how to check the scanf function if it will read more than one number

my code:
do
{
printf("please input the dividend and the divisor.\n");
if(!scanf("%d%d",&dend,&dor))
{
temp1=1;
fflush(stdin);
}
else
temp1=0;
}while(temp1==1);

it seems that it only depend on the first number it read.
if I input " a 32 ", it could know there is a error,
but if I input " 32 a ",
it accept that.

thanks in advance.

.