added weekly exercises of isp-ws25

c/isp-ws25/weeklies/week09/w09ex03.c

@@ -0,0 +1,136 @@
+/*
+In this task, you should get familiar with enum.
+The program allows the user to enter ratings for a movie
+using integers that should correspond to an enum.
+Only ratings between 1 and 5 are considered.
+
+The program processes the ratings,
+prints the average rating using stars (i.e., *) and
+prints a recommendation based on the average ratings.
+
+Your task is:
+
+- Declare a typedef’d enum for the 5 categories of the rating system
+  - 1 == worst rating
+  - 5 == best rating
+- all ratings are entered by the user
+- calculate average rating using total_ratings and weighted_ratings
+  - total_ratings == total number of ratings entered by the user
+  - weighted_ratings == ratings weighted by their category
+    - ratings in 1st category: weighted with 1
+    - ratings in 2nd category: weighted with 3
+
+This is necessary to calculate the average rating by dividing weighted_ratings by total_ratings
+Use your typedef’d enum as data type of the variable in which you store the average ratings
+Use an integer division to calculate the average rating
+(e.g., an average rating of 3.84 corresponds to the 3rd category).
+
+Print the average rating using stars.
+For instance, if the average rating of the movie is in the
+3rd category of the rating system, then print Average rating: ***.
+
+Print a recommendation based on the rating category of the movie’s average rating:
+- 1st category: The movie is terrible, do not watch it
+- 2nd category: The movie is bad and not worth watching
+- 3rd category: The movie is average, neither especially good nor bad
+- 4th category: The movie is good and worth watching
+- 5th category: The movie is excellent and a must-see
+- Print "Invalid rating for the movie" if none of the above cases apply.
+
+
+Examples:
+
+Enter movie ratings (1 = TERRIBLE, 2 = BAD, 3 = AVERAGE, 4 = GOOD, 5 = EXCELLENT). End with -1:
+3 4 3 3 2 3 5 4 4 3 3 -1
+Average rating: ***
+Recommendation: The movie is average, neither especially good nor bad
+
+
+Enter movie ratings (1 = TERRIBLE, 2 = BAD, 3 = AVERAGE, 4 = GOOD, 5 = EXCELLENT). End with -1:
+5 4 3 4 5 4 3 4 5 4 3 5 5 5 5 5 3 3 3 -1
+Average rating: ****
+Recommendation: The movie is good and worth watching
+*/
+
+#include <stdio.h>
+
+#define MAX_RATING 5
+
+// TODO: Declare a (typedef'd) enum for a movie rating scale that consists of 5 categories
+
+typedef enum _Ratings_ {
+  TERRIBLE = 1,
+  BAD,
+  AVERAGE,
+  GOOD,
+  EXCELLENT
+} Ratings;
+
+void giveRecommendation(Ratings rating)
+{
+  printf("Recommendation: ");
+  switch (rating) {
+    case TERRIBLE:
+      printf("The movie is terrible, do not watch it\n");
+      break;
+    case BAD:
+      printf("The movie is bad and not worth watching\n");
+      break;
+    case AVERAGE:
+      printf("The movie is average, neither especially good nor bad\n");
+      break;
+    case GOOD:
+      printf("The movie is good and worth watching\n");
+      break;
+    case EXCELLENT:
+      printf("The movie is excellent and a must-see\n");
+      break;
+    default:
+      printf("Invalid rating for the movie\n");
+      break;
+  }
+}
+
+int main(void)
+{
+  printf("Enter movie ratings (1 = TERRIBLE, 2 = BAD, 3 = AVERAGE, 4 = GOOD, 5 = EXCELLENT). End with -1:\n");
+
+  int input = 0;
+  int ratings[MAX_RATING] = {0};
+  while (1)
+  {
+    scanf("%d", &input);
+    if (input == -1) break;
+
+    if (input > 0 && input <= MAX_RATING)
+    {
+      ratings[--input]++;
+    }
+  }
+
+  int total_ratings = 0;
+  int weighted_ratings = 0;
+  for (int i = 0; i < sizeof(ratings)/sizeof(ratings[0]); i++)
+  {
+    total_ratings += ratings[i];
+    weighted_ratings += (ratings[i] * (i+1));
+  }
+	
+  if (total_ratings == 0)
+  {
+    printf("No ratings entered\n");
+    return 1;
+  }
+  // TODO: Store the average rating in a variable. The data type of the variable should be your typedef'd enum
+  Ratings average_rating = weighted_ratings / total_ratings;
+
+  // TODO: Print the average rating by displaying stars
+  printf("Average rating: ");
+  for(int i = 0; i < average_rating; i++) printf("%c", '*');
+  printf("\n");
+
+  // TODO: Print the recommendation
+  giveRecommendation(average_rating);
+
+  return 0;
+}