Thread: PigLatin Program HELP!

This is what I have for my piglatin word translator program so far, there's an error C2059 in the Rule1 function where firstletter[1] and firstletter[2] are. Can someone help me with this? Also you don't have to do this but if you want it would be greatly appreciated if you looked at the entire program and gave me some tips PS its still a work in progress

Code:

// PigLatin Word Converter
// James Le
// COP2220 Summer 2012


#define _CRT_SECURE_NO_DEPRECATE
#include<stdio.h>
#include <math.h>
#include <string.h>






void Instructions (); // Function that defines instructions


void UserInput(); // Function that gets the input from the user and stores it somewhere


void terminate(); // Function to either continue or quit the program


int RuleChoice(char); // Function to determine which rule applies


int Rule1(char); // Function for Rule 1 for pig latin


int Rule2 (char); // Function for rule 2 for pig latin


int Rule3(char); // Function for rule 2 for pig latin


void Display(char); // Function to display final word onto screen


void AY( int /*don't know if i need an int for now*/ );




//char input_string [100];


//char*x = input_string;






int main()
{
	char input_string[100];
	char *str1, *str2;
	str1=input_string;


	/*FILE*PigLatin;
	PigLatin = fopen ("piglatin.txt", "a");*/


	Instructions();
	//printf("Enter a word:");
	printf("Enter a word: ");
	scanf("\n%s", input_string);
	
	if(RuleChoice(str1)==1)
	{
		Rule1(str1);
	}
	else if(RuleChoice(str1)==2)
	{
		Rule2(str1);
	}
	else
	{
		Rule3(str1);
	}


	//UserInput();
	//UserInput(); FUNCTION NEEDS WORK//
	
	
	


	getchar();
	return 0;
}


void Instructions()
{
	printf("Welcome to the PigLatin Converter\n");
	printf("You will enter a word\n");					// General Instructions to the program where it tells the user they will be entering a word to be converted to pig latin
	printf("The word will be converted to PigLatin\n");
	//UserInput();
	//Display();
	//terminate();
	
}


/*void UserInput() // return a pointer to an array to avoid ........
{
	FILE *PigLatin;
	
	PigLatin = fopen ("piglatin.txt", "w");


	//printf("Enter a word: ");
	//scanf("\n%s", input_string);
	//fprintf(PigLatin, "%s", input_string);
	
	RuleChoice();


	fclose(PigLatin);


	getchar();
}
*/


void Display(char *str1) // This function will display the new word that the program has converted into pig latin.
					// The function passes in a char and doesn't return anything, just prints the word
{
	printf("The word you enter is %s\n", *str1);
	//PigLatin=fopen("piglatin.txt", "w");
	//fprintf(PigLatin,"%s");
		//fprintf(PigLatin, "%s", input_string);


}




void terminate() // Function to Terminate Program
				// The function doesn't require a variable to pass into it
				// The program declares its own local variable choice and runs a while loop
{
	int choice;
	printf("\nTo quit program enter 0:\n");
	printf("\nTo continue program enter 1:\n");
	scanf("%d", &choice);


	while(choice == 1) // if the choice is '1', the function will return the user to the instructions where they will be prompted for another word
	{
		//void Instructions();
		Instructions();
	}
	
}




int RuleChoice( char *str1 ) // Function to determine which rule applies to word
						// If the function compares the first two rules and they don't apply it will automatically default to Rule 3.
{
	char Rule1[]={'H'}; //Still has to account for the QU
	char Rule1Q	[]="Qu";				// Checks the word to see if the second letter is an 'H' and .....


	char Rule2[]={'A', 'E', 'I', 'O', 'U'}; // Character array that checks if the word begins with a vowel




	if (str1[0]==Rule1[0] || (str1[0]==Rule1Q[0] && str1[1]==Rule1Q[1])) // If the second element of the array is an 'H' or the first two elements are a 'Qu' then rule 1 applies
	{
		printf("Rule 1");
		return 1;
	}
	
	else if (str1[0]==Rule2[0]||Rule2[1]||Rule2[2]||Rule2[3]||Rule2[4]) // If the first element of the input_string is a vowel then rule 2 applies
	{
		return 2;
	}


	else // If both fail, default to rule 3
	{
		return 3;
	}
}




int Rule1(char *str1) // Rule 1 Function
{
	char return_string[100];


	char erase[2] = {' ', ' '}; 


	char firstletter[3];// stores the first element of the input string to be used later
	
	firstletter[0] = str1[0];// stores the first element of the input string to be used later
	firstletter[1] = {'A'};
	firstletter[2] = {'Y'};
	
	strncpy(str1, erase,2); // eliminates the first two letters of the word and replaces with blanks of the erase array
	
	strcat(str1, firstletter); // concatenates the original first letter and 'AY' to the end of the word


	Display(str1); // displays new word onto screen
}


int Rule2(char *str1) // Rule 2 function
{
	
	//char AY[2]={'A','Y'};
	
		//if(input_string[0] == 'A' || input_string[0] == 'a' || input_string[0] == 'E' || input_string[0] == 'e' || input_string[0] == 'I' || input_string[0] == 'i' || input_string[0] == 'O' || input_string[0] == 'o' || input_string[0] == 'U' || input_string[0] == 'u') 
			
				strcat(str1, "AY"); // simply adds AY to the end of the word
				Display(str1); // Displays new word
				getchar();
			




	}




/*if(U_Input = Rule2Str1 || U_Input = Rule2Str1L)
{
	strcat(U_Input, 'AY');
}


else if //...........
{
}*/






int Rule3(char *str1) // Function for rule 3 of piglatin which accepts the input_string character array displays the new word
{
	char AY[2]={'A','Y'};
	char erase [2] = {' '};
	str1[(strlen(str1)+1)]==str1[0]; // takes first element of string and sets it equal to element that is one more than the length of the word
	
	strncpy(str1, erase, 2); //erases the first letter and puts a blank space in the element


	strcat(str1, AY); //adds AY to the end of the word


	Display(str1); // Displays new word in pig latin


	getchar();


}

ok wow I feel like an idiot :P