Chapter 5

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Chapter 5

Arrays

This activity contains 10 questions.

Given the following array declaration, which snippet of code outputs all elements in the array?
int arr[5];

for (int i=1; i<5; i++) {
  cout << arr[i] << endl;
}

for (int i=0; i<5; i++) {
  cout << arr[i] << endl;
}

for (int i=0; i<=5; i++) {
  cout << arr[i] << endl;
}

for (int i=1; i<=5; i++) {
  cout << arr[i] << endl;
}

Which of the following correctly declares an array that holds exactly 10 integers?

int arr[11];int[11] arr;int[10] arr;int arr[10];

Given the following function prototype:


  void foo(int arr[]);

Which statement correctly passes the array to the function?

int arr[10];
foo(arr);

int arr[10];
foo(arr[]);

int arr[10];
foo(arr[10]);

int arr[10];
foo(arr[0]);

What will the following snippet of code output?


void foo(int arr[])
{
  arr[1]=1;
  return;
}

int main()
{
  int arr[] = {3, 2, 1};
  foo(arr);
  cout << arr[0] << " " << arr[1] << " " << arr[2];
  return 0;
}

1 2 13 1 13 2 11 2 3

Which of the following is considered the best way to output all values inside an array that is passed to a function?

void foo(int a[])
{
   for (int i=0; i<10; i++) {
     cout << a[i] << endl;
   }
}

void foo(int a[])
{
   for (int i=0; i<a.length; i++) {
     cout << a[i] << endl;
   }
}

void foo(int a[], int arrsize)
{
   for (int i=0; i<arrsize; i++) {
     cout << a[i] << endl;
   }
}

void foo(int a[])
{
   for (int i=0; i<SIZE; i++) {
     cout << a[i] << endl;
   }
}

What will the following snippet of code output?


void foo(const int arr[])
{
  arr[1]=1;
  return;
}

int main()
{
  int arr[] = {3, 2, 1};
  foo(arr);
  cout << arr[0] << " " << arr[1] << " " << arr[2];
  return 0;
}

3 1 1An error message.3 2 11 2 1

Which of the following is an invalid function prototype to accept a two-dimensional array of type double?

double foo(double arr[][]);double foo(double arr[10][100]);double foo(double arr[][10]);double foo(double arr[10][10]);

What will the following snippet of code output?


int a[5];
a[0]=1; a[1]=2; a[2]=3;
for (int i=0; i<5; i++) {
   cout << arr[i] << endl;
}

1
2
3
<unknown value>
<unknown value>

1
2
3
<blank>
<blank>

The program will output an error message.

What is the output of the following code?


int a[] = {1,2,3,4,5};
int i = 0, j = 4, temp;
while (i<=j) {
  temp = a[i];
  a[i] = a[j];
  a[j] = temp;
  i++;
  j--;
}
for (i=0; i<5; i++) {
   cout << a[i] << endl;
}

Which of the following functions will correctly "delete" the element in the array at position p by shifting each array element down one slot?

For example, given the following code:


int a[] = {1,2,3,4,5};
int numelements = 5;

deletenumber(a,2,numelements);
for (int i=0; i<numelements; i++) {
   cout << a[i] << endl;
}

The output should be:

1
2
4
5


To "delete" number 3 which is stored in position 2.

void deletenumber(int a[], int p, int &numelements)
{
  for (int i=p; i<numelements; i++) {
          a[i]=a[i+1];
  }
  numelements--;
}

void deletenumber(int a[], int p, int &numelements)
{
  for (int i=p; i<numelements-1; i++) {
          a[i]=a[i+1];
  }
  numelements--;
}

void deletenumber(int a[], int p, int &numelements)
{
  for (int i=p; i<numelements-1; i++) {
          a[i+1]=a[i];
  }
  numelements--;
}

void deletenumber(int a[], int p, int &numelements)
{
  for (int i=0; i<p; i++) {
          a[i]=a[i+1];
  }
  numelements--;
}

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Chapter 5

Given the following array declaration, which snippet of code outputs all elements in the array?
int arr[5];

Which of the following correctly declares an array that holds exactly 10 integers?

Given the following function prototype:
void foo(int arr[]);
Which statement correctly passes the array to the function?

What will the following snippet of code output?
void foo(int arr[]) { arr[1]=1; return; } int main() { int arr[] = {3, 2, 1}; foo(arr); cout << arr[0] << " " << arr[1] << " " << arr[2]; return 0; }

Which of the following is considered the best way to output all values inside an array that is passed to a function?

What will the following snippet of code output?
void foo(const int arr[]) { arr[1]=1; return; } int main() { int arr[] = {3, 2, 1}; foo(arr); cout << arr[0] << " " << arr[1] << " " << arr[2]; return 0; }

Which of the following is an invalid function prototype to accept a two-dimensional array of type double?

What will the following snippet of code output?
int a[5]; a[0]=1; a[1]=2; a[2]=3; for (int i=0; i<5; i++) { cout << arr[i] << endl; }

What is the output of the following code?
int a[] = {1,2,3,4,5}; int i = 0, j = 4, temp; while (i<=j) { temp = a[i]; a[i] = a[j]; a[j] = temp; i++; j--; } for (i=0; i<5; i++) { cout << a[i] << endl; }

Chapter 5

Given the following array declaration, which snippet of code outputs all elements in the array? int arr[5];

Which of the following correctly declares an array that holds exactly 10 integers?

Given the following function prototype: void foo(int arr[]); Which statement correctly passes the array to the function?

What will the following snippet of code output? void foo(int arr[]) { arr[1]=1; return; } int main() { int arr[] = {3, 2, 1}; foo(arr); cout << arr[0] << " " << arr[1] << " " << arr[2]; return 0; }

Which of the following is considered the best way to output all values inside an array that is passed to a function?

What will the following snippet of code output? void foo(const int arr[]) { arr[1]=1; return; } int main() { int arr[] = {3, 2, 1}; foo(arr); cout << arr[0] << " " << arr[1] << " " << arr[2]; return 0; }

Which of the following is an invalid function prototype to accept a two-dimensional array of type double?

What will the following snippet of code output? int a[5]; a[0]=1; a[1]=2; a[2]=3; for (int i=0; i<5; i++) { cout << arr[i] << endl; }

What is the output of the following code? int a[] = {1,2,3,4,5}; int i = 0, j = 4, temp; while (i<=j) { temp = a[i]; a[i] = a[j]; a[j] = temp; i++; j--; } for (i=0; i<5; i++) { cout << a[i] << endl; }

Given the following array declaration, which snippet of code outputs all elements in the array?
int arr[5];

Given the following function prototype:
void foo(int arr[]);
Which statement correctly passes the array to the function?

What will the following snippet of code output?
void foo(int arr[]) { arr[1]=1; return; } int main() { int arr[] = {3, 2, 1}; foo(arr); cout << arr[0] << " " << arr[1] << " " << arr[2]; return 0; }

What will the following snippet of code output?
void foo(const int arr[]) { arr[1]=1; return; } int main() { int arr[] = {3, 2, 1}; foo(arr); cout << arr[0] << " " << arr[1] << " " << arr[2]; return 0; }

What will the following snippet of code output?
int a[5]; a[0]=1; a[1]=2; a[2]=3; for (int i=0; i<5; i++) { cout << arr[i] << endl; }

What is the output of the following code?
int a[] = {1,2,3,4,5}; int i = 0, j = 4, temp; while (i<=j) { temp = a[i]; a[i] = a[j]; a[j] = temp; i++; j--; } for (i=0; i<5; i++) { cout << a[i] << endl; }