11: Reverse a string.

⏳⌚ 00:00:00

Steps to solve:-

1. Input Reading:- The program starts by declaring a string variable str. It uses cin to read a string input from the user and stores it in the str variable. The user enters a string, and that string becomes the value of str.
2. String Length Calculation:- After reading the input string, the code calculates the length of the string using the length() function and stores it in the integer variable n. This step is necessary to determine the length of the string, which is needed for iterating over its characters.
3. Reversing the String:- The code enters a while loop with the condition i < j, where i starts at 0 and j starts at n - 1. These two pointers (i and j) are used to swap characters in the string to reverse it. Inside the loop, the swap function is used to swap the characters at positions i and j in the string str. This effectively reverses the characters at these positions. After the swap, i is incremented by 1, and j is decremented by 1, bringing the pointers closer to each other for the next iteration.
4. Exiting the Loop:- The loop continues until i is no longer less than j. When i becomes equal to or greater than j, the loop exits because there are no more characters to swap.
5. Printing the Reversed String:-Finally, the code prints the reversed string using cout.