twelfth exercise

1-12.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+#define IN   1  /* inside a word */
+#define OUT  0  /* outside a word */
+
+int main(){
+  int c, state;
+  state = OUT;
+  while ((c = getchar()) != EOF) {
+    if (c == ' ' || c == '\n' || c == '\t'){
+      state = OUT;
+      putchar('\n');
+    }
+    else if (state == OUT) {
+      state = IN;
+      putchar(c);
+    }
+  }
+  return 0;
+}