feat: 5-4

chapter-5/5-4.c

@@ -0,0 +1,30 @@
+/* Exercise 5-4. Write the function strend(s,t), which returns 1 if the string t
+ * occurs at the end of the string s, and zero otherwise.  */
+
+#include <stdio.h>
+
+int strend(char *ab, char *b) {
+  // needle does the search
+  char *needle = b;
+
+  // as long as we don't reach the end of ab
+  while (*ab) {
+    // check if they match, and move to next char
+    if (*ab++ != *needle++) {
+      // reset needle each time they don't match
+      needle = b;
+    }
+  }
+  // are they both '\0'
+  return *ab == *needle;
+}
+
+int main() {
+  char *ab = "Hello K&R!";
+  char *b = "K&R!";
+  char *c = "Boo!";
+
+  printf("Does %s end with %s? %d\n", ab, b, strend(ab, b));
+  printf("Does %s end with %s? %d\n", ab, c, strend(ab, c));
+  return 0;
+}