Switch case inside loop (for or while) in C

Question

I want to ask the user how many tickets he wants to buy and then have a loop that will specify what type of ticket he wants. Each kind of ticket has a different value and I want to calculate the total sum of the tickets. The problem is that for some reason it iterates in a weird way. Why is that? I tried with a for loop as well and an array of chars but the results were the same. What am I missing here?

#include <stdio.h>
#include <stdbool.h>

int main()
{
   int n,i;
   printf("How many tickets would you like?\n");
   scanf("%d", &n);
   char c;
   float sum = 0;
   while(n)
   {
       printf("What type of ticket do you want?\n");
       scanf("%c",&c);
       switch (c)
       {
        case ('E'):
            {
            sum +=0.23;
            break;
            }
        case('A'):
            {
              sum+=0.7;
            break;
            }
        case('T'):
            {
            sum+=0.15;
            break;
            }
        }
        n--;
   }
   printf("Sum is: %f", sum);
   return 0;
}