ex1-9 ex1-10

4 files changed, 61 insertions, 2 deletions

diff --git a/ex1-10.c b/ex1-10.c
new file mode 100644
index 0000000..0b0c018
--- /dev/null
+++ b/ex1-10.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+/* Track whether we are inside or outside a word */
+typedef enum _state {IN,OUT} state;
+
+/* true if c is a 'word' character (not a blank, space, or a tab)  */
+bool is_word(char c) {
+    return c != ' ' && c != '\t' && c != '\n';
+}
+
+/* Counts characters, lines, and words from stdin. 
+
+   'characters' are single byte characters. No handling for encodings in c standard lib.
+   'lines' are newline characters.
+   'words' are contiguous sequences of characters  other than space, tab, newline */
+int main(void) {
+    int c;
+    state s = OUT;
+    uint32_t cc = 0, lc = 0, wc = 0;
+    while ((c = getchar()) !=  EOF) {
+        cc++;
+        if (c == '\n') {
+            lc++;
+        }
+        if (!is_word(c)) {
+            s = OUT;
+        } else if (s == OUT) {
+            s = IN;
+            wc++;
+        }
+    }
+    printf("cc=%d lc=%d wc=%d\n", cc, lc, wc);
+    return 0;
+}
\ No newline at end of file
diff --git a/ex1-8.c b/ex1-8.c
index b692948..cc70b64 100644
--- a/ex1-8.c
+++ b/ex1-8.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdint.h>
 
 int main(void) {
   int c;
@@ -14,4 +15,4 @@ int main(void) {
   }
   printf("nl=%ld tb=%ld bl=%ld\n", nl, tb, bl);
   return 0;
-}
\ No newline at end of file
+}
diff --git a/ex1-9.c b/ex1-9.c
new file mode 100644
index 0000000..e7d4d25
--- /dev/null
+++ b/ex1-9.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdbool.h>
+/* Copy stdin to stdout, replacing consecutive spaces with a single space
+   Edge case: a leading space is retained if there are leading spaces.
+   Edge case: an empty file just doesn't echo anything, but emits a warning on stderr */
+int main(void) {
+  int c = getchar();
+  if (c == EOF) {
+    fprintf(stderr, "warning: no input\n");
+    goto exit;
+  }
+  putchar(c);
+  bool bl = (c == ' ');
+  while ((c = getchar()) != EOF) {
+    if ((!bl) || (c != ' ')) {
+        putchar(c);
+    }
+    bl = (c == ' ');
+  }
+exit:
+  return 0;
+}
\ No newline at end of file
diff --git a/run b/run
index 185f869..11c2851 100755
--- a/run
+++ b/run
@@ -4,4 +4,4 @@ cc -o exe $@
 ./exe
 result=$?
 rm exe
-exit $result
\ No newline at end of file
+exit $result