Conversion Decimal Number into Binary Number and Vice Varsa

Desimal to banary number

 	#include<stdio.h>

#include<conio.h>

 	 	int  	main(){

 	 	long 	 	int  	num,r,p=10;

clrscr();

 	printf("Enter  	 any  number: ");

 	scanf("%ld",num);

printf("The binary equivalent is\n: ");

While(num !=0)

{

r=num%2;

gotoxy(p,4) ;

printf("%d",r);

num/=2;

p=p-1;

}

getch();

}

Output
 		
 		Enter any number any number: 15
 		Equivalent decimal value: 1111
 		 
 		Banary to Desimal number

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

#include<math.h>

 		 		int  		main(){

 		 		int  		num,r,p=0,sum=0;

clrscr();

 		printf("Enter  		any number : ");

 		scanf("%d",num);

While(num !=0)

{

r=num%10;

if(r!=0 && r!=1)

{

printf("not a binary number\n");

getch();

exit(0);

}

sum = sum+r*(int) pow(2,p);

num / = 10;

p++;

}

printf("The decimal number is %d\n : ",sum);

Getch();

}