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Program to display Binary equivalent of an input Hexadecimal Number

Program to display Binary equivalent of an input Hexadecimal Number
(Hexadecimal to Binary Converter)

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
void main()
{

 char z[5],c;
 int i=0;
 clrscr();
 printf("Enter a hexadecimal no.");
 printf("
Number will be accepted if you press Ctrl-Z & then ENTER after inputting no.");
 printf("
NUMBER:- " );
 while ((c=getchar())!=EOF)
 {
  printf(" ");
  if (c=='1')
   printf("0001");
  else if (c=='2')
   printf("0010");
  else if (c=='3')
   printf("0011");
  else if (c=='4')
   printf("0100");
  else if (c=='5')
   printf("0101");
  else if (c=='6')
   printf("0110");
  else if (c=='7')
   printf("0111");
  else if (c=='8')
   printf("1000");
  else if (c=='9')
   printf("1001");
  else if (c=='A'||c=='a')
   printf("1010");
  else if (c=='B'||c=='b')
   printf("1011");
  else if (c=='C'||c=='c')
   printf("1100");
  else if (c=='D'||c=='d')
   printf("1101");
  else if (c=='E'||c=='e')
   printf("1110");
  else if (c=='F'||c=='f')
   printf("1111");
  else
  { printf("ERROR");
	getch();
	exit(0); }
 }
 printf("
		 is its binary equivalent.");
 getch();
}