX; for (i = 0; i < userValues.size(); ++i) {if (userValues.at(i) < 0) {numNegatives = numNegatives + 1;}} No initialization needed 0 -1 userVals.at(0)
0
What is the output? int n;for (n = 0; n < 10; n = n + 3) {cout << n << " ";} 0 1 2 3 4 5 6 7 8 9 1 4 7 10 0 3 6 9 0 3 6 9 12
0 3 6 9
Given the following function. To change the function to return the product instead of the sum, how many lines of code need to be changed? int Calculate(int a, int b) {return a + b;}int main() {cout << Calculate(3, 4);cout << Calculate(5, 2);cout << Calculate(6, 7);return 0;} 1 2 3 4
1
How many times does the while loop execute for the given input values of -1 4 0 9? userNum = 3;while (userNum > 0) {// Do something// Get userNum from input} 0 1 2 3
1
How many elements does the vector declaration create? vector<int> scores(10); // Vector declarationscores.at(0) = 25;scores.at(1) = 22;scores.at(2) = 18;scores.at(3) = 28; 0 4 9 10
10
What is the ending value of sum, if the input is 2 5 7 3? All variables are ints. cin >> x;sum = 0;for (i = 0; i < x; ++i) {cin >> currValue;sum += currValue;} 5 10 12 15
12
What is the output? int Calc(int num1, int num2) {return 1 + num1 + num2;}int main() {int x;x = Calc(4, 5); cout << Calc(x, 5);return 0;} 5 10 16 Error: Cannot have a function call in a cout statement
16
What is the output? int x = 18;while (x > 0) {// Output x and a spacex = x / 3; } 6 2 6 2 0 18 6 2 18 6 2 0
18 6 2
For the given program, how many cout statements will execute? void PrintShippingCharge(double itemWeight) {if ((itemWeight > 0.0) && (itemWeight <= 10.0)) { cout << (itemWeight * 0.75) << endl;}else if ((itemWeight > 10.0) && (itemWeight <= 15.0)) {cout << (itemWeight * 0.85) << endl;}else if ((itemWeight > 15.0) && (itemWeight <= 20.0)) {cout << (itemWeight * 0.95)<< endl;}}int main() {PrintShippingCharge(18);PrintShippingCharge(6);PrintShippingCharge(25);return 0;} 1 2 3 9
2
How many times will the loop iterate, if the input is 105 107 99 103? cin >> x;while (x > 100) {// Do somethingcin >> x;} 1 2 3 4
2
What is the output, if the input is 3 2 4 5? All variables are ints. cin >> num;for (i = 0; i < num; ++i) {cin >> curr;cout << curr;} 24 245 324 3245
245
How many function calls exist in the following code? int Calc1 (int a, int b) {return a + b / 2;}int Calc2 (int a, int b) {return a * b / 100;}int main () {int x;int y;x = Calc1 (5,3);cout << x;y = Calc2 (5,3);cout << y;cout <<Calc2 (5,3);} 2 3 4 5
3
Given myVector initially has 5 elements with values 3, 4, 6, 8, and 9. What are the values in myVector after the following? myVector.resize(2); 3 3, 4 3, 4, 6 3, 4, 6, 8, 9, 0, 0
3, 4
Given integer vector itemNumbers has three elements with values 33, 34, 35. What are the values in itemNumbers after the following? itemNumbers.push_back(32); 32, 34, 35 33, 34, 32 32, 33, 34, 35 33, 34, 35, 32
33, 34, 35, 32
What is the output if count is 4? for (i = count; i > 0; --i) {// Output count} 4 321 4321 43210
4321
What are the ending values in itemCount? vector<int> itemCount;itemCount.push_back(6);itemCount.push_back(7);itemCount.push_back(8);itemCount.pop_back(); 6, 7 6, 7, 8 7, 8 6, 7, 0
6, 7
What is output? double MyFct(double a, double b) {return (a + b) / 2.0;}int main() {double x = 3.0;double y = 5.0;double z = 8.0;double t;t = MyFct(x, y);t = MyFct(t, z);cout << t << endl;return 0;} 4.0 6.0 8.0 16.0
6.0
Which XXX calls GetUserScore() to get the user's name and score and store those values in the userName and userScore variables? void GetUserScore(string& userName, int& userScore) {cout << "Enter your name: " << endl;cin >> userName;cout << "Enter your score: " << endl;cin >> userScore;}int main() {string userName;int userScore;XXX;cout << userName << ", " << userScore << endl;return 0;} GetUserScore(string& userName, int& userScore); GetUserScore(string userName, int userScore); GetUserScore(userName, userScore); GetUserScore(&userName, &userScore);
GetUserScore(userName, userScore);
Which XXX / YYY declare a vector having MAX_SIZE elements and initializes all elements with -1? const int MAX_SIZE = 4;vecotr<int> myNumbers(XXX);int i;for (i = 0; i < YYY; ++i) {myNumbers.at(i) = -1;} MAX_SIZE / MAX_SIZE MAX_SIZE / MAX_SIZE - 1 MAX_SIZE - 1 / MAX_SIZE MAX_SIZE - 1 / MAX_SIZE - 1
MAX_SIZE / MAX_SIZE
What is the output? void WaterTemperatureForCoffee(int temp) {if (temp < 195) {cout << "Too cold.";}else if ((temp >= 195) && (temp <= 205)) {cout << "Perfect temperature.";}else if (temp > 205) {cout << "Too hot."; }}int main() {WaterTemperatureForCoffee(205);WaterTemperatureForCoffee(190);return 0;} Too cold. Perfect temperature. Perfect temperature.Too cold. Perfect temperature.Too cold.
