Can someone please help me. My code wont compile because it says 'letternum' is and undefined symbol and 'list' is as well even though I have them defined in a constant expression. This only started happening when I put in the switch statement. I'm very new to programming and any help would be greatly appreciated :D

here is my code:
//Hangman Assignment
// 19/11/12
#include<stdio.h>
#define letters 5

main()
{
char word[letters] = {'t','r', 'i', 'c', 'k'};
char guess_word[letters];
char letter;
int location;
int tries = 0;
int i = 0;
int search(const char list[], int letternum, char letter);
int startmenu, PlayGame, ExitGame;

printf("Lets PLay Hangman!");
printf("\n1. Play game\n0. Exit");
scanf("%d",&startmenu);

switch ( startmenu )// The user interface menu
{
case 1:
{
for( i = 0; i < letters; i++ )
guess_word[i] = '_';

do
{
printf("choose a letter: ");
scanf("%1s", &letter);

location = search(word, letters, letter);

if ( location != -1 )
{
printf("%c was found\n", letter);
guess_word[location] = letter;
for( i = 0; i < letters; i++ )
printf(" %c",guess_word[i]);
printf("\n");
}

else printf("%c was not found\n", letter);

++tries;
}

while(tries < 6);

return 0;
}

int search(const char list[], int letternum, char letter);
{
int i = 0, found = 0;


while (i < letternum && !found)
{
if (list[i] == letter) found = 1;

else i++;
}

if( found == 1 )
return i;
else
return -1;
}

case 0:
{
return 0;
} // End case 0



} // End switch

getchar();
}