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Task/Fibonacci-word/C/fibonacci-word.c

@@ -0,0 +1,97 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+void print_headings()
+{
+	printf("%2s", "N");
+	printf(" %10s", "Length");
+	printf(" %-20s", "Entropy");
+	printf(" %-40s", "Word");
+	printf("\n");
+}
+
+double calculate_entropy(int ones, int zeros)
+{
+	double result = 0;
+	
+	int total = ones + zeros;
+	result -= (double) ones / total * log2((double) ones / total);
+	result -= (double) zeros / total * log2((double) zeros / total);
+	
+	if (result != result) { // NAN
+		result = 0;
+	}
+	
+	return result;
+}
+
+void print_entropy(char *word)
+{
+	int ones = 0;
+	int zeros = 0;
+	
+	int i;
+	for (i = 0; word[i]; i++) {
+		char c = word[i];
+		
+		switch (c) {
+			case '0':
+				zeros++;
+				break;
+			case '1':
+				ones++;
+				break;
+		}
+	}
+	
+	double entropy = calculate_entropy(ones, zeros);
+	printf(" %-20.18f", entropy);
+}
+
+void print_word(int n, char *word)
+{
+	printf("%2d", n);
+	
+	printf(" %10ld", strlen(word));
+	
+	print_entropy(word);
+	
+	if (n < 10) {
+		printf(" %-40s", word);
+	} else {
+		printf(" %-40s", "...");
+	}
+	
+	printf("\n");
+}
+
+int main(int argc, char *argv[])
+{
+	print_headings();
+	
+	char *last_word = malloc(2);
+	strcpy(last_word, "1");
+	
+	char *current_word = malloc(2);
+	strcpy(current_word, "0");
+	
+	print_word(1, last_word);
+	int i;
+	for (i = 2; i <= 37; i++) {
+		print_word(i, current_word);
+		
+		char *next_word = malloc(strlen(current_word) + strlen(last_word) + 1);
+		strcpy(next_word, current_word);
+		strcat(next_word, last_word);
+		
+		free(last_word);
+		last_word = current_word;
+		current_word = next_word;
+	}
+	
+	free(last_word);
+	free(current_word);
+	return 0;
+}