q1 answered

answers/q1.cpp

@@ -0,0 +1,38 @@
+//1. Print Hello world! in reverse
+
+#include <iostream>
+
+using namespace std;
+
+string wordReverse(string str)
+{
+    int i = str.length() - 1;
+    int start, end = i + 1;
+    string result = "";
+
+    while (i >= 0) {
+        if (str[i] == ' ') {
+            start = i + 1;
+            while (start != end)
+                result += str[start++];
+
+            result += ' ';
+
+            end = i;
+        }
+        i--;
+    }
+    start = 0;
+    while (start != end)
+        result += str[start++];
+
+    return result;
+}
+int main()
+{
+    string str = "Hello World";
+
+    cout << wordReverse(str);
+
+    return 0;
+}