Binary and Gray Code Interchange

V can convert ny Binary Number in2 its Gray Code @ nytime.V dn't need 2 start 4m 0. Da algo is:

Binary to Gray Code
• Start 4m MSB (Left side of the Number)
• g(MSB)=b(MSB)
• g(ith bit)=b(ith bit) XOR b(i+1 th bit)

As an Example:

Binary= 1 0 0 0 1 1 0
        |\|\|\|\|\|\|
Gray  = 1 1 0 0 1 0 1

Gray Code to Binary
• Start from MSB
• b(MSB)=g(MSB)
• b(ith bit)=g(ith bit) if the number of 1's preceding g(ith bit) is Even
  else b(ith bit)=NOT of g(ith bit)

As an Example:

Gray	1	1	0	0	1	0	1
Binary	1	0	0	0	1	1	0
Comments	MSB	Prec 1 is odd	Prec 1 is Even	Prec 1 is Even	Prec 1 is Even	Prec 1 is odd	Prec 1 is Odd

Here is a Conversion Program::

// Header Files Inclusion 
#include<stdio.h>
#include<conio.h>
#include<string.h>

// User defined Functions Prototype List
void printcenter(char *s,int c);       // Function to print text in Center of Screen
void printtabbed(char *s,int t,int c); // Function to print text with preceding space from the left
void bintogray(char *t, char *f);      // Function to Convert Binary Number into Gray Code
void graytobin(char *t, char *f);      // Function to Convert Graycoded Number into Binary
void getinput(char *t);                // Function to take input in formatted way

// Main Function definition
void main()
{
 char f[65], t[65];
 char ch;
 int i;
textmode(C80);
textbackground(3);
_setcursortype(_NOCURSOR);
 do{
 clrscr();
 textbackground(RED);
 printcenter("\nBINARY and GRAY Code Interchanger", BROWN);
 textbackground(3);
 printcenter("\n-=Copy Righted by Arindam Roy=-",DARKGRAY);
 printcenter("\nThis can process 64 bit numbers", YELLOW);
 printtabbed("\n1. Binary -> Gray", 3, LIGHTBLUE);
 printtabbed("\n2. Gray -> Binary", 3, LIGHTBLUE);
 printtabbed("\n3. Exit", 3, LIGHTBLUE);
 printcenter("\n<Enter Your Choice>", LIGHTGREEN+BLINK);
 do
 ch=getch();
 while(ch<'1'||ch>'3');
 if(ch=='1') printcenter("\nBinary -> Gray", LIGHTMAGENTA);
 if(ch=='2') printcenter("\nGray -> Binary", LIGHTMAGENTA);
 if(ch=='3')
  break;
 do{
 printcenter("\n<Enter The Number>", LIGHTGREEN+BLINK);
 printcenter("\n", BLACK);
 getinput(t);
 i=strlen(t)-1;
 for(; i>=0;i--)
  if(t[i]!='0' && t[i]!='1')
   {
    i=66;
    break;
   }
 if(i==66)
 printcenter("\n:::Invalid Entry. Reenter the Number:::", RED);
 }while(i==66);

 if(ch=='1')
  bintogray(t,f);
 if(ch=='2')
  graytobin(t,f);
 printcenter("\n The Output \n", MAGENTA+BLINK);
 printcenter(f, BLACK);
 printcenter("\n\n Do you want to Process another Number? (y/n)", RED);
 do ch=getch(); while(toupper(ch)!='Y' && toupper(ch)!='N');
}while (toupper(ch)=='Y');

_setcursortype(_NORMALCURSOR);
textcolor(7);
textbackground(0);
clrscr();
}


// User defined Funcions' Definitions 

void printcenter(char *s, int c)
{
 int l;
 l=strlen(s);
 l=(80-l)/2;
 gotoxy(l,wherey());
 textcolor(c);
 cprintf("%s",s);
 textcolor(BLACK);
}


void printtabbed(char *s, int t, int c)
{
 gotoxy(8*t, wherey());
 textcolor(c);
 cprintf("%s",s);
 textcolor(BLACK);
}

void bintogray(char *t, char *f)
{
 int i,l;
 l=strlen(t);
 f[0]=t[0];
 for(i=1;i<l;i++)
 {
  if(t[i]==t[i-1])
   f[i]='0';
  else
   f[i]='1';
 }
 f[i]='\0';
}

void graytobin(char *t, char *f)
{
 int one=0,i;
 f[0]=t[0];
 if(f[0]=='1') one=1;
 for(i=1; t[i]; i++)
  {
   if(!(one%2)) f[i]=t[i];
   else f[i]=('1'-t[i])+48;
   if(t[i]=='1') one++;
  }
 f[i]='\0';
}

void getinput(char *t)
{
 int i=0;
 do{
 t[i]=getch();
 if(t[i]=='\r'&& i) break;
 t[i+1]='\0';
 printcenter(t,BLACK);
 i++;
 }while(i<65);
 t[i]='\0';
}