Solved: 17 - Pointer Arithmetic

modules/05_pointers_and_references/src/pointer_arithmetic.cpp

@@ -2,8 +2,24 @@
 
 namespace pointers {
 
-auto pointer_distance(const int* begin, const int* end) -> std::size_t { (void)begin; (void)end; return 0; }
-auto find_pointer(const int* begin, const int* end, int target) -> const int* { (void)begin; (void)end; (void)target; return end; }
-void reverse_in_place(int* begin, int* end) { (void)begin; (void)end; }
+auto pointer_distance(const int* begin, const int* end) -> std::size_t {
+    return end - begin;
+}
+
+auto find_pointer(const int* begin, const int* end, int target) -> const int* {
+    while (*begin != target && ++begin != end) {
+        if (*begin == target) return begin;
+        begin++;
+    }
+    return begin;
+}
+
+void reverse_in_place(int* begin, int* end) {
+    while (begin != end && begin != --end) {
+        const auto aux = *begin;
+        *begin++ = *end;
+        *end = aux;
+    }
+}
 
 }  // namespace pointers