Question

include #include using namespace std; int main() { const in SIZE = 20; char userInput[SIZE]; cout <<… # (Assume the user enters George Washington.) #include #include using namespace std; int main() { const in SIZE = 20; char userInput[SIZE]; cout << "What is your name? "; cin.getline(userInput, SIZE); cout << "Hello " << userInput << endl; return 0; }

Short answer

Answer: The main purpose of the given C++ code is to take the user's input, store it in a character array, and then print out a greeting message using the stored input. The code covers the concepts of arrays, user input, and basic output in C++.

Step-by-step solution

Understand the C++ code headers and main

The code starts with including necessary libraries (iostream and iomanip), and using the standard (std) namespace. This is necessary for using functions like cout and cin. The main() function is where our program execution starts.

Declare variables and constants

Inside the main() function, we declare a constant integer SIZE with a value of 20. It is used to determine the size of the character array userInput[]. The userInput array is declared with the size of SIZE, which is 20. This means the userInput variable stores up to 20 characters, including null character ('\0') at the end.

Ask for the user's input

The code uses cout to print "What is your name? " on the screen. This prompts users to input their name. No newline character is added here so that the input appears on the same line as the question.

Store user's input

The function cin.getline() takes two arguments: the name of the character array (userInput) and the maximum number of characters to store (SIZE). It reads the user's input, including spaces, and stores it character by character into the userInput[] array. It stops taking input after SIZE-1 characters, or when a '\n' character (representing Enter key) is entered. It automatically adds a null character '\0' at the end of the input string.

Print the greeting message

The code uses cout to output "Hello " followed by the userInput string, and a newline character at the end. This forms the final greeting, for example: "Hello George Washington\n" if George Washington was the input.

Return 0 and end the program

The main() function returns 0, indicating a successful execution of the code. Then the program ends.