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sources/c/star rating/assignment.toml

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+name = "Star Rating"
+given-date = "30/10/2022"
+main-file = "star_rating.c"
+description = "A program that takes 21 reviews and calculates the average rating and prints some stars"
+directions = """
+1. Read in 21 user ratings for a movie.
+Each rating is a number from 1 to 5 stars.
+Store the ratings in an array.
+
+2. Calculate the average rating. Print this
+to the screen rounded to 1 decimal point, e.g.
+4.1 stars.
+
+3. Create a new array called ‘rating_frequency’
+that stores the number of ratings for
+each star, e.g. 3 one-star ratings, 5
+two-star ratings, etc.
+
+4. Display the ratings' frequency to the screen,
+where an asterisk (* symbol) is printed out for
+the number of movie ratings of that star
+number. See screenshot.
+
+5. Create a new array ‘rating_percent’ that
+contains the percentage of ratings for each
+star, e.g. 14.3% one star, 23.8% two star, etc.
+Display this to the screen in a similar manner
+to task 4.
+"""

sources/c/star rating/star_rating.c

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+#include <stdio.h>
+
+int main() {
+    int ratings[21];
+    int rating_frequency[] = {0, 0, 0, 0, 0};
+    int rating_percent[] = {0, 0, 0, 0, 0};
+    int total_stars = 0;
+
+    for (int i = 0; i < 21; i++) {
+        printf("Review number %i, enter rating (1 to 5): ", i+1);
+        // read the input as int
+        scanf("%i", &ratings[i]);
+
+        int rating = ratings[i];
+
+        if (rating < 1 || rating > 5) {
+            fprintf(stderr, "Invalid rating! Ratings must be between 1 and 5.\n");
+            return 1;
+        }
+
+        // increment the star count for the stars
+        // (-1 is because indexes start from 0)
+        ++rating_frequency[rating-1];
+        total_stars += rating;
+    }
+
+    float average = (float) total_stars / 21;
+    printf("\nAverage rating: %.1f\n\n", average);
+
+    for (int star_count_i = 0; star_count_i < 5; star_count_i++) {
+        printf("%i star: ", star_count_i+1);
+
+        for (int i = 0; i < rating_frequency[star_count_i]; i++)
+            printf("*");
+
+        printf("\n");
+    }
+
+    printf("\n");
+
+    for (int star_count_i = 0; star_count_i < 5; star_count_i++) {
+        float star_count_percent = ((float) rating_frequency[star_count_i] / 21) * 100;
+        printf("%i star percentage: %.1f%\n", star_count_i+1, star_count_percent);
+    }
+
+    return 0;
+}