decimal to binary

#include
#include
int main()
{int rem,num,b=0,rev=0,rm;
printf("Enter the decimal number:= ");
scanf("%d",&num);
for(;num!=0; )
{rem=num%2;
b=b*10+rem;
num=num/2;
}

for(;b!=0; )
{
rm=b%10;
rev= rev*10 + rm;
b=b/10;
}

printf("binary is %d",rev);

getch();
return 0;
}