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C++

The program asks user to enter five single characters separated by spaces, and depending on the characters, it will generate a random number.

Here are the rules to follow exactly:
- If input character is 'a', program will generate a random number from 1 to 20.
- If input character is 'e', program will generate a random number from 21 to 40.
- If input character is 'i', program will generate a random number from 41 to 60.
- If input character is 'o', program will generate a random number from 61 to 80.
- If input character is 'u', program will generate a random number from 81 to 100.
- If input character is not one of the above characters, display a 0 in the output.

Here are some sample runs:

Run 1

This program plays a simple random number game.
Enter 5 vowel characters (a,e,i,o,u) separated by spaces: a e i o u
The random numbers are 10 25 46 69 99
---------------------------------------------------------------
Run 2

This program plays a simple random number game.
Enter 5 vowel characters (a,e,i,o,u) separated by spaces: a e a u o
The random numbers are 10 25 4 99 66
---------------------------------------------------------------
Run 3

This program plays a simple random number game.
Enter 5 vowel characters (a,e,i,o,u) separated by spaces: a z i e o
The random numbers are 10 0 43 29 76
---------------------------------------------------------------
Run 4

This program plays a simple random number game.
Enter 5 vowel characters (a,e,i,o,u) separated by spaces: a z i f o
The random numbers are 15 0 47 0 74

What I have tried:

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <ctime>

using namespace std;

/* Homework 3
Yong Yu Xuan
This program generates a random number depending on the
character inputted.
*/

int main()
{
    srand(time(0));

    //constant for setw()
    const int GAP = 6;

    //variables
    int num;

    int none = 0;
    char alphabet;
    char letter1, letter2, letter3, letter4, letter5;
    letter1 = 'a';
    letter2 = 'e';
    letter3 = 'i';
    letter4 = 'o';
    letter5 = 'u';

    //tell user to enter five characters at random
    cout << "This program plays a simple, random number game." << endl;
    cout << "Enter five vowel characters (a,e,i,o,u) in any order separated ";
    cout << "by spaces: ";
    cin >> alphabet >> alphabet >> alphabet >> alphabet >> alphabet;

    alphabet = num;

    cout << "The five random numbers are: " << setw(GAP) << num << setw(GAP);
    cout << setw(GAP) << num << setw(GAP) << num;
    cout << setw(GAP) << num << setw(GAP) << num;

    if (alphabet == letter1)
        cout << setw(GAP) << rand() % 19 + 1;

    else if (alphabet == letter2)
        cout << setw(GAP) << rand() % 19 + 21;

    else if (alphabet == letter3)
        cout << setw(GAP) << rand() % 19 + 41;

    else if (alphabet == letter4)
        cout << setw(GAP) << rand() % 19 + 61;

    else if (alphabet == letter5)
        cout << setw(GAP) << rand() % 19 + 81;

    else
        cout << none << endl;

    return 0;
}