Help in C regarding in filtering?

#include%26lt;stdio.h%26gt;





main()


{


int a=0, b=0, c, d, e;





clrscr();


for (c=1; c%26lt;=10; c++)


{


printf("%d + %d = ", c, c);


scanf("%d",%26amp;d);








e=c+c;








if (d==e)


{





printf("Right!\n");


a++;


}


else


{


printf("Sorry your answer is wrong. The answer is %d\n", e);


b++;


}


}





printf("\nThe total right answer(s) is %d", a);


printf("\nThe total wrong answer(s) is %d", b);


getch();


}





this program add numbers up to 10...


how can i add a filter that will end the program if i type an alphabet ???


tnx C masters!!!

Help in C regarding in filtering?
This question is an exact duplicate of the question below.