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+#include <stdio.h>
+
+/* The C Programming Language, 2nd Edition
+ *
+ * Exercise 1-9: Write a program to copy its input to its output, replacing each
+ * string of one or more blanks by a single blank.
+ *
+ * Answer: Run a loop with getchar() and check its value. If it's a space, count
+ * it, but prevent further spaces from being printed. Anything else should
+ * simply be spat out.
+ */
+
+int main(void) {
+ char c;
+ int spaces = 0;
+
+ while ((c = getchar()) != EOF) {
+ if (c == ' ' && spaces == 0) {
+ putchar(c);
+ spaces++;
+ } else {
+ putchar(c);
+ }
+ }
+
+ return 0;
+}