adding word count example

chapter-01/3.0-word-count/Makefile

@@ -0,0 +1,2 @@
+all:
+	gcc -o word-count.x86_64 main.c

chapter-01/3.0-word-count/main.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+#define IN  1
+#define OUT 0
+
+/* count lines, words, and characters in user input */
+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("number of lines: %d\n", nl);
+    printf("number of words: %d\n", nw);
+    printf("number of chars: %d\n", nc);
+}