Thread: Help using a character as parameter

Originally Posted by TheBigH

The switch statement works just fine with char type, because a char is really just a small integer. You could do something like

Code:

switch( userselect ) {
   case a:
      /* hurrah!!!! */
      break;
   default:
      /* noooooooooooooo!!!! */
}

i need to keep the switch(order) as is so that the resst of the cases below are randomized. its supposed to be a random multiple choice switch. and the choices i really want to be letter select somehow

Originally Posted by laserlight

I think you should tell us what your program is actually supposed to do.

its a math game and you chose either addition or subtration then it gives u a random problem and keeps ur score. I m still trying to work on the multiple choice interface.

Code:

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










int menu();
void addition(int *Preward); // function to return truth values
void subtraction(int *Preward);


int main()
{
    int Finished = 0;
    int choice, score = 0;
    int reward = 0;


    while(Finished != 1) // while finished is not true
    {
        printf("\nscore: %d", score); // print the score
        {
            choice = menu(); // calls for user input and enters it to switch
            switch  (choice){ // accesses the functions
            case 0: Finished = 1;                     break;
            case 1: addition(&reward);                break;
            case 2: subtraction(&reward);             break;
            default : printf("Error in input\n\n");   break;
            }
            if(reward == 1){
                score += reward; // score = score + reward
            }
        }
    }
    return 0;
}


int menu() //main menu that gets called and allows fr user input
{
    int MenuChoice;
    printf("\n");
    printf("Enter 1 for addition\n");
    printf("Enter 2 for Subtraction\n");
    printf("Enter 0 to quit\n");
    printf("-----------------\n");
    printf("Choice: ");
    scanf("%d", &MenuChoice); // user input
    return MenuChoice; //return the choice to choice to select a case
}


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;
    char userselect;
    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);
                if (userselect == a){
                    printf("Congratulations\n\n");
                    *Preward = 1;
                }
                else{
                    printf("incorrect, correct answer is a\n\n");
                 }break;




        case 2: printf("\n%d + %d = ", random1, random2);




            one = (rando1);
            two = (random1+random2);
            three = (rando2);
            printf("\n select from the following letters\n a) %d b) %d  c) %d\n", one, two, three);
            scanf("%c", &userselect);
                if (userselect = b){
                    printf("Congratulations\n\n");
                    *Preward = 1;
                }
                else{
                    printf("incorrect, correct answer is b\n\n");
                }break;


        case 3: printf("\n%d + %d = ", random1, random2);
            one = (rando1);
            two = (rando2);
            three = (random1+random2);
            printf("\n select from the following letters\n a) %d b) %d  c) %d\n", one, two, three);
            scanf("%c", &userselect);
                if (userselect = c){
                    printf("Congratulations\n\n");
                    *Preward = 1;
                }
                else{
                    printf("incorrect, correct answer is c\n\n");
        }break;
        default: printf("error\n"); break;
}
}
                             
void subtraction(int *Preward) // follows same model as previous function, but instead subtraction.
{
    int random1, random2;
    int order;
    int one, two, three;
    int rando1, rando2;
    int a, b, c;
    int userselect;
    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);
    a = 0;
    b = 0;
    c = 0;
    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)l;
                if (userselect = a){
                    printf("Congratulations\n\n");
                    *Preward = 1;
                }
                else{
                    printf("incorrect, correct answer is a\n\n");
        }break;


        case 2: printf("\n%d - %d = ", random1, random2);
            one = (rando1);
            two = (random1-random2);
            three = (rando2);
            printf("\n select from the following letters\n a) %d b) %d  c) %d\n", one, two, three);
            scanf("%c", &userselect);
                if (userselect = b){
                    printf("Congratulations\n\n");
                    *Preward = 1;
                    }
                else{
                    printf("incorrect, correct answer is b\n\n");
        }break;


        case 3: printf("\n%d - %d = ", random1, random2);
            one = (rando1);
            two = (rando2);
            three = (random1-random2);
            printf("\n select from the following letters \na) %d b) %d  c) %d\n", one, two, three);
            scanf("%c", &userselect);
                if (userselect = c){
                    printf("Congratulations\n\n");
                    *Preward = 1;
                    }
                else{
                    printf("incorrect, correct answer is c\n\n");
        }break;
        default: printf("error\n"); break;
}
}

Originally Posted by laserlight

Well, here's the thing: your random problem consists of just two random numbers. From these two numbers, you compute the correct answer. Now, you also need two (plausible) "wrong answers", and then the correct answer and the wrong answers should be in random order.

Instead of trying to account for all the cases, create an array of 3 possible answers. Populate the array with the correct answer and the wrong answers, then shuffle the array. Now, you display the array of possible answers. Whatever answer is selected, check if it is equal to the correct answer. In fact, this part can be used for both the addition and subtraction parts, so you don't need to rewrite code if you place it in a function.

rando1 and rando2 are the plausibles. There are three cases so that a, b and c all get a chance to be the right answer. and they are randomly accessed by the order variable. i am just trying to make letters act as a truth value; a) b) or c) instead of typing in 1) 2) or 3). but when i do letters, there is an infinte loop error or just something else messed up

I see what you did there!! ty soooo much c++ witch! lol i have no idea why i was cramming so much into cases.