Quiz 8: Arrays&Vector

Declare a string array "score" that has 57 elements.

(a)  

Given the following For loop, what is the appropriate declaration for the integer array "matrix"?

for (n = 0; n <= 81; n++)

cout << matrix[n];

• int matrix[80];

• int matrix[82];

• int matrix[79];

• int matrix[81];

Given the following declarations, which of the following computes the sum of all the elements in "beta"?

int beta[24];

int sum= 0;

• for (index=1; index <= 24; index++)

  sum = sum+ beta[index];

• for (index=0; index < 24; index++)

  sum = sum+ beta[index];

• for (index=0; index < 24; index++)

  sum = sum+ beta;

• for (index=1; index <= 24; index++)

  sum = sum+ beta;

Given the following function prototype and the array declaration:

float ComputeSomething (short[], int );

short beta[39];

which of the following is the activation statement that calls the function "ComputeSomething" with the array "beta" and prints the returned value?

• cout << ComputeSomething(beta, 39);

• ComputeSomething(beta, 39);

• ComputeSomething(beta[39], 39);

• cout << ComputeSomething(beta[39], 39);

The following program code is the function definition of PrintArray which prints an array of double type with "sizeOfArray" elements.

void PrintArray( _________________________)

{

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

cout << i << gamma[i] << endl;

}

Which of the following is the correct choice for the blank?

• gamma[], sizeOfArray

• int gamma[], int sizeOfArray

• double gamma[], int sizeOfArray

• double gamma, int sizeOfArray

Declare an integer array "matrix" that is a two-dimensional array of 91 rows and 25 columns.

(a)  

Which of the following is the correct function prototype for a void function named DisplayThis that has three parameters where the first parameter is a two-dimensional array and the rest are integers?

• void DisplayThis ( double [5 ][10], int, int )

• void DisplayThis ( double [10][ ], int, int )

• void DisplayThis ( double [10], int, int );

• void DisplayThis ( double [ ][10], int, int );

Given the following function prototype and the array declaration:

float SumOfArr ( float anArray[ ][45], int rowSize, int colSize);

float arr[90][45];

which of the following is the activation statement that calls the function "SumOfArr" with the array "arr" and prints the returned value?

• cout << SumOfArr(arr, 90, 45);

• cout << SumOfArr(arr[90][45]);

• SumOfArr(arr[ ][45], 90, 45);

• cout << SumOfArr(arr[90][45], 90, 45);

Which of the following C++ statements adds a new element to the end of the vector Scores?

• cores.push(score);

• Scores.push_back(score);

• Scores.at(score);

• Scores.begin(score);

Given the following vector in C++, how would you access the seventh element within the vector:

vector <int> ages;

• cout << ages[7] << endl;

• cout << ages.begin(7) << endl;

• cout << ages.at(7) << endl;

• cout << ages.at(6) << endl;