Write a C++ function named dup that makes a copy of a user input C-string and repeats the C-string. For example, if the user inputs "HelloWorld" then it will say "HelloWorldHelloWorld"Dynamically allocate memory *(using new)* for a new C-string large enough to hold the result C-string. It should be the minimum size necessary to store the result C-string. Don't forget room for a null character! Put the result C-string into the newly allocated memory. It must be a valid, NULL-terminated C-string.Return a pointer to the result string.The function can assume that parameter str points to a valid, NULL-terminated C-string. You can use cstring utility functions like strcpy(), strlen(), etc. if you wish, but you are not required to. Please demonstrate calling this function. Example: dup("Giants")should return a pointer to a newly-allocated, null-terminated C-string: "GiantsGiants"char* dup(char *str)

Need to provide c++ code to implement a function named dup that makes a copy of a user input C-string and repeats the C-string.#include <iostream> #include <cstring> using namespace std; char* dup(char *str) { // Calculate the length of the input string int len = strlen(str); // Dynamically allocate memory for the new C-string char* result = new char[len * 2 + 1]; // Double the length of input string + 1 for null character // Copy the input string and repeat it in the result string for (int i = 0; i < len; i++) { result[i] = str[i]; result[i + len] = str[i]; // Repeat the input string } // Add null character at the end to make it a valid C-string result[len * 2] = '\0'; return result; } int main() { // Take input from user cout << "Enter a string: "; char input[100]; cin.getline(input, 100); // Call dup function and store result char* result = dup(input); // Print the duplicated string cout << "Duplicated string: " << result << endl; // Remember to free the dynamically allocated memory to avoid memory leaks delete[] result; return 0; }The required sample output is :

Answered: Write a C++ function named dup that…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Write a C++ function named dup that makes a copy of a user input C-string and repeats the C-string. For example, if the user inputs "HelloWorld" then it will say "HelloWorldHelloWorld"

Dynamically allocate memory *(using new)* for a new C-string large enough to hold the result C-string. It should be the minimum size necessary to store the result C-string. Don't forget room for a null character!
Put the result C-string into the newly allocated memory. It must be a valid, NULL-terminated C-string.
Return a pointer to the result string.

The function can assume that parameter str points to a valid, NULL-terminated C-string. You can use cstring utility functions like strcpy(), strlen(), etc. if you wish, but you are not required to. Please demonstrate calling this function.

Example: dup("Giants")should return a pointer to a newly-allocated, null-terminated C-string: "GiantsGiants"

char* dup(char *str)

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