Prata artishoks

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define APRICE 2.05
#define BPRICE 1.15
#define CPRICE 1.09
#define DISCOUNT 0.05
#define DELIV1 6.50
#define DELIV2 14.00

//проблема - дважды печатает запрос выбора абся
int main()
{
     char ch;
     int flag = 1;
     float a,b,c, temp;//
     float total_weight, total_price, disc_price, deliv, final_price;
     a = b = c = temp = 0.0;
     printf("artishoks a\t");
     printf("beetroot b\t");
     printf("carrots c\t");
     printf("quit q\n");
     scanf("%c",&ch);
     //scanf("%*[\n]");

     while( ch!='q' )
     {
        switch(ch)
        {
        case 'a':
            {
                printf("How much of artishoks you want?\n");
                scanf("%f",&temp);
                a+=temp;
            }
            break;
        case 'b':
            {
                printf("How much of beetroot you want?\n");
                scanf("%f",&temp);
                b+=temp;

            }
            break;
        case 'c':
            {
                printf("How much of carrots you want?\n");
                scanf("%f",&temp);
                c+=temp;

            }
            break;
        //default:
            //printf("wrong choise, try again\n");


        }//end of switch
        //scanf("%*[\n]");
        printf("chose a,b,c,or q now\n");
        scanf("%c",&ch);
        if(ch=='\n')
        scanf("%*[\n]");

     }//end of while

     printf("you ask for %f art, %f bee, %f car\n",a,b,c);

     total_price = a*APRICE + b*BPRICE + c*CPRICE;

     if(total_price>=100.0)
        disc_price = total_price*(1.0-DISCOUNT);
     else
        disc_price = total_price;

    total_weight = a+b+c;//delivery price
    if(total_weight<=5.0)
        deliv = DELIV1;
    else if(total_weight<=20.0)
        deliv = DELIV2;
    else
        deliv = DELIV2+(total_weight-20.0)*0.5;

        final_price = disc_price+ deliv;

        printf("total weight is %f, total price is %f, deliv is %f\n",total_weight,total_price,deliv);
        printf("disc price is %f\n",disc_price);
        printf("final price is %f\n",final_price);
        printf("delivery is %f",deliv);


     return 0;
}