Perfect temperature.Too cold.
Which XXX causes the program to output the message "Hello!"? void PrintMessage() {cout << "Hello!";}int main() {XXX;return 0;} cout << PrintMessage() PrintMessage() void PrintMessage() PrintMessage("Hello!")
PrintMessage()
The following program generates an error. Why? void PrintSum(int num1, int num2) {cout << num1 + num2;}int main() {int y;y = PrintSum(4, 5); return 0;} The void function is missing a "return;" statement. The values 4 and 5 cannot be passed directly to PrintSum() main() has a return statement that returns the value 0 PrintSum() has void return type, so cannot be assigned to a variable
PrintSum() has void return type, so cannot be assigned to a variable
Which corrects the logic error in the following program? void FindPrevNext (int x, int prev, int next) {prev = x - 1;next = x + 1;}int main () {int x = 10; int y; int z;FindPrevNext (x, y, z);cout << "Previous = " << y << ", Next = " << z;return 0;} The variables prev and next should be passed by reference The variables y and z should be initialized to 0 The function FindPrevNext() should have a return statement for variables prev and next prev and next should be initialized in FindPrevNext()
The variables prev and next should be passed by reference
Given an integer vector of size NUM_ELEMENTS, which XXX, YYY, and ZZZ will count the number of times the value 4 is in the vector? Choices are in the form XXX / YYY / ZZZ. vector<int> myVect(NUM_ELEMENTS);int cntFours;XXXfor (i = 0; YYY; ++i) {if (myVals.at(i) == 4) {ZZZ;}} cntFours = myVect.at(0); / i > myVect.size(); / cntFours = myVect.at(i); cntFours = myVect.at(1); / i < myVect.size(); / cntFours = myVect.at(i) + 1; cntFours = 1; / i > NUM_ELEMENTS; / cntFours = cntFours + 1; cntFours = 0; / i < NUM_ELEMENTS; / ++cntFours;
cntFours = 0; / i < NUM_ELEMENTS; / ++cntFours;
Given two integer vectors origList = {2, 3, 4, 5} and offsetList = {6, 7, 8, 9}, which statement prints out the sum of the second element in the origList with the corresponding element in the offsetList? cout << origList + offsetList << endl; cout << origList.at(2) + offsetList.at(2) << endl; cout << origList.at(1) + offsetList.at(1) << endl; cout << origList.at(2) + offsetList.at(2) << endl;
cout << origList.at(1) + offsetList.at(1) << endl;
Which for loop will iterate 100 times? for (i = 0; i < 99; i++) for (i = 1; i < 99; i++) for (i = 0; i < 100; i++) for (i = 1; i < 100; i++)
for (i = 0; i < 100; i++)
Which XXX outputs all the elements of vector myVals? for (i = 0; XXX; ++i) {cout << myVals.at(i) << " ";} i < myVals.size; i <= myVals.size(); i < myVals.size(); No such expression as the number of elements is unknown.
i < myVals.size();
The program should output even values between -10 and 10 (inclusive), so -10 -8 ... 8 10. What should XXX be? for (XXX) {cout << i << " ";} i = -10; i < 10; i = i + 2 i = -10; i <= 10; i = i + 2 i = -10; (i * 2) < 10; ++i i = -10; (i * 2) <= 10, ++i
i = -10; i <= 10; i = i + 2
Which XXX causes every character in string inputWord to be output? for (XXX) {cout << inputWord.at(i) << endl; } i = 0; i < (inputWord.size() - 1); ++i i = 0; i < inputWord.size(); ++i i = 0; i < (inputWord.size() + 1); ++i i = 0; i <= inputWord.size(); ++i
i = 0; i < inputWord.size(); ++i
A loop should output 1 to n. If n is 5, the output is 12345. What should XXX and YYY be? Choices are in the form XXX / YYY. cin >> n;for (XXX; i++) {cout << YYY;} i = 0; i < n / i i = 0; i < n / i + 1 i = 1; i < n / i i = 1; i < n / i + 1
i = 0; i < n / i + 1
Which YYY outputs the string in reverse? Ex: If the input is "Oh my", the output is "ym hO". int i;string str;getline(cin, str);for (YYY) {cout << str.at(i);} i = str.length(); i < 0; --i i = str.length(); i > 0; --i) i = str.length() - 1; i >= 0; --i) i = str.length() + 1; i > 0; --i)
i = str.length() - 1; i >= 0; --i)
Which is a valid definition for a function that passes two integers (a, b) as arguments, and returns an integer? myFunction(int a, int b) int myFunction(a, b) void myFunction (a, b) int myFunction(int a, int b)
int myFunction(int a, int b)
