int main (void)
{
char buf[8];
to_octal(010644, buf, 6);
if (buf[1] != '1')
abort();
return 0;
}
void main()
{
char binary[100],octal[100];
int k;
printf("enter a binary number\n");
scanf("%s",binary);
k=valid(binary);
if(k==0)
{
printf("invalid input");
exit(0);
}
to_octal(binary,octal);
}
