quick syntax fix needed

There's something very wrong with this function...month and day aren't being changed, and I can't figure out why! Also, I'm trying to check for bad data (also wanted to check to see if its valid at all, but that didn't quite work).  I put into /* to isolate the other problem, but I would like this fixed too.void getdata(int *month, int *day)

        {


        printf("Please enter the month and day in the format mm/dd.");

        scanf("%d/%d", *month, *day);

        /* while(*month>12||*month<1||*day<1||*day>31)
                {
                printf("\nInput is incorrect. Please reenter:");
                scanf("%d/%d", *month, *day);
                } */
        }