first commit

1 files changed, 35 insertions, 0 deletions

diff --git a/ch01/ex11-wc.c b/ch01/ex11-wc.c
new file mode 100644
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--- /dev/null
+++ b/ch01/ex11-wc.c
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+#include <stdio.h>
+
+#define IN  1    /* inside a word */
+#define OUT 0    /* outside a word */
+
+/* count lines, words, and characters in input
+ *
+ * I would focus on testing the state transitions, since character and
+ * line counting are straightforward. The character count increments for
+ * every character that is not EOF, and the line count increments whenever
+ * a newline is encountered. Word counting is more complex because it
+ * depends on correctly detecting boundaries. I would include test cases
+ * with varying numbers of spaces, tabs, and newlines to verify that word
+ * boundaries are handled correctly, since those inputs are the most likely
+ * to reveal bugs.
+ */
+int main()
+{
+	int c, nl, nw, nc, state;
+
+	state = OUT;
+	nl = nw = nc = 0;
+	while ((c = getchar()) != EOF) {
+		nc++;
+		if (c == '\n')
+			++nl;
+		if (c == ' ' || c == '\n' || c == '\t')
+			state = OUT;
+		else if (state == OUT) {
+			state = IN;
+			++nw;
+		}
+	}
+	printf("%d %d %d\n", nl, nw, nc);
+}