Homework Answers

This is similar to the exercise we did in class but with two changes: (1) Use doubles instead of ints; (2) The user will be providing the numbers. Just like the class exercise, output the sum, average, highest, and lowest of the user's numbers. 

Output:

This program will ask you to enter 5 numbers with decimal places.

It will then show you the total, average, largest number, and smallest number.

Enter a number:   [user types: 5.2]

Enter a number:   [user types: 9.8]

Enter a number:   [user types: 2.5]

Enter a number:   [user types: 17.5]

Enter a number:   [user types: 7.5]

Total: 42.5

Average: 8.5

Lowest: 2.5

Highest: 17.5

Let's start with an easy one. Create an array that stores 4 integers. Ask the user to enter any 4 numbers, one by one. Finally, output those numbers separated by three spaces.

Output:

This program will ask you to enter 4 numbers. It will then confirm your entries.

Enter a number:  [user types: 1]

Enter a number:  [user types: 2]

Enter a number:  [user types: 3]

Enter a number:  [user types: 4]

Your numbers: 1  2  3  4

All values in an array must be of the same data type.

A: True.

B: False.

The C++ compiler will return an error message if you use an array subscript that is beyond the boundaries of the array.

A: True.

B: False.

a=12x

Observe the following code:

const int SIZE = 3;

int nums[SIZE] = {1, 2, 3};

for (int i = 0; i <= SIZE; i++) { 

  std::cout << nums[i];

}

What is wrong with this code?

A: You cannot use constants with array definitions.

B: The initialization list exceeds the size of the array.

C: Should be i = 1 because you need to start with the first array element.

D: Should be I < SIZE so that you don't access an array element that doesn't exist.

Observe the following code:

int nums[3] = {1, 2, 3};

std::cout << nums;

What will be output to the screen?

A: 1.

B: 3.

C: 123.

D: A memory address.

Observe the following code:

std::cout << grades[1];

Which grade will be output to the screen?

A: The first grade.

B: The second grade.

C: All grades in the array.

D: Invalid code / Error.

Observe the following code:

int grades[5] = {0};

std::cout << grades[1];

What is the [1] part?

A: The Initialization List.

B: A Subscript.

C: The Size Declarator.

D: A Value.

Observe the following code:

int grades[5] = {0};

std::cout << grades[1];

What is the {0} part?

A: The Initialization List.

B: A Subscript.

C: The Size Declarator.

D: None of the above.