scanf - turbo c/c++

Code:

#include <conio.h>
#include <stdio.h>

main()
{
int a;
printf ("Enter Number ");
scanf ("%d",&a);
printf ("Num is %d",a);
getch();
return 0;
}

my problem is that my prof want me to disable inputing of dot (".") when I input data in scanf, somebody know how to do it?
i think of having if statements if (a=='.') b=8;printf ("%c",b);
where i want to set decimal 8 to ascii which is backspace; but it only execute when i enter during the scan,,

 

Use fgets to read a line of input from the user (use stdin as the file pointer). Then you can parse the input to your heart's content.