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


void DEXTOHEX(long int jem);
long int jem;
long int temp,temp2;
char choice;
main()
{
clrscr();
gotoxy(5,3);printf("================================================================");
gotoxy(5,4);printf("===                                                          ===");
gotoxy(5,5);printf("===   [A] convert decimal to binary and vice versa.          ===");
gotoxy(5,6);printf("===   [B] convert decimal to octal and vice versa.           ===");
gotoxy(5,7);printf("===   [C] convert decimal to hexadecimal and vice versa.     ===");
gotoxy(5,8);printf("===   [D] convert binary to octal and vice versa.            ===");
gotoxy(5,9);printf("===   [E] convert binary to hexadecimal and vice versa.      ===");
gotoxy(5,10);printf("===   [F] convert octal to hexadecimal and vice versa.       ===");
gotoxy(5,11);printf("===                                                          ===");
gotoxy(5,12);printf("===   Enter Choice [   ]                                     ===");
gotoxy(5,13);printf("================================================================");
gotoxy(26,12);choice=getche();
clrscr();


switch(choice)
{

			case 'A':
			case 'a':
			{
			clrscr();
			printf("Convert Decimal to Binary and vice versa");
			gotoxy(5,10);printf("Enter the Decimal Number:");
			gotoxy(30,10);scanf("%ld",&jem);
			break;
			}
			case 'B':
			case 'b':
			{
			clrscr();
			printf("Convert Decimal to Octal and Vice Versa");
			gotoxy(5,10);printf("Enter the Decimal Number:");
			gotoxy(30,10);scanf("%ld",&jem);
			break;
			}
			case 'C':
			case 'c':
			{
			clrscr();
			printf("Convert Decimal to Hexadecimal and Vice Versa");
			gotoxy(5,10);printf("Enter the Decimal Number:");
			gotoxy(30,10);scanf("%ld",&jem);
			DECTOHEX(jem);
			break;
			}

			default:
			{
			clrscr();
			printf("under construction");
			}
}
getch();
}
void DECTOHEX(long int jem)
{
long int bin = 0;
			int b,p=0;
			temp=jem;
			while (jem>0)
			{
			b=jem%16;
			jem=jem/16;
			bin=bin+b*pow(10,p++);
			}
			gotoxy(5,15);printf("The Hexadecimal  Equivalent of %ld is %c",temp,bin);
			
}