Hangman

I've been working on a Hangman program lately and I've ran into a problem: every time the program runs, the word never randomizes, and there are always 5 underscores. Could someone please help?

Any help is appreciated, thanks.
(sorry for the messy code)

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// Hangman.cpp

#include "stdafx.h"
#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>
#include <cstdio>


using namespace std;

char guess;
int wordnum;
int thesize;
string theword;
void DisplayUnderscores (int size);
void ScanForLetter (string word,char letter,int size);


void Intro ()
{
	cout << " .............................................................................." << endl;
	cout << " ....##.....##....###....##....##..######......##.....##....###....##....##...." << endl;
	cout << " ....##.....##...##.##...###...##.##....##.....###...###...##.##...###...##...." << endl;
	cout << " ....##.....##..##...##..####..##.##...........####.####..##...##..####..##...." << endl;
	cout << " ....#########.##.....##.##.##.##.##...####....##.###.##.##.....##.##.##.##...." << endl;
	cout << " ....##.....##.#########.##..####.##....##.....##.....##.#########.##..####...." << endl;
	cout << " ....##.....##.##.....##.##...###.##....##.....##.....##.##.....##.##...###...." << endl;
	cout << " ....##.....##.##.....##.##....##..######......##.....##.##.....##.##....##...." << endl;
	cout << " .............................................................................." << endl << endl;

	cout << "\t   _____               " << endl;
	cout << "\t  | /   |              " << endl;
	cout << "\t  |/                   " << endl;
	cout << "\t  |                    " << endl;
	cout << "\t  |                   " << endl;
	cout << "\t  |                    " << endl;
	cout << "\t__|________            " << endl;
}


void Intro1 ()
{
	cout << " .............................................................................." << endl;
	cout << " ....##.....##....###....##....##..######......##.....##....###....##....##...." << endl;
	cout << " ....##.....##...##.##...###...##.##....##.....###...###...##.##...###...##...." << endl;
	cout << " ....##.....##..##...##..####..##.##...........####.####..##...##..####..##...." << endl;
	cout << " ....#########.##.....##.##.##.##.##...####....##.###.##.##.....##.##.##.##...." << endl;
	cout << " ....##.....##.#########.##..####.##....##.....##.....##.#########.##..####...." << endl;
	cout << " ....##.....##.##.....##.##...###.##....##.....##.....##.##.....##.##...###...." << endl;
	cout << " ....##.....##.##.....##.##....##..######......##.....##.##.....##.##....##...." << endl;
	cout << " .............................................................................." << endl << endl;

	cout << "\t   _____               " << endl;
	cout << "\t  | /   |              " << endl;
	cout << "\t  |/    O               " << endl;
	cout << "\t  |                    " << endl;
	cout << "\t  |                   " << endl;
	cout << "\t  |                    " << endl;
	cout << "\t__|________            " << endl;
}


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


	wordnum = rand() % 10 + 1;

	switch (wordnum)
	{
		case 1:
			theword = "rhythm";
		case 2:
			theword = "lynx";
		case 3:
			theword = "photosynthesis";
		case 4:
			theword = "uncopyrightable";
		case 5:
			theword = "hospitalisation";
		case 6:
			theword = "fly";
		case 7:
			theword = "sky";
		case 8:
			theword = "sync";
		case 9:
			theword = "onomatopoeia";
		case 10:
			theword = "satyr";
	}

	thesize = theword.length();

	Intro();

	DisplayUnderscores(thesize);

	cout << endl << endl << "\tGuess a letter: ";
	cin >> guess;

	ScanForLetter(theword , guess , thesize);


	system ("PAUSE");
	return 0;
}

void DisplayUnderscores (int size)
{

	char *Array = new char[size];

	Array[size];

	for (int p = 0; p<size; p++)
	{
		Array[p] = '_';
	}	

	cout << endl << "\t" << "   ";

	for (int p = 0; p<size; p++)
	{
		cout << Array[p] << " ";
	}

}

void ScanForLetter (string word,char letter,int size)
{

	//int size = word.length();

	for (int i = 0 ; i < size ; i++)
	{

		//IF LETTER IS CORRECT #####################################################################################
		if (word[i] == letter)
		{

		}

		//if letter is INCORRECT #####################################################################################
		if(word[i] != letter)
		{

		}
	}

}



Output everytime:


 ..............................................................................
 ....##.....##....###....##....##..######......##.....##....###....##....##....
 ....##.....##...##.##...###...##.##....##.....###...###...##.##...###...##....
 ....##.....##..##...##..####..##.##...........####.####..##...##..####..##....
 ....#########.##.....##.##.##.##.##...####....##.###.##.##.....##.##.##.##....
 ....##.....##.#########.##..####.##....##.....##.....##.#########.##..####....
 ....##.....##.##.....##.##...###.##....##.....##.....##.##.....##.##...###....
 ....##.....##.##.....##.##....##..######......##.....##.##.....##.##....##....
 ..............................................................................

           _____
          | /   |
          |/
          |
          |
          |
        __|________

           _ _ _ _ _

        Guess a letter:




@Macrowav3

Try putting a break; after each theword = "...", otherwise, the checking keeps dropping down, and theword changes with it, till it gets to the last word, and that is the one it stops at.
Thanks! Its working perfectly now!
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