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Lab 01 - Working with integer arrays

🎯 Problems

  1. Looping until getting a valid number from the keyboard
  2. Returning multiple values from a function
  3. Generate randomly an integer
  4. Save all numbers into a dynamic array (vector)
  5. Using function pointer for reducing an array

Exercises

1. Working with integer arrays from the keyboard

Initial information

  • Name your project: IntegersFromKeyboard

Requirements

  • 1. Print out the instructions for the program: Working with integer arrays from the keyboard
  • 2. Enter an integer n in the range of [5, 10].
  • 3. Enter n integers, each integer in the range of [1, 100] and save them into a vector
  • 4. Find all odd numbers, all even numbers, all palindromic numbers, all prime numbers

Example output (happy path)

Working with integer arrays from the keyboard.

Please enter an integer in the range of [5, 10]: 6

Please enter 6 integer(s), each in the range of [1, 100]:
The [0] integer: 12
The [1] integer: 4
The [2] integer: 77
****The [3] integer: 26
The [4] integer: 33
The [5] integer: 99

You have entered 6 integer(s): 12, 4, 77, 26, 33, 99
Found 3 odd number(s): 77, 33, 99
Found 3 even number(s): 12, 4, 26
Found 4 palindromic number(s): 4, 77, 33, 99
Found 1 prime number(s): 4

Example output (unhappy path)

Working with integer arrays from the keyboard.

Please enter an integer in the range of [5, 10]: (Press enter)
**Error: Input string cannot be empty.**

Please enter an integer in the range of [5, 10]: allstring
**Error: Invalid input format.**

Please enter an integer in the range of [5, 10]: 20
**Error: The integer must be in the range of [5, 10]**

Please enter an integer in the range of [5, 10]: 6 
*.... (continue as the happy path above)*

Improvement - Enhanced output

Rather than

...
You have entered 6 integer(s): 12, 4, 77, 26, 33, 99
Found 3 odd number(s): 77, 33, 99
Found 3 even number(s): 12, 4, 26
Found 4 palindromic number(s): 4, 77, 33, 99
Found 1 prime number(s): 4

Can you generate this output instead?

...
You have entered **6 integers**: 12, 4, 77, 26, 33, 99
Found **3 odd numbers**: 77, 33, 99
Found **3 even numbers**: 12, 4, 26
Found **4 palindromic numbers**: 4, 77, 33, 99
Found **1 prime number**: 4

Hint: add a helper function to decide

2. Generating integers randomly

Initial information

  • Name your project: RandomlyGeneratedIntegers

Requirements

  • 1. Print out the instructions for the program: Working with randomly generated integers
  • 2. Generate randomly an integer n in the range of [5, 10].
  • 3. Generate randomly n integers, each integer in the range of [10, 100], and save them into a vector
  • 4. Find all odd numbers, all even numbers, all palindromic numbers, all square numbers

Example output (happy path)

**Working with randomly generated integers** 

Generating 6 integers: 12, 4, 77, 26, 33, 99
Found **3 odd numbers**: 77, 33, 99
Found **3 even numbers**: 12, 4, 26
Found **4 palindromic numbers**: 4, 77, 33, 99
Found **1 prime number**: 4