[Dev-C++] scanf with gets

[<and...@su...>]

Dear programmers,

I´m having to use the fflush command in the following code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
   char name[10];
   int a, b, c;

   printf("Enter a-->");
   scanf("%d", &a);
   printf("Enter some name-->");
   fflush(stdin);
   gets(name);
   printf("Enter com b-->");
   scanf("%d", &b);
   printf("The sum of %d with %d is %d\n", a, b, a+b);
   printf("And the name typed was %s\n", name);
   system("PAUSE");
   return 0;
}

The reason is that if I don´t put it, the program doesn´t wait for the name
to be typed via keyboard. It passes directly to the other operator, b,
indicating that the input buffer is loaded with something. I made some
experiments with short int (hd), but nothing solved.

1-Can anyone explain what is happening?
2-What is the solution for don´t use the fflush?

Regards
Andre