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+#include <stdio.h>
+
+/* The C Programming Language, 2nd Edition
+ *
+ * Exercise 1-10: Write a program to copy its input to its output, replacing
+ * each tab by '\t', each backspace by '\b', and each backslash by '\\'. This
+ * makes tabs and backspaces visible in an unambiguous way.
+ *
+ * Answer: Run a loop with getchar() and check its value. When you run into a
+ * tab, backspace, or backslash, just output the two characters and move on.
+ */
+
+int main(void) {
+ char c;
+
+ while ((c = getchar()) != EOF) {
+ if (c == '\t') {
+ printf("\\t");
+ continue;
+ }
+ if (c == '\b') {
+ printf("\\b");
+ continue;
+ }
+ if (c == '\\') {
+ printf("\\\\");
+ continue;
+ }
+ putchar(c);
+ }
+
+ return 0;
+}