McFarland School District - Set 4: Single Array

To complete this set of problems you must have gone through the following lessons:

All lessons for Problem Sets 1, 2 & 3
Arrays (single)

Problem 1

Using an integer array, write a program that allows the user to input 5 numbers. The computer should then print a list of the numbers in their original order and then in reverse order.

Output Example

Enter number 1: 23
Enter number 2: 3
Enter number 3: 96
Enter number 4: 28
Enter number 5: 10

Reverse order: 10 28 96 3 23
Original order: 23 3 96 28 10

Problem 2

Write a program that allows the user to enter 5 letters of the alphabet. The computer should then ask for the user to enter a letter to be checked to see if it is the original list.

Output Example

Enter a letter: A
Enter a letter: Y
Enter a letter: J
Enter a letter: K
Enter a letter: P

Enter a letter to check: K
K is in the original list

or...

Enter a letter: A
Enter a letter: Y
Enter a letter: J
Enter a letter: K
Enter a letter: P

Enter a letter to check: Z
Z is not in the original list

Problem 3

Using an integer array, write a program that allows the user to input 5 numbers. The user should then be asked to enter a number from 1 to 5 to see what input value is stored at that position.

Output Example

Enter a number: 45
Enter a number: 21
Enter a number: 9
Enter a number: 54
Enter a number: 76

Enter the position (0 to Quit): 2
The number 21 is stored in that position.
Enter the position (0 to Quit): 5
The number 76 is stored in that position.
Enter the position (0 to Quit): 0
Good-bye.

Problem 4

Using an integer array write a program that has the computer randomly generate 10 numbers from 1 to 100. The computer should display the list of numbers, the highest number and the lowest number.

Output Example

The numbers selected randomly are: 23 51 3 89 20 9 55 83 43 22
The highest number selected : 89
The lowest number selected: 3

Problem 5

Using an integer array write a program that has the computer randomly generate 20 numbers from 1 to 100. The user should input a number that will be used to see if any of the randomly selected numbers are multiples of that number.

Output Example

Numbers chosen: 34 21 3 61 52 55 80 42 11 19 37 82 56 37 88 91 21 23 52 78
Enter a number (0 to quit): 5
Multiples of 5: 55 80
Enter a number (0 to quit): 2
Multiples of 2: 34 52 80 42 82 56 88 52 78
Enter a number (0 to quit): 0
Good-bye.

Problem 6

Using a String array, write a program that allows the user to enter 10 words. Have the computer randomly choose four of the words and print them out as a nonsense sentence.

Output Example

Enter word 1: dog
Enter word 2: cat
... some output omitted to save space ...
Enter word 10: mouse

The nonsense sentence is: cat bird fish dog.

Problem 7

Write a program that randomly chooses 5 numbers from 1 to 10. Have the computer calculate the total of the numbers selected. The program should run 3 times to get three totals. The totals should be printed out in the reverse order that they were calculated. You will need to use two separate arrays, one with 15 elements (boxes) to store the chosen numbers, another with 3 elements to store the totals.

Output Example

The run 3 numbers are: 4 3 9 1 3 for a total of 20
The run 2 numbers are: 7 2 1 3 6 for a total of 19
The run 1 numbers are: 2 8 9 4 6 for a total of 29

Problem 8

Write a program that has the computer store in an array 10 randomly chosen numbers ranging from 1 to 100. The computer should then print a list of the even numbers followed by a list of the odd numbers.

Output Example

Even numbers: 4 88 62 46
Odd numbers: 57 97 11 73 15 3

Problem 9

Write a program that rolls a pair of dice 1000 times and prints the number of times each different point total was rolled. Only 1 counter is allowed. Hint: use an array such as roll[dieTotal ]++ to produce the output as shown below.

Output Example

Point Roll	Times Appeared
2	33
3	61
... some output omitted to save space ...
11	67
12	35

Problem 10

A program that analyzes a set of numbers can be very useful. Write a program that randomly chooses 50 numbers ranging from 1 to 50, and then performs the following functions on the numbers:

Determine and print the average number.
Determine and print the maximum number.
Determine and print the minimum number.
Determine and print the range (maximum number - minimum number).
Determine and print the median (the number that occurs most often).
Display a bar graph called a histogram showing the numbers in each five unit range (i.e., 1-5,6-10,11-15, etc.). The histogram should look similar to the following output.

Output Example

The average is 27.0
The highest number selected is 50
The lowest number selected is 2
The range is 48
The median is 5

1-5        *******
6-10      **
11-15   ****
16-20   ******
21-25   ****
26-30   **
31-35   *****
36-40   *******
41-45   *******
46-50   ******

Problem 11

Write a version of the game High-Low that lets the computer choose a random number from 1 to 100. The player has 10 chances to guess the computer's number. If the user guesses the same number more than once a "Wake Up!" message should be sent.

Output Example

Enter your guess (1-100): 54
54 is too high. Guess again.
Enter your guess (1-100): 24
24 is too low. Guess again.
Enter your guess (1-100): 54
Wake up! 54 is too high. Guess again.
Enter your guess (1-100): 37
37 is correct!

Problem 12

Write a program that begins randomly choosing numbers ranging from 1 to 50. Have the computer stop choosing numbers when that number is a repeat.

Output Example

47 33 28 92 25 46 28
28 was stored at position 3 and at position 7.

Problem 13

Write a program that randomly chooses 5 numbers ranging from 1 to 10. Have the computer produce a list of the numbers in the original order followed by a sorted list of the numbers from the lowest to the highest.

Output Example

The original order: 4 6 10 4 3
From low to high: 3 4 4 6 10

Problem 14

Write a program that randomly chooses 10 numbers ranging from 1 to 15. If a number is a repeat, it may not be used and must be replaced with a number that is not a repeat. The final list should be printed.

Output Example

The numbers selected are: 5 3 13 12 4 9 11 8 10 1

Problem 15

Modify the previous program so that the numbers are sorted from the highest to the lowest number selected.

Output Example

The numbers selected are: 14 13 10 9 8 6 4 3 2 1

Set 4: Single Array

McFarland High (9-12)