1 files changed, 22 insertions, 0 deletions

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