initial commit

Author: fsaadatmand

chapter01/1-14a.c

@@ -0,0 +1,64 @@
+/*
+ * Exercise 1-14. Write a program to print a histogram of the frequencies of
+ * different characters in its input.
+ *
+ * By Faisal Saadatmand
+ */
+
+/* Vertical Histogram. See 1-14.c for a horizontal histogram implementation */
+
+#include <stdio.h>
+
+#define SIZE 93 /* size of characters array */
+#define SCALE 1 /* adjust to accommodate large input */
+
+int main(void)
+{
+	int c, i, count, longestBar;
+	int characters[SIZE];
+
+	/* initialize elements' values to 0 */
+	for (i = 0; i < SIZE; ++i)
+		characters[i] = 0;
+
+	count = 0;
+	while ((c = getchar()) != EOF) 
+		/* match graphical characters only (ASCII table) */
+		if (c >= '!' && c <= '~') {
+			++characters[c - '!'];
+			++count; /* number of matched characters */
+		}
+
+	if (!count)
+		return -1;
+
+	printf("\nVertical Histogram:\n");
+
+	/* find the longestBar */
+	longestBar = 0;
+	for (i = 0; i < SIZE; ++i)
+		if (characters[i] > longestBar)
+			longestBar = characters[i];
+	longestBar /= SCALE;
+
+	/* print vertical histogram  */
+	while (longestBar > 0) {
+		for (i = 0; i < SIZE; ++i)
+			if (characters[i] != 0) { /* skip if no data */
+				if (characters[i] / SCALE < longestBar)
+					printf(" %c", ' ');
+				else
+					printf(" %c", '*');
+			}
+		printf("\n");
+		--longestBar;
+	}
+
+	/* print labels */
+	for (i = 0; i < SIZE; ++i)
+		if (characters[i] != 0) /* skip if no data */
+			printf (" %c", i + '!');
+	printf("\n");
+
+	return 0;
+}