Question

Write method reverseString, which takes a string str and returns a new string with the characters in str in reverse order. For example, reverseString("ABCDE") should return "EDCBA".

Complete the reverseString method below by assigning the reversed string to result.

/** Takes a string str and returns a new string

* with the characters reversed.

*/

public static String reverseString(String str)

{

String result = "";

return result;

}

Answer 1

Answer:

The method written in Java is as follows:

public static String reverseString(String str){

    String result = "";

    int lentt = str.length();

    char[] strArray = str.toCharArray();

       for (int i = lentt - 1; i >= 0; i--)

           result+=strArray[i];

    return result;

}

Explanation:

This defines the method

public static String reverseString(String str){

This initializes the result of the reversed string to an empty string

    String result = "";

This calculates the length of the string

    int lentt = str.length();

This converts the string to a char array

    char[] strArray = str.toCharArray();

This iterates through the char array

       for (int i = lentt - 1; i >= 0; i--)

This gets the reversed string

           result+=strArray[i];

This returns the reversed string            

    return result;

}

See attachment for full program that includes the main method

Answer 2

def reverseString(str):

   y = str[::-1]

   return y

print(reverseString("ABCDE"))

The code is written in python. A function name reverseString is declared. The function takes an argument str.

Then a variable named y is used to store the reverse of our argument string.  

The keyword return is used to output the reversed string.

Finally, the function is called with a print statement.

The bolded portion of the code are keywords in python.

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