#include<stdio.h>
#include<stdlib.h>
#include<string.h>



/* ---- Reversing Function ---- */
void fReverse(char str[])
{
	int x = 0;
	char wordReversed;

	wordReversed = str[x];

	for(x = strlen(str); x >= 0; x--)
	{
		printf("%c", str[x]);
	}
}// ------------------------------



/* --------- First Occurance Function -------- */
void fOccur(char x, char str[])
{
	int p = (int)(strchr(str, x) - str);
	printf("\nPosition of first occurence: %d", (p+1));
}// --------------------------------------------



/* --------- Swap Function- -------- */
void fSwap(char str[], char y, char z)
{


}// -----------------------------------



/* ------- Greatest String Function ------ */
void fGreatest()
{

}// -----------------------------------------



/* ------------------- Main Function -------------------- */
int main(void)
{
	int zz;
	char strOne[20], strTwo[20], chOne, chTwo, chThree;
	char c1BUF[2], c2BUF[2], c3BUF[2];

	zz = 0;


	printf("+++++++++++++++++++++++++++++++++++++++++");
	printf("\n+                                       +");
	printf("\n+      ??????????? ???????????????      +");
	printf("\n+              ??? ???????              +");
	printf("\n+                                       +");
	printf("\n+++++++++++++++++++++++++++++++++++++++++");


	/* ---- Take word and reverse it ---- */
	do
	{
		printf("\n\nEnter a word: ");
		fgets(strOne, 20, stdin); 
		if(strOne[0] != '\n')
		{
			printf("\n    Reversed:");
			fReverse(strOne);
			zz = 0;
		}
		else
		{
			printf("\n     >Incorrect input, please try again.");
			zz = 1;
		}
	}while(zz == 1);
	/* ---------------------------------- */


    printf("\n\n-----------------------------------------\n");


	/* -------- Take char, check for first occurance -------- */
	do
	{
		printf("\nEnter a character from that word:");
		fgets(c1BUF, 2, stdin);
		chOne = c1BUF[0];
		if((chOne != '\n') /*&& ((c1BUF[1] == '\0') || (c1BUF[1] == '\n'))*/)
		{
			fOccur(chOne, strOne);
			zz = 0;
		}
		else
		{
			printf("\n     >Incorrect input, please try again.\n");
			zz = 1;
		}
	}while(zz == 1);
	/* ------------------------------------------------------ */


    printf("\n\n-----------------------------------------\n");
  

	/* ---- Take another char, change all instances in string ---- */
	do
	{
		printf("\nEnter a character in the string to be changed:");
		fgets(c2BUF, 2, stdin);
		chTwo = c2BUF[0];
		if((chTwo != '\n') && ((c2BUF[1] == '\0') || (c2BUF[1] == '\n')))
		{
			zz = 0;
		}
		else
		{
			printf("\n     >Incorrect input, please try again.\n");
			zz = 1;
		}
	}while(zz == 1);

	do
	{
		printf("\nEnter a character to change all instances to:");
		fgets(c3BUF, 2, stdin);
		chThree = c3BUF[0];
		if((chThree != '\n') && ((c3BUF[1] == '\0') || (c3BUF[1] == '\n')))
		{
			printf("\nNew word is:");
			fSwap(strOne, chTwo, chThree);
			zz = 0;
		}
		else
		{
			zz = 1;
		}
	}while(zz == 0);
	/* ----------------------------------------------------------- */


	printf("\n\n-----------------------------------------\n");


	/* ---- Take another string, print greatest ---- */
	printf("\nEnter another string: ");
	scanf("%s", &strTwo);
	printf("\n  Greatest string is:");
	fGreatest();
	/* --------------------------------------------- */


	
	printf("\n\n-----------------------------------------\n");


	return 0;
}// ------------------------------------------------------

	char wordReversed;

	wordReversed = str[x];

fflush(stdin);

/*
 *  This C implementation will clear the input buffer.
 *  The chances are that the buffer will already be empty,
 *  so the program will wait until you press [Enter].
 */

#include <stdio.h> 

int main(void)
{
  int   ch;
  char  buf[BUFSIZ];
  
  puts("Flushing input");
  
  while ((ch = getchar()) != '\n' && ch != EOF);
  
  printf ("Enter some text: ");
  
  if (fgets(buf, sizeof(buf), stdin))
  {
    printf ("You entered: %s", buf);
  }
  
  return 0;
}

/*
 * Program output:
 *
 Flushing input
 blah blah blah blah
 Enter some text: hello there
 You entered: hello there
 *
 */