add exercise 1-13: vertical version of histogram

1 files changed, 66 insertions, 0 deletions

diff --git a/ch01/ex13-vhistogram.c b/ch01/ex13-vhistogram.c
new file mode 100644
index 0000000..9182500
--- /dev/null
+++ b/ch01/ex13-vhistogram.c
@@ -0,0 +1,66 @@
+#include <stdio.h>
+
+#define IN  1    /* inside a word */
+#define OUT 0    /* outside a word */
+
+#define INDICATOR_BAR   '#'
+#define INDICATOR_EMPTY ' '
+
+/* print a vertical histogram of word lengths */
+int main()
+{
+	int c, i, j, k, nc, state;
+	int nlen[10];
+	int maxlen;
+
+	for (i = 0; i < 10; ++i)
+		nlen[i] = 0;
+
+	maxlen = nc = 0;
+	state = OUT;
+	while ((c = getchar()) != EOF) {
+		if (c == ' ' || c == '\n' || c == '\t') {
+			if (state == IN) {
+				i = nc - 1;
+				if (i > 9)
+					i = 9;
+				++nlen[i];
+				nc = 0;
+			}
+			state = OUT;
+		} else if (state == OUT)
+			state = IN;
+		if (state == IN)
+			++nc;
+	}
+
+	if (state == IN) {
+		i = nc - 1;
+		if (i > 9)
+			i = 9;
+		++nlen[i];
+		nc = 0;
+	}
+
+	for (i = 0; i < 10; ++i)
+		if (nlen[i] > maxlen)
+			maxlen = nlen[i];
+
+	for (i = 0; i < maxlen; ++i) {
+		for (j = 0; j < 10; ++j) {
+			k = maxlen - i - 1;
+			if (k < nlen[j])
+				printf("%3c", INDICATOR_BAR);
+			else
+				printf("%3c", INDICATOR_EMPTY);
+		}
+		putchar('\n');
+	}
+
+	for (i = 0; i < 10; ++i)
+		if (i == 9)
+			printf(" >9");
+		else
+			printf("%3d", i + 1);
+	putchar('\n');
+}