Help using a character as parameter

[chucker]

I have a multiple choice function below that is part of a larger program but I am having trouble having it operate with characters as inputs and arguments. It has to be a character input, but I kinda want it to act like an integer, how do i do that?

void addition(int *Preward) //function that is called by the users selection
{
 
 
    int random1, random2;
    int order;
    int one, two, three;
    int rando1, rando2;
    char a, b, c;                              // ERROR
    char userselect;                         //ERRRORR
    srand(time(NULL)); //generates fresh numbers each time.
    random1 = 1+(rand()%99); // from 1-99
    random2 = 1+(rand()%99); // from 1-99
    rando1 = 2+(rand()%198); // 2 to 198
    rando2 = 2+(rand()%198); // 2 to 198
    order = 1+(rand()%3);
 
 
    switch(order){
        case 1: printf("\n%d + %d = ", random1, random2);
            one = (random1+random2);
            two = (rando1);
            three = (rando2);
            printf("\n select from the following\n a) %d b) %d  c) %d\n", one, two, three);
            scanf("%c", &userselect);                        //ERROR
                if (userselect == a){                          //ERROR
                    printf("Congratulations\n\n");
                    *Preward = 1;
                }
                else{
                    printf("incorrect, correct answer is a\n\n");
                 }break;