Reversing a string in C

/** A bit of code which will ask you to enter a string and then it'll
 *  write it in reverse. MMXII Donkeysoft */
// Unfortunately, I used Visual Studio 2010, so you need to add the following
// in place of this, or in the StdFxa.cpp file:
// #include <stdio.h>
// #include <stdlib.h>
// #include <conio.h>
// #include <string.h>
#include "stdafx.h"
// Function prototypes:
void main (void);
void clear (void);
static void reverse (void);
// Global variables:
static int i=0;
static int count=0;
static char word[255];
static char reversed[255];
static int nChars;
static char key=' ';
void main(void)
{
     // Does a cheat for clearing the console:
     clear();
     printf("Enter a word or sentence to be reversed (max is 255 characters): ");
     scanf("%s", word);
     printf("\n");
     // Calls the function to reverse the string:
     reverse();
     i=0;
     // Writes each character while not null:
     while(word[i])
     {
          printf("%c",word[i]);
          i=i+1;
     }
     printf(" reversed is %s\n",reversed);
     printf("\nPress any key to exit.");
     // Sets key to zero:
     key=0;
     // Repeats until a key is pressed, or in other words, waits until a key is pressed:
     while(!key)
     {
          key=getchar();
     }
}
// Clear console function:
void clear(void)
{
     // 120 newlines:
     for(i=0;i<120;i=i+1)
     {
          printf("\n");
     }
}
// Reverse function:
void reverse(void)
{
     nChars=0;
     // Counts number of characters:
     while(word[nChars])
     {
          nChars=nChars+1;
     }
     printf("Word length is %d\n",nChars);
     // The last character is null, so we don't need that:
     nChars=nChars-1;
     // Writes the indexed string at reversed [0+i] to the indexed string word [char-i]
     for(i=0; i<=nChars+1; i=i+1)
     {
          reversed[i]=word[nChars-i];
     }
     // Adds a null value to say that this is the end of the string:
     reversed[i]='\0';
     // Should clear keyboard buffer:
     getchar();
}