For the following function, which is a valid function call? Assume maxValue is an integer. int Max(int x, int y) {if (x > y){return x;}else {return y;}} maxValue = Max(15 25); maxValue = Max(); maxValue = Max(15, Max(35, 25)); Max = maxValue(15, 25);
maxValue = Max(15, Max(35, 25));
Which best describes what is output? Assume v is a large vector of ints. int i;int s;s = v.at(0);for (i = 0; i < v.size(); ++i) {if (s > v.at(i)) {s = v.at(i);}}cout << s; first value in v max value in v min value in v last value in v
min value in v
Which XXX and YYY correctly output the smallest value? Vector userVals contains integers (which may be positive or negative). Choices are in the form XXX / YYY. // Determine smallest (min) valueint minVal;XXX for (i = 0; i < userVals.size(); ++i) {if (YYY) {minVal = userVals.at(i);}}cout << "Min: " << minVal << endl; minVal = 0; / userVal > minVal minVal = 0; / userVal < minVal minVal = userVals.at(0); / userVals.at(i) > minVal minVal = userVals.at(0); / userVals.at(i) < minVal
minVal = userVals.at(0); / userVals.at(i) < minVal
Which assigns the vector's first element with 99? vector<int> myVector(4); myVector.at() = 99; myVector.at(-1) = 99; myVector.at(0) = 99; myVector.at(1) = 99;
myVector.at(0) = 99;
Which assigns the vector's last element with 99? vector<int> myVector(15); myVector.at(0) = 99; myVector.at(14) = 99; myVector.at(15) = 99; myVector.at(16) = 99;
myVector.at(14) = 99;
Which is an invalid access for the vector? vector<int> numsList(5);int x = 3; numsList.at(x-3) numsList.at(0) numsList.at(x+2) numsList.at((2*x) - x)
numsList.at(x+2)
What is the output? void Swap(int& x, int y) {int tmp;tmp = x;x = y;y = tmp;} int main() {int p = 4, q = 3;Swap(p, q);cout << "p = " << p << ", q = " << q << endl;} p = 3, q = 3 p = 4, q = 3 p = 3, q = 4 Error: Argument names must match parameter names
p = 3, q = 3
Given two vectors, studentNames that maintains a list of students, and studentScores that has a list of the scores for each student, which XXX and YYY prints out only the student names whose score is above 80? Choices are in the form XXX/ YYY. vector<string> studentNames(NUM_STUDENTS);vector<int> studentScores(NUM_STUDENTS); unsigned int i; for (i = 0; i < studentScores.size(); ++i) {if (XXX > 80) {cout << YYY << " ";}} studentNames.at(i) / studentNames.at(i) studentNames.at(i) / studentScores.at(i) studentScores.at(i) / studentNames.at(i) studentScores.at(i) / studentScores.at(i)
studentScores.at(i) / studentNames.at(i)
A loop should sum all inputs, stopping when the input is 0. If the input is 2 4 6 0, sum should end with 12. What should XXX, YYY, and ZZZ be? Choices are in the form XXX / YYY / ZZZ. int sum;int currVal;XXX;cin >> currVal;while (YYY) {ZZZ;cin >> currVal;} sum = 0 / currVal != 0 / sum = sum + currVal sum = currVal / currVal == 0 / sum = currVal sum = 1 / currVal != 0 / sum = sum + 1 cin >> sum / currVal == 0 / cin >> sum
sum = 0 / currVal != 0 / sum = sum + currVal
Which assigns the last vector element with 20? vector<int> userNum(N_SIZE); userNum.at(20); userNum.at() = 20; userNum.at(N_SIZE) = 20; userNum.at(N_SIZE - 1) = 20;
userNum.at(N_SIZE - 1) = 20;
Which declares two related integer vectors named personName and personAge each with 50 elements? vector<int> personName, personAge; vector<int> personName, personAge = 50; vector<int> personName = 50;vector<int> personAge = 50; vector<int> personName(50);vector<int> personAge(50);
vector<int> personName(50);vector<int> personAge(50);
Which XXX and YYY will loop as long as the input is an integer less than 100? Choices are in the form XXX / YYY. cin >> w;while (XXX) {// Do somethingYYY;} w < 100 / cin >> w w >= 100 / (nothing) w < 100 / (nothing) w >= 100 / cin >> w
w < 100 / cin >> w
What is the output? int columns;int rows;for (rows = 0; rows < 2; ++rows) { for (columns = 0; columns < 3; ++columns) {cout << "x";}cout << endl;} xxx xxx xx xx xx xxxxxx xxxxxx
xxxxxx
Which XXX is valid for the following code? int CalcSum(int a, int b) {return a + b;}int main() {int y;XXXreturn 0;} y = CalcSum(); y = CalcSum(4, 5); y = CalcSum(4 + 5); CalcSum(y, 4, 5);
y = CalcSum(4, 5